Thread: ignition harness.....

i know my ignition harness is getting old and my electric is acting weird because of it.....could this cause my ac to stop working? because it randomly stopped working i dont even hear the ac clutch engage anymore.....

AC clutch..I know it's responsible for HVAC fan operation, never heard about compressor clutch though. I thought that was relay operated by the pcm based on the headunit AC request.

so the ac clutch is bad or is it possible the hvac is not commanding the AC to engage?

Have you checked the freon pressures on both high and low sides? There's tons of things that can keep AC from working.

It MIGHT be ignition switch related (mine was).

But BillBoost37's advice is best; do the proper diagnosis before you start replacing parts.

no i havent done that im gonna go get a recharge kit today that has a pressure gauge on it should i be hearing and seeing the clutch engage regardless though?

A recharge kit is a band aid for someone without better inforamtion. That'll only tell you the approximate low side pressure. If your compressor is shot and the high side is low, you'll never know it with that kit.

You really want some real gauges for ac to save time, effort and money in the long run.

ok i definately need a new harness cause alot of things are acting stupid so ill do that today then ill test the ac at a shop if it still isnt working then thanks bill

I'm still pretty new to the W body ignition harness issue. Mainly because I've never come across one that went bad. I'm kinda a hands on learner. At least that's what I keep telling the woman.

JMT, you had one keep yoru compressor from kicking on?

Re: ? from BillBoost37:

My car (2002 GTP) did all kinds of screwy things when I bought it earlier this year.

I bought it in Florida and drove it on vacation for a couple of weeks, then drove it home to Michigan. It had about 93k miles on it when I picked it up.

There was a constant clicking noise from a DRL relay (sounded like the turn signal flasher) EXCEPT when I turned off the A/C compressor switch or turned on the Park lights or headlinghts.

The A/C compressor clutch would not engage if the light switch was in the "Auto/Off" position. If I turned the light switch to the "Park" or "On" position, the A/C clutch would work perfectly.

Sometimes all blower speeds would work, sometimes only the highest speed worked and sometimes only the two lowest speeds didn't work.

I had no A/C indicator lights.

All through this time, the DIC display would appear to be OK at times, but after a few minutes of driving it would go very dim. All DIC functions worked. When it was dim, you could see it (just barely) at night, but not at all in daylight. Adjusting the dash lamp dimmer switch made no difference when it was acting like this.

And the HUD display was so dim, I could never tell if it was working at all.

I found the "Sparkys-answers" website and followed his posted diagnostic procedure for the blower speed issue. When I opened up the fuse box, I found no blown fuses, but I had intermittent voltage at the HVAC/DIC circuits.

Since replacing the ignition switch, everything has worked perfectly.

do i need to go oem for this or is it safe to get a bwd one?

I bought OEM (got a friend in the business...) but I don't think you'd have a problem with a quality aftermarket part.