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#1
01-08-2010, 07:43 PM
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problem with constant heat supply
Now that the really cold has hit the northeast, my heat is erratic. When I'm driving the heat seems to respond to the temperature setting. But when I stop for a light or any other reason, the heat stops and the air blowing thru the system is cold. When I start to move again, the heat returns while the car is moving. I tried to clean the temp sensor on the dash but that had no effect. Any suggestions?
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#2
01-08-2010, 07:49 PM
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Re: problem with constant heat supply
Same problem with mine, it's been doing it for over a year now. I've bled the coolant system, changed the thermostat, changed the water pump...all to no effect. What I want to try is back flushing the heater core with CLR to clean it out. It's irritating when the temps are hitting -30 to -40 here.
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Chris 92 Ebony Mica LS-L "A Rolling Restoration": 223,250 KM - Sleeping 2007 STi 6MT, Stance GR+ coilovers, PWR Rad, JDM hood badge, svxfiles 6000K HIDs, JDM Clear Corners, $15/15 min mod, $20/20 min mod, Energy Swaybar Bushings, Hella Supertones horns, Gold STi BBS rims, Group A lightweight crank pulley, A/C system removed, Custom header-back exhaust, Hybrid carbon/metal rear sway bar, restored headlights with CCFL halos 2008 Subaru Legacy Spec B - Diamond Grey Metallic - Sold 2020 Ram 1500 Longhorn - Red Pearl
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#3
01-08-2010, 10:53 PM
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Re: problem with constant heat supply
Here we have two members involved with the same problem.
It would appear that heat is only available when the car is moving, correct?  Does this occur in both manual or auto modes, or is it confined to auto? It would appear that the operation of the motor driven heater air mix door must be involved, and very likely the control system of same. In respect of control and forward motion, I wonder about the ambient sensor mounted behind the front grill. Any mods that could have an effect on this?
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! 
Last edited by Trevor; 01-09-2010 at 12:56 AM.
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#5
01-09-2010, 08:02 AM
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Re: problem with constant heat supply
My 92 does this as well. I thought it was related to my needing to switch out the radiator, but now I'm wondering...
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92 LS-L, Ebony Pearl, 160k miles, sitting in the hospital waiting room hoping for a miracle 06 Hyundai Sonata GLS, 77K miles
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#6
01-09-2010, 10:16 AM
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Re: problem with constant heat supply
You are correct that the heat does come out the vents when the car is moving but not when it's stopped. Cold air does blow out the vents whenit's stopped so the fan is working. This happens when on auto mode but I don't understand what you mean by "manual"mode. My heater/ventalation system is controlled by the temp setting on the round gauge in the dash. Depending upon the temp setting and the sensor under the gauge, I either get heat of air conditioning . If I push the vent button, I still can add heat to the incoming air if I raise the temp setting. So please explain what you mean my "manual" mode. The car is very stock except for koni inserts and Brembro rotors. There are no mods that would effect this. The car is a 94 w/178,000+ miles and this never happened before. ???
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