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Followup To
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My husband has a 1990 Chrysler New Yorker Landau with an automatic transmission. The heater comes on and blows warm air for awhile then the heat stops coming out, but the fan still works and will blow cold air. After shutting the heater off for a length of time it may blow warm air again when turned on. Thanks for any help you can give.
Answer -
Hi Nancy,
There are several explanations possible. First, is it a 4 cyl. or 6 cyl engine? The 4 has a very specific procudure to refill the cooling system or you get air trapped in the heater core which compromises flow. Second, is the engine temp gauge reading mid scale (+/- 1/4) most of the time? If not the thermostat may be opening to soon. The heater core could also be partially clogged or the heater by-pass valve may be partially opened either of which would reduce flow thru the core. Finally, do you have the fancy heater with digital controls, or just good old-fashioned levers and buttons. And is the air distribution system working to direct the flow to various locations as selected? A leak in the vacuum system that directs the air might also be causing the by-pass valve to not work. So let me know the answers to these questions and I can fill in the missing specifics, rather than trying to address all these possibilities at once.
Roland
Hi Roland,
Thanks for your prompt response. Here are the answers to your follow-up questions: It is a 6 cyl. car; temp gauge reads right; fancy heater with digital controls; air distribution system works well. I really appreciate your time. ~nancy
Answer -
Hi Nancy,
I received an alert that you may have sent a response about the result of the test, but when I went to the all expert site there was nothing showing. Just thought I would check in case you had a result or further question. If the test was not remarkable, then I would suggest that your husband check to make sure that both of the hoses feeding thru the firewall to the heater unit are warm. If one of them is cold it indicates that the coolant isn't flowing thru the heater core. That could be due to a build up of crud in the core which he might be able to clear by removing the hoses at the heater by-pass valve to which the hoses are attached and back flushing the unit with a garden hose. Also while he checks that, he should take a look at that by pass valve to make sure that it isn't stuck in the open position which would cause the coolant to by-pass the heater (this valve is vacuum operated, it may have a lever that will show which way it is positioned. It is only supposed to be open when the unit is set for maximum AC, otherwise it flows to the core and back.) One final possibility for low flow thru the core is air being trapped in the core, which might be removed by warming up the car, asking for full heat, then turn off the engine, partially drain down the system while collecting the fluid, then refill ths system. Those are the possibilities if the self test didn't some up with any code numbers about the unit itself.
Hi Roland-
I read about the test using the controls on the heater at work, but I planned to print it out at home. For some reason when you sent the above info it erased the directions to the test (what buttons to push and what to check for). If possible, would you please send me the directions once again? Thanks, nancy
AnswerHi Nancy,
You are correct, the Allexpert site seems to have deleted the response that had the self-test.
SELF-TEST
Warm up the car
Turn off running lights, if on.
Pash the Panel button momentarily
Display should light
Momentarily and simultaneously push the Defroster(symbol), Floor, and Auto buttons
1.All the symbols should light
2.Blower motor should go to highest speed
3.Air should be directed to panel outlets
4.Air temp should become hot then cool
If no to any of the above 4, let me know which.
Then either the display will return to the prior to test setting OR The blower will stop and the display will flash a failure code number between 1 and 18. Record the number and push the Panel button to resume the test (more numbers might be displayed, keep recording and pushing the Panel until the numbers stop coming out and the panel returns to pre-test appearance.)
Let me know which if any numbers came out.
