North American Turbocoupe Organization



Lack of heat
Seanm5005 Offline
Member
#1
I was wondering if anyone had a suggestion on this. I have an 87 TC that hardly heats. I thought the heater core was plugged with trash, so I treated the cooling system with some cleaner. I them back flushed the system, with a garden hose hooked-up. I have flow through the heater core but I'am unsure of what to look at next. I have also noticed recently that the UPPER radiator hose will collapse when I have been playing with the throttle, while trying to figure out the lack of heat problem. Could it be that the water pump is bad and can not move much water. When I bought the car in august the previous owner stated that it had a three row radiator? Which it does, but I am not sure where to look now. Thanks Sean.
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tps87turbo Offline
Posting Freak
#2
If you get good flow from the heater core you just flushed out, then that should be fine unless you have a leak, which you can tell by the smell of antifreeze or mist coing from the vents. Your thermostat may be stuck open causing your lack of heat. They are not that expensive to buy & install - maybe 5 or 6 bucks tops. I would try that & see if it makes a difference. If not, then I would look at the water pump, which should run you around $45 or $50. IMHO, I would replace both & the hoses if they look bad so you know that your cooling system is in tip top shape.


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Tony Sceia
Red 88 TC loaded with every option, Walbro 255, 3- core Radiator, Star Stage 3 Clutch, Rebuilt T-5 Tranny..... Now I just need to do some Body work & she'll be like new.
Tony Sceia -

HIS Red 88 TC
http://turbotbird.com/showroom/data_r-z/...a_88tc.php
HERS - Blue 87 TC, fully loaded with every option, Work in Progress
87 Gray TC Parts Car - Gave to BJL and is now his daily driver
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philS Offline
Senior Member
#3
There's two things that could be happening if you're not getting heat (to the interior):

a. The coolant in the heater core is not getting hot. This could be a thermostat stuck open, radiator cap not holding pressure (although if it was, you would still get some heat), or some OTHER blockage to the heater core. Or, you simply don't have enough coolant in the car (or you do, but there are air pockets).

b. The coolant IS HOT, but the radiant heat is not making its way to the interior. In this case, there's something wrong with the flapper door that lets heat out of the heater box and out to the cabin.

Do you know how hot your coolant is getting?

If the upper hose collapses easily, you should replace it. The hose can be soft when it gets hot, but you'll know when it's too soft and it needs to be replaced.

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86 TC, 73 Mini, 72 Mini Van project (w/ LS-1 motor)

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Pete D Offline
Administrator
#4
You should replace the collapsing upper hose.

Which heat/ac system do you have? Manual or EATC. It sounds like your "blend" door may not be in the correct position for proper heat, ie most of the air going to the cabin is not passing through the heater core.

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NATO Member. it's not a vice, it's an obsession
You only need two tools in life; WD-40 and Duct tape. If it doesn't move and it should use WD-40. If it moves and it shouldn't, use Duct Tape.
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[This message has been edited by Pete D (edited 11-06-2003).]
Pete Dunham


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1owner88TC Offline
Member
#5
I vote that it's probably in the control system too. Could be a vacuum hose, linkage etc
fun, fun, fun - Justin
3" DP & Cat, Magnaflos, K&N, Magnecor Race wires, Steeda Tri-Ax, SPEC Stage 2 clutch, 3-core radiator.
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Seanm5005 Offline
Member
#6
I have replaced the T-stat, I have disconnected the leaving side of the heater core and flushed to make sure I had flow. I also checked the heat control damper and it closes fully. I have a manual A/C - heat system. I have premixed the antifreeze to 50/50. I will replace the upper radiator hose. I thought that the upper hose was on the discharge side of the pump? If so then something is drastically wrong as the upper hose should be pressurized and not collapsing the hose. Sean
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Pete D Offline
Administrator
#7
The upper hose comes off the T-stat housing and allows flow TO the radiator.
Pete Dunham


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Seanm5005 Offline
Member
#8
So if it allows flow to the radiator then should'nt it be pressurizied, and the lower is what the pump is drawing from? BTW I just picked up a new water pump, and as soon as the car cools down I am going to replace it. The car has 204,000 on it and I am not sure what has been replaced and what has not. Sean
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Pete D Offline
Administrator
#9
There's a lot of good info on cooling systems here: http://www.stewartcomponents.com/html/
Pete Dunham


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Seanm5005 Offline
Member
#10
Thanks Pete. Sean
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