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Banned user
Location:
ADELAIDE - The Drift City
Registered:
July 2002
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Overheating problem that i cant solve - URGENT HELP NEEDED
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Sat, 13 March 2004 14:05
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I have an overheating problem i cant for the life of me solve!!!
I have a larger then stock radiator, 100 kw 4age with working water pump and my problem is going for a drive that involves some load and stop start traffic the temp starts climbing, now i have a thermo fan and i never used to have any issues, but if im driving hard through the hills or even just taking it eays up a hill in 4th with constant load the temp starts rising.
Ive checked thermostat, operation is normal, i have flushed the block, i have replaced coolant with Toyota red, radiator is almost new and in very good cond, hoses not leaking.
Now the other thinbg is when i replaced coolant i bled the system, let it run for 20 minutes and let the bubbles come out, prob is they dont stop coming... i did this when i put the coolent in and then put the cap on after 20 mins.. then again tonight after a drive and more overheating i pulled into a servo and it was bubbling away...
now i dont think its my headgasket as im not LOOSING coolant, no signs of oil in my water or water in my oil, everything is quite clean indeed.
So... do i needd to keep on bleeding those bubbles out or... what?!?!
I need to know as car will be copping a hiding for next week's drift nationals.
Simon
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Location:
Gold Coast
Registered:
May 2002
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Banned user
Location:
ADELAIDE - The Drift City
Registered:
July 2002
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Re: Overheating problem that i cant solve - URGENT HELP NEEDED
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Sat, 13 March 2004 14:59
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well i forgot to mention this but its always heated up when driven hard on a track, 3 laps of HARD driving and its in trhe 3/4 range, then i'd park it and let it cool.
however it would be fine on the street, could drive anywhere and everywhere with the thermo fan off and the temp would be ion the 1/4 range.
now ive flushed and changed the coolant thats alll ive done and ive got a few problems!
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Location:
The Eastwood MASSIVE !
Registered:
May 2003
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Re: Overheating problem that i cant solve - URGENT HELP NEEDED
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Sat, 13 March 2004 15:01
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Water pump is ok?
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Overheating problem that i cant solve - URGENT HELP NEEDED
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Sat, 13 March 2004 15:15
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when hot is there pressure in the radiator hoses?
compression test? you can have a HG blow (or cracked head) so that air blows into the coolant, but no water is sucked in, with no interference with oil.
lean? too much timing?
i vote with wastgate, hook up an air line to each cylinder in turn and see if you get air going into coolant....
good luck! overheatign probs suck!
Cya, Stewart
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Banned user
Location:
ADELAIDE - The Drift City
Registered:
July 2002
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Re: Overheating problem that i cant solve - URGENT HELP NEEDED
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Sat, 13 March 2004 15:15
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it pumps water and doesnt leak.... soo... yeah!
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Banned user
Location:
ADELAIDE - The Drift City
Registered:
July 2002
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Re: Overheating problem that i cant solve - URGENT HELP NEEDED
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Sat, 13 March 2004 15:19
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Thanks mate i will try all that!
Ive advanced the timing a little but that was a while ago!.
give ity a suss out tomorrow.
| oldcorollas wrote on Sun, 14 March 2004 01:15 |
when hot is there pressure in the radiator hoses?
compression test? you can have a HG blow (or cracked head) so that air blows into the coolant, but no water is sucked in, with no interference with oil.
lean? too much timing?
i vote with wastgate, hook up an air line to each cylinder in turn and see if you get air going into coolant....
good luck! overheatign probs suck!
Cya, Stewart
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Location:
Rocklea qld
Registered:
February 2003
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Re: Overheating problem that i cant solve - URGENT HELP NEEDED
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Sun, 14 March 2004 02:11
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When was the new rad put in. Was it professionaslly flushed. Was the heater vent OPEN when it was flushed because if it wasnt all the crap stays in the heater and first time u tuyrn it on the blockages go back to the radiator. Thermo fan running the right way????? Do u have a shroud?????? Head can be gone without showing oil in water. If u still have bubbles it may be putting compression into the raditor and thats you over heating problem. If a engine fan is available put that on if your racing it as they work alot better then thermos. Sounds like possible blockages though. Get rad cleanedout and also try blocking your heater off by bypassing it. Where are u located???
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Location:
Adelaide
Registered:
June 2003
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Re: Overheating problem that i cant solve - URGENT HELP NEEDED
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Mon, 15 March 2004 01:27
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Yeah, I was thinking it sounded like a blocked radiator. You could get the top tank taken off and get rods put down the core to make sure it gets cleaned.
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Club Member
Location:
sydney
Registered:
May 2002
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Re: Overheating problem that i cant solve - URGENT HELP NEEDED
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Mon, 15 March 2004 01:39
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if its not the head gasket its definately a cracked block.... gas out the radiator after bleeding the air out and driving for a few hours is a good indication theres HOT gasses escaping from the cylinders somewhere.. do a compression check and see if you get a low reading on one or possibly two cyliders (if its cracked between the bores ). Have you put oversize pistons in this engine?? if so cracking between the bores is quite likely depending on the overbore.
goto a GOOD mechanic and get a pressure and gas analysis test on the radiator.. that will tell you straight away if theres gasses from the bore. If the mechanic doesent understand what your asking for goto someone else, as he will clearly not be someone youd want to work on your car.
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Location:
Colac, Victoria
Registered:
May 2002
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Re: Overheating problem that i cant solve - URGENT HELP NEEDED
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Mon, 15 March 2004 01:40
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my guess is a blocked radiator or a blown head gasket
Mine overheats badly - and its definantly blown yet no coolant in the oil - or oil in the coolant ..
I had it bubble tested for gas comuing theu the coolant ( they put sopme sort of pressure cap thing on it with blue dye ) and it definantly showed as blown ..
get themm to throw the bubble tester on it to seeif yours is leaking gas into the coolant ..
If so - BHG or cracked head ..
If not - radiators blocked - as before - get the tanks off and cleaned out properly not just flushed
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Location:
Brisbane
Registered:
June 2003
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Re: Overheating problem that i cant solve - URGENT HELP NEEDED
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Mon, 15 March 2004 07:13
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a lot of engines run hot when you give them a hammering. UNless its boiling, its understandeable it'll get hot when giving it a hammering. Listen to when you turn the car off, to hear if the coolant is boiling. you'll hear a blurp, blurp.
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Banned user
Location:
ADELAIDE - The Drift City
Registered:
July 2002
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Re: Overheating problem that i cant solve - URGENT HELP NEEDED
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Wed, 17 March 2004 09:47
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ok update people.
Have parked on a big fuck off hill so that the radiator is at highest levn, its no longer bubbling air but the problem is somewhat worse, now the water never boils and the rad cap is fair hot but not burn worthy hot.
Driving in traffic i have to have the thermo on all the time, temps creep up at the lights.
now if i park for 10 minutes with the motor off and come back and start it, the temp gauge is waaay high, then as soon as its running it drops back down quickly... sort of like as soon as there is coolant being circulated.
never used to have these probs...
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Location:
Brisvegas
Registered:
June 2003
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Re: Overheating problem that i cant solve - URGENT HELP NEEDED
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Wed, 17 March 2004 10:03
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| Quote: |
Driving in traffic i have to have the thermo on all the time, temps creep up at the lights.
now if i park for 10 minutes with the motor off and come back and start it, the temp gauge is waaay high, then as soon as its running it drops back down quickly... sort of like as soon as there is coolant being circulated
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i had the exact same problem on my old gze...i thought it was a faulty temp gague. Stick a drip tray under car after you come back from a run and have a look to see if any fluid is in there by morning.
i had a prob with a pin sized hole that only let fluid out if the car was sitting there or if i was giving it a boot.
hope you get it sorted...nothing worse than driving around thinking your warping the head 
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Location:
Terrigal
Registered:
May 2002
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Re: Overheating problem that i cant solve - URGENT HELP NEEDED
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Wed, 17 March 2004 10:53
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Not a lot of help, though its quite normal for the temp to go up once you turn the car off and then come back down when you start it again. when you stop there is a lot of heat soak into the cooling system and all heats up then when you start it and it circulates and cools down again.
I had heaps of problems getting all the air out of my 4age engine, as the thermostat seemed to get air stuck behind it and it wouldn't open. Have you tried with the thermostat out?
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