Question about 1983 Cadillac DeVille

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Heater/blower shuts off after car warms up

The heat works great, but only for about 5 minutes. I replaced the heater core, heater water valve, hoses, coolant, and hose clamps. Still the heater will only run for 5 or so minutes then the air stops completely. no hot air, no cold air, i can't get any air to move at all. the digital read out works and responds, i can even hear the little air diverters moving when i change from def. to HI, but no air. any suggestions? could the heater switch be overheating or something? help please.

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  • jward11 Feb 04, 2009

    how would i go about testing the programmer to see if it is indeed the culprit? bench test it? simply hit it with an amp meter?

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Those have a part called the programmer that controlls heater a/c function its most likely the cause.. it located unter the heater box on pass side

Posted on Feb 04, 2009

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Either your heater blend door is failing, your core is plugged, or you have poor coolant circulation. checking the temp of both heater hoses will rule out the core usually. (Warm engine, heater ON, both hoses should be HOT and near same temperature). If 1 hose is hot and the other cold, your core may be plugged. If both hoses are HOT, and still no heat inside, your heater box is likely not directing the warm air properly on the interior. If neither hose is hot or warm, and heater is ON, your heater control valve should be checked to make sure it is flowing coolant to the heater.

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I had this exact problem. Suspect a clogged heater core and you will probably have to replace it. Make sure you have the valve that opens the heater that works. You can remove it and see if it works. The valve is a vacuum valve that is connected within 10 inches of the 2 firewall heater hoses.

If the valve opens and stay opens and passes water well then disconnect the output of the heater and verify the that water flows well and you may be ok with the heater core being ok.
I know you do not like to hear but with all these tests, you should replace the heater core in the cab. It is a pain to remove but doable.

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We live in a cold climate. Our 1998 GMC Jimmy Heater will not provide cabin heat. The engine warms normally. We replaced the thermostat just to make sure the coolant was warm enough. The blower operates...


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DO IT FOWARD AND BACK FLUSH / COVER DIST. CAP OR YOU WILL
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WILL NEED TO BE REPLACED (DASH COMES OUT TO DO HEATER CORE)

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Check the heater hoses,if they are both getting warm,then there is a temp door not opening inside the blower box,It may be cable driven on this model,just look and see,you can move it manualy with your hand to get the heat.

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It sounds like the heater coil needs flushing out or replacing or the heater valve. Look on the engine firewall and make sure the heater valve is opening. If not open it manually and check the heat level. If that produced heat check the condition of the heater vale cable (or vaccum hose).

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I had the same problem and remedied it by disconnecting the heater core at the firewall (you have to remove the plastic shield by the windshield to access) and filling the core with radiator flush. I let it sit for 4-5 hours and then flushed the core with water from my garden hose. To make the connection, I cut a rubber washing machine supply hose, which fit inside the tubes to the heater core.

Once flushed, I added "Water Wetter" to remove any air bubbles from the system. heat now works great.

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1 Answer

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The hoses from your heater core should be very hot to the touch. Check the hoses going to the core from the water pump. It should be very hot. The return hose should also be very hot. Now check the hoses going to the core. If they are not the same temp, then your heater control valve is not working correctly or the vacuum is not working. At any rate, locate the vacuum line going to the heater valve. Remove the silver bar on the valve from the plastic plunger arm. You will have heat all the time now if it was only a vacuum problem. You can fix it later when it's warmer out. BTW a 200* thermostat will make your heater even hotter.

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