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Location:
Melbourne
Registered:
June 2004
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RA40 Heater Core Hose Connections
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Fri, 25 June 2004 01:22
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'scuse the noob question.
There's no coolant flowing to my heater core. Why? Because the previous owner has chopped the hose at the firewall (engine bay side).
I've got the Haynes manual, but can't work out where to reconnect the hose to.
Can anyone help? Also, any ideas on why the prev owner would have done this?
Thanks
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Location:
Brisbane
Registered:
May 2002
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Re: RA40 Heater Core Hose Connections
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Fri, 25 June 2004 01:30
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This was almost certainly done because the heater core is corroded through and leaking somewhere. I strongly recommend you pull it out and inspect it before re-connecting those hoses, or chances are you'll end up with wet feet!
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Location:
Melbourne
Registered:
June 2004
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Re: RA40 Heater Core Hose Connections
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Fri, 25 June 2004 01:39
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Cheers, will do that.
Can you tell me where to connect the hoses in the engine bay once the core is checked out?
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Location:
Canberra
Registered:
February 2004
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Re: RA40 Heater Core Hose Connections
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Fri, 25 June 2004 02:09
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If your still running the 18r-c engine I'll try and tell you from memory. Bear in mind that I'm about 11,000 miles away from the car at the moment. The send and return for the heater come from the front passenger side of the block. They connect to two big elongated nuts 27mm(I think) with hole connections at the side that protrudes from the block. Theres a small ballanceing pipe between the two. These run along the passengers side of the engine bay and enter through the bulkhead. The top pipe has a tap to regulate the hot water flow. Mayby somebody can send you an engine bay picture for a better idea.
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Location:
Brisbane
Registered:
May 2002
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Re: RA40 Heater Core Hose Connections
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Fri, 25 June 2004 03:44
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Here's a pic of my RA23 engine bay; the engine is an 18R-GEU but your 18R-C should be similar. Notice the two big black hoses going from either side of the exhaust manifold to the firewall; that's the heater circuit.
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Location:
Melbourne
Registered:
June 2004
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Re: RA40 Heater Core Hose Connections
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Sat, 26 June 2004 00:55
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Thanks guys. I spent a few hours attempting to get the heater core out yesterday but then realised more dash than I expected needed to be removed. Ran out of daylight, so will try again today.
The pics and explanations are great help. Cheers!
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Location:
Melbourne
Registered:
May 2002
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Re: RA40 Heater Core Hose Connections
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Sat, 26 June 2004 02:13
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i thought doing a heater core on an ra40 was the worst job ever till i got an MA70... thank fuck it wasnt the core on the supra!
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Location:
Canberra
Registered:
February 2004
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Re: RA40 Heater Core Hose Connections
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Sat, 26 June 2004 21:12
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Yeah, from memory when you want to get at the heater core, you have to remove most of the dash and get the whole airbox out. Not something that you want to do too often. But look on the bright side at least you'll be a lot quicker the next time.
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Location:
Canberra
Registered:
October 2002
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Re: RA40 Heater Core Hose Connections
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Fri, 02 July 2004 05:32
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I need to do this on my RA23 this weekend for the first time,..
I am not looking forward to it, but driving to work with white knuckles and a fogged up window is just not fun anymore...
So can anyone tell me how long this will actually take?, I don't want to waste my entire Saturday... is this a 2-4 hour job?
or 5-8 hour job?
are there any shortcuts I can take??
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Location:
Canberra
Registered:
February 2004
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Re: RA40 Heater Core Hose Connections
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Fri, 02 July 2004 15:14
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It depends on how familiar you are with the car. Stripping the dash for the first time always takes the longest after you learn where things go you'll be faster. FOr myself i'd start early in the morning and hopefully be finished in three hours with everything going right. But one little bolt could hold you up half an hour, its always the way. Have you checked the heater core because if your stripping it out you need to have a replacement one to put in if you need to drive the car for work. I'd connect it up and let it build pressure to see if it leaks and were I stood before stripping it out.
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Location:
Canberra
Registered:
October 2002
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Re: RA40 Heater Core Hose Connections
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Mon, 05 July 2004 05:04
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All done,
I had it out in about 1 1/2 hours, and the I spent the rest of the day detailing everything i.e cleaning up all the wiring, tightening everything up, cleaning all parts, replaced all dash light bulbs,.... etc etc
I did test the old one, and it leaked pretty badly, I couldn't find a new one so I had the old one re cored for $145 with a 3 year warranty, so now I have a warm clean car 
[Updated on: Mon, 05 July 2004 05:11]
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