RE: Heat problem with Plymouth Voyager

Tiny
DON FLYNN
  • MEMBER
  • PLYMOUTH VOYAGER
I have a 1996 Plymouth Voyager (3.0l) with about 185,000. Recently the heat has not been working. The air blows but it is lukewarm at best. My usual mechanic looked at it and orginally thought it needed a new heater control module. After being scared away by the price of a new one, I looked online for a used one and was about to order it when when one of the sales guys happened to mention that it needed to be brought to the dealer to be programmed. I mentioned this to my mechanic, who then checked with his "computer guy" who told him, based on the mechanic's summary of the problem, that replacing the heater control module with a used OR new one would not necessarily solve the problem because (and I don't really follow all of this) Chrysler is not like GM and doesn't readily share the codes (?) Or something like that. So, they both advised that I simply take it to a Chrsyler dealer. No offense to dealers, but I loathe to do that because I think they often overcharge. So, I had another mechanic friend (who works for GM) look at it and he thought the heater core needed to be flushed since one hose was hot and the other was not. But he could not do it since he was on his lunch hour and was doing me a favor. So, I brought it to another mechanic around the corner from me (mechanic #3) and asked what he thouhgt the problem was. He flushed the heater core, disconnected the a/c compressor, and said it was fixed. The only problem--it is still the same lukewarm air and is defintely NOT fixed. For the record, mechanic #1 (my usual mechanic) said it is definitely NOT the heater core. I still have to talk with him to see why he thinks this. Although he appears to be right (contrary to mechanics #2 & #3), how does he explain the one hose being hot and the other not? At any rate, I have three guys with conflicting diagnoses and a van with very poor heat and a wife who wants to give me her van and take my car. HELP!
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Sunday, November 18th, 2007 AT 7:06 PM

3 Replies

Tiny
TOBYU
  • MEMBER
One hose hot one. Not is the key I think.
The heat IS getting into the cabin thru the heater core and it is giving off any heat it has. But the flow is too slow. So the coolant in the heater core gives off all of its heat and the returning flow on the cooler hose is too cool.

There should be a black plastic heater control valve. Metal and plastic. In one of the two lines going to heater core.
This valve will have a small vacuum line to it.
This is the valve that turns on or off the flow of coolant from engine to heater core.
Bypass the valve. Remove it and put the hose straight to heater core to see if you then get good heat.
The part is available at about any local aftermarket parts retailer for around 20.00 or less.
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Monday, November 19th, 2007 AT 1:32 AM
Tiny
RASMATAZ
  • MEMBER
Something is very funny here and am not laughing we have our own clown in here.

Both heater hoses should be at the same temperature -if its going thru the heater core.

Could be clogged up hose or the heater core.-Hows the coolant level in the radiator is it to the full mark.

Did they check the thermostat could be opening up to soon wrong type.

Try bleeding out the cooling system see below

Always bleed air from cooling system after replacing coolant. Set heater for maximum heat. Remove radiator cap. Loosen drain plug and remove drain bolt (if equipped) from engine block. Drain coolant reservoir. Fill coolant reservoir to MAX mark with 50/50 water-coolant mixture. Loosen bleed bolt and fill radiator up to base of filler neck. Close bleed bolt when coolant flows out without bubbles. Tighten bleed bolt. With radiator cap removed, start and operate engine to normal operating temperature. Add coolant if necessary and check for leaks.
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Monday, November 19th, 2007 AT 1:38 AM
Tiny
DAVECK
  • MEMBER
I have athe same thing-i relplaced the heater core-thermostat-heat sensor-pullled on heat cable to see if the door was stuck(i checked this when I had housing out of the van-i shot it with w-d -same problem HELP PLEASE ITS DRIVIN ME NUTS
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Friday, November 23rd, 2007 AT 9:49 AM

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