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Location:
Brisbane
Registered:
July 2003
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7MGTE - Temperature go up, temperature go down.
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Tue, 18 November 2003 08:26
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Hey guys,
Picked up the new car today and the temperature guage is all over the shop, sometimes it just sits on full cold, then it'll jump to normal, then jump all the way to hot, and anywhere inbetween. Car was running fine, not missing, nothing, it wasn't overheating, just that the temp guage is all over the place.
Could it be a temp sensor?
Where is the temp sensor?
Anything at all?
Cheers
Paul
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Location:
Brisbane
Registered:
May 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Tue, 18 November 2003 09:29
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Air in the cooling system. You need to "burp" it as per the factory manual.
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Location:
Brisbane
Registered:
February 2003
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Re: 7MGTE - Temperature go up, temperature go down.
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Tue, 18 November 2003 11:01
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would someone be able to post up the procedure? as i'm sure ViNcEnXo doesn't have a factory manual 
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Location:
Adelaide
Registered:
June 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Tue, 18 November 2003 11:33
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| 4AGESprinter wrote on Tue, 18 November 2003 21:31 |
would someone be able to post up the procedure? as i'm sure ViNcEnXo doesn't have a factory manual
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Park it with the nose pointing uphill, take the rad cap off and let it idle. All the air pockets should make their way to the radiator. I guess you can stop when the bubbles stop?
Perhaps someone can add to this?
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I Supported Toymods
Location:
melbourne.vic.au
Registered:
May 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Tue, 18 November 2003 11:36
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Oh... And you may want to add some water to the radiator as it burps away...
Cheers.
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Registered:
August 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Tue, 18 November 2003 12:09
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How about you take the time to flush the system
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Location:
Brisbane
Registered:
July 2003
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Re: 7MGTE - Temperature go up, temperature go down.
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Tue, 18 November 2003 13:17
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Thanks for the help guys!
I'll get on that first thing in the morning!
The connector for the temp sensor is broken, but jiggling that isn't making any difference.
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Location:
Brisbane
Registered:
June 2003
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Re: 7MGTE - Temperature go up, temperature go down.
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Tue, 18 November 2003 13:20
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easiest way is:
1 Start car
2 Remove radiator cap
3 watch the coolant raising bubbles in the neck where u can see the water
4 Let the car run with the cap off until all the bubbles stop..it should take a few minutes.
5 Put the cap back on
6 Hopefully that has fixed your problem!
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Location:
Brisbane
Registered:
May 2002
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Location:
Brisbane
Registered:
July 2003
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Re: 7MGTE - Temperature go up, temperature go down.
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Tue, 18 November 2003 14:03
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Great...
I'll get this done asap.
Is it worth using the Toyota Red coolant?
Cheers
Paul
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Location:
Central Coast, NSW
Registered:
May 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Tue, 18 November 2003 21:58
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YES use the Toyota red coolant.... you're silly if you run anything else. Completely flush your whole system clean and then fill it with the red goods.
Just to let you know I had EXACTLY the same problem with my car... i think the digital gauge died because i flushed the system at least three times trying to fix it to no avail. I simply just bought an aftermarket water temp gauge and mounted it under my dash! now i know exactly how hot it is at all times
by the way, what would an optimal operating temperature for a 7M be? mine always seems to run between 80-90 degrees celsius
Dan
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Location:
Brisbane
Registered:
May 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Tue, 18 November 2003 22:59
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Toyota red coolant is pretty much the best stuff out there. I won't use anything else in my cars.
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Location:
Brisbane
Registered:
July 2003
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 00:25
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Do I need to take it anywhere to do a flush? Or can I do it myself? And I'm guessing Toyota is the place to get the red coolant?
Cheers
Paul
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Location:
Brisbane
Registered:
July 2003
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 00:25
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And 80-90 degrees is pretty normal for most cars, 90 is starting to get a little on the warm side but nothing to be concerned about.
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 01:50
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my corolla runs at 72% most of the time.  no turbo though.
i have never heard of this red coolant. anyone know approximate price? suitable for all cars?
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Location:
Brisbane
Registered:
July 2003
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 03:04
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From what I've heard the red coolant is the best you can get.
I just went and bought 4 Litres.... Cost me $34. Small price to pay for a vital part of you car.
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Location:
tas
Registered:
June 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 05:20
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My temp gage has been wacko since i got the car, one minute it's cold, next minute it's up the top, back down, back up, back down etc.
So after reading this thread i whent and burped my cooling system. Drove the supra up on ramps, start the engine with the radiator cap off and let it warm up. Then i turned my heater on full bore. Finally 4 bubbles pop out (smallish ones) so i guess that wasn't much of a problem, and my heater never even got hot, i don't think it's ever worked. Also noted my AC doesn't come out very cold, just normal air comes thru. bugger!
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 05:30
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Dingaling,
From the desription of your problem I'd suggest you climate control box is faulty. Mine was the same, we checked the heater valve, checked the air-con, etc etc, even checked the climate control box with a multi meter and looked OK. Swapped it over for a different one, suddenly everythings working again. I've heard this happen to a few other people as well
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Location:
Brisbane
Registered:
July 2003
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 05:34
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My climate control is working fine except when I turn the temperature up. Then nothing at all happens, no air, no heat, nothing.
I thought that was odd.
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Location:
Brisbane
Registered:
July 2003
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 06:28
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Where on the standard digital guage do the cars normally sit?
Cheers
Paul
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Registered:
August 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 07:41
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Smack bang in the middle one would hope.
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Location:
Camden, NSW
Registered:
June 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 09:00
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i flushed my system today, runs fine now, temp guage stays the same at the normal position  my guess is steam was playing tricks with the sensor
Neway ive put some of that anti rust stuff in the system and will flush the system again on fri to see what happens but it seems that my problem is fixed
Cheers for the help guys, i knew i could count on you
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Location:
Brisbane
Registered:
May 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 10:22
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By "anti rust stuff" I hope you mean Toyota red coolant?
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Location:
tas
Registered:
June 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 13:02
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thanx for the tip lumpy, i hope a climate box isn;t expensive, how do you get to it? behind the dash?
Norbie, my supra has green crap in it for coolant, it's been that way for 4 months since i got the car. I hope the previous owner knew what he was doing and buaght a compatible coolant?
i'll get the toyota red stuff tommorow! (by the way how do I get distilled water to mix with the coolant? or just use normal tap water?)
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Location:
Sydney
Registered:
February 2003
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 13:05
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no use distilled water not tap water...
u can buy it from hardware stores, or even BIG W probably
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Location:
Brisbane
Registered:
May 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 13:06
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Tap water isn't so bad if you're using it to dilute coolant, but distilled water is definitely better.
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Registered:
August 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 13:08
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The can't be assed factor heavily influences my decision when opting to use the conveniently close by tap water.
I cant beleive you use distilled water for a 5me!
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Location:
tas
Registered:
June 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 13:16
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thanx for the heads up, i'll get the distilled stuff, i hear you can make it yourself if you boil water and catch the evaporated steam, but hell that would take a looong time.
this is offtopic, but anyway... i just whent for a ride in a 2002 Mercedes Kompressor (e-class i think it was), dam sweet car! smooth german goodness, anyway the driver just had to show it off, and so he floored it, not bad gets up and goes quite effortlessly. But i really offended him when i said "my supra feels twice as fast as that". Altho it's impressive for a 4 cylinder. Those cars sure pick up some attention from the public, i felt like a rich snobby bastard bieng in that car.
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Location:
Camden, NSW
Registered:
June 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 21:19
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na the anti rust stuff gets rid of the rust in the radiator, it dilutes it or something n it just drains out? The toyota red coolant goes in tomorrow when i re-flush the system so its really nice and clean
Whats so good about the toyota red stuff? is it that much diff to joe bloggs brand green stuff? (i take it it is)
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Location:
c'town, NSW
Registered:
May 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 21:28
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toyota have specifically made the red stuff to suit the type metal they use in the block and head.
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Wed, 19 November 2003 22:08
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The climate control box I'm talking about is the one with all the buttons and temperature slider on it in the dash. For some reason they fail and no matter where you put the slider it doesn't change temperature (ie turn air-con or heater valve on). I got one when I did my conversion (from my jza-70 front cut). Not sure where else you'd find one - perhaps the guy wrecking an ma70 in the parts for sale section?
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Location:
Brisbane
Registered:
July 2003
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Location:
Sydney
Registered:
February 2003
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Re: 7MGTE - Temperature go up, temperature go down.
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Thu, 20 November 2003 01:02
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glen--->
haha no i was lazy and used premix crap, i wouldnt really care about tap water for the 5m tho
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Location:
Brisbane
Registered:
July 2003
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Re: 7MGTE - Temperature go up, temperature go down.
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Thu, 20 November 2003 11:22
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Oh well.
Turns out it was a Blown headgasket.
I could cry.
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Thu, 20 November 2003 21:50
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This is a good of example of Ockam's Razor - the simplest explanation is the most probable one.
In the case of the 7m, overheating and temperature fluctuations = blown headgasket!
Sorry to hear that, I hope it's still under some form of warranty. 
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Location:
Melbourne
Registered:
May 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Fri, 21 November 2003 01:02
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| ViNcEnXo wrote on Thu, 20 November 2003 22:22 |
Oh well.
Turns out it was a Blown headgasket.
I could cry.
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ARP studs, surface head and clean the block as good as possable and put a new toyota gasket in
Smile again!
Allan
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I supported Toymods
Location:
Central Coast
Registered:
May 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Fri, 21 November 2003 02:14
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| ViNcEnXo wrote on Thu, 20 November 2003 22:22 |
Oh well.
Turns out it was a Blown headgasket.
I could cry.
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I was going to say this is what mine did before I fixed my BHG 
Exhaust/air in the cooling system, temp probe couldn't get a proper reading from the air/gases.
Sorry to hear dude, but, I hate to say it, it is expected if it hasn't been done before.
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Location:
Adelaide
Registered:
September 2003
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Re: 7MGTE - Temperature go up, temperature go down.
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Fri, 21 November 2003 02:17
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Allan,
Are you saying that unless you fully rebuild the block and intend to use mega boost, that a well prepped block and heads with the appropriate torque on ARP studs with the composite gasket will suffice for 14 - 15psi boost ? 
What would be a realistic max boost level for a composite gasket ?
Cheers
Michael B
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Location:
Melbourne
Registered:
May 2002
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Re: 7MGTE - Temperature go up, temperature go down.
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Fri, 21 November 2003 12:46
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| bbaacchhyy wrote on Fri, 21 November 2003 13:17 |
Allan,
Are you saying that unless you fully rebuild the block and intend to use mega boost, that a well prepped block and heads with the appropriate torque on ARP studs with the composite gasket will suffice for 14 - 15psi boost ?
What would be a realistic max boost level for a composite gasket ?
Cheers
Michael B
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With Correct tune and prep it should! (so far 10,000km+ HARD at the razors edge of fuel cut with an in-car block clean, geting a SMOOTH surface on the head, the correct torque figures on the ARP studs and puting it together with care not to damage any surfaces) but if it is detonating goodbye gasket but then I would rather a dead gasket then pistons!
A gasket only blows if theres a problem, be that a monkey on the 7m production line that can't use a torque wrench (unfortunately the case) or poor tune of the engine causing extreme cyl pressures.
Donate a set of 550cc injectors and a 1UZ-FE afm and ill test above 11psi
Allan
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Location:
Adelaide
Registered:
September 2003
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Re: 7MGTE - Temperature go up, temperature go down.
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Sun, 23 November 2003 22:29
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Thanks for that Allan,
As for donataing a set...... ummmm ...... NFW
I guess I will find out one way or another. To start with, I plan to stick to a well tuned setup with the stock/composite gasket and the ARP studs and then see what happens from there.
I'm thinking that 14psi will be heaps of fun. *psi is at the moment, so another 6 will be magic 
Cheers
Michael B
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