heater not getting hot
Thread Starter
Instructor
Joined: Nov 2004
Posts: 230
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heater not getting hot
I have a 94 and the heater is not blowing hot.It seems to have been getting weaker and weaker over time but after draining the radiator and refilling it it seems to be weaker than ever!! Clues??
Racer
Joined: Dec 2004
Posts: 470
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From: Phoenix Arizona
You may not have coolant in the heater core, start the car let it warm up the put the heat on and let it run, should only take a minute to begin heating. If not you may have a bad heater core, is there liquid on the floor panel? Mine is a '90 so I am not well versed on '94's.
Hope this helps
Hope this helps
Instructor
Joined: Aug 2007
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From: www.C4guru.com Everywhere!
You may not have coolant in the heater core, start the car let it warm up the put the heat on and let it run, should only take a minute to begin heating. If not you may have a bad heater core, is there liquid on the floor panel? Mine is a '90 so I am not well versed on '94's.
Hope this helps
Hope this helps
on the heater core. Also, what thermostat are you running. If it is a 160* thermostat, then your car may not be getting hot enough.
Last edited by Corn Flakes; Aug 16, 2007 at 03:39 PM.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
May be plugged up - but first verify that the temp door moves. Remove the Blower Module on the left hand side of the Evaporator Case and look inside. The door should move while someone changes the controls from 60 to 90. If the door works (if it doesn't repost), pull the heater hoses off of the core and flush it out - make sure the hoses are clean too - believe for your Year there's a restriction or check valve from the tank to the core. Clean it. If flushing doesn't bring back the heat and the door works, you need a new core.
Le Mans Master
Joined: Jan 2006
Posts: 6,564
Likes: 6
From: Woodstock Georgia
Safe to assume you bled the air out each time using the bleeder screws? Are both hoses getting hot? 102*F here today, my heater damn well better NOT work!
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Safety Car
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From: Port St. Lucie West Florida
Thread Starter
Instructor
Joined: Nov 2004
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Thanks everyone for the input, I found the restrctor in the hose and imediately snapped it in half.......guess I needed a new one. Replaced it with a 1/2 inch piece of copper pipe for now.Refilled with water and checked the heater. I did'nt know about the bleeders!. Anyway it blows 130 out the upper vents and 115 when I put it on auto 90 . I also noticed that there is virtually no air blowing out on the passenger side!?!? So I have heat and another little mystery!! Thanks again everyone!!
Thread Starter
Instructor
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Le Mans Master
Joined: Jan 2006
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From: Woodstock Georgia
You in Alaska or Siberia? Replace that restrictor ASAP to keep from damaging your heater core with excessive pressure at higher RPMs.
Instructor
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Thread Starter
Instructor
Joined: Nov 2004
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Thanks for the advice I will get another ASAP. I live in sunny california but it still gets cool at night!!
Safety Car
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From: Winnipeg Manitoba, Canada
Race Director
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From: Sherwood, Arkansas
Safety Car
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I just got an 89 Vette. The defrost only blows cold air. I get A/C. When I turn it up closer to 90, the thing quits blowing air. Does this sound like that door you guys are talking about?
Sorry, but I'm new to this tech stuff.
Sorry, but I'm new to this tech stuff.