1998 Plymouth Voyager no heat

MISTRD

MEMBER
1998 PLYMOUTH VOYAGER
6 CYL
FWD
AUTOMATIC
150,000 MILES

Rear wiper / int. Rear wiper, air cond. And recirculate air lights all flash. Temp selector and airflow selector do not function. Fan blows, but only cold air. "Airflow direction door" under right side of dash continually "thumps".

If I wasn't an unemployed carpenter, I would offer a donation. Right now, I just need heat so I can work on the rare day when I can find it.......

UPDATE:

In this forum I found directions to calibrate the compuiter. I did this and the result was this:

air cond and recirculate lights flash alternately, while;
rear intermit flashes 8 times, then
rear wipe flashes once, then
intermit flashes once, then
wipe flashes once, then
intermit flashes 4 times, then
repeat sequence.

Help>?

Thanks, mistrd

Another thing, , if this means that the cluster needs to be replaced, what models are compatible? I could get one from the bone yard and calibrate it?

3 Replies

KASEKENNY

MECHANIC
18,907 POSTS

This sounds like you have an issue with the control module or possibly an air door. However, we need to start with the basics and this guide will help get us started.

https://youtu.be/SNRb6pSwYuU

What I would suggest is starting with checking voltage coming from the control module going to the air doors as you are changing them. If the voltage is not changing, then the module is the issue.

https://www.2carpros.com/articles/how-to-check-wiring

More than likely the driver in the module has failed and is not commanding the doors or the circuit board has otherwise failed.

I am attaching the wiring diagram below for your review but if it were me, I would suggest just replacing the module as I have seen this a number of times.

Let me know what questions you have or how this turns out. Thanks

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