AC question

Reply Subscribe

Thread Tools

Search this Thread

Jul 15, 2016 | 08:15 PM

jazzmk1

Thread Starter

Racer

Joined: Jun 2005

Posts: 291

Likes: 11

AC question

I'll make this short and sweet. My AC shuts off when car is not moving. The fan inside the car still running.....WTF...???

Jul 15, 2016 | 08:43 PM

jrose7004

Team Owner

Joined: Mar 2004

Posts: 58,510

Likes: 1,843

From: Oklahoma City OK

C6 of Year Finalist (appearance mods) 2019

Normally that means the compressor has gone bad whenever I've had a car that's done that.

Jul 15, 2016 | 08:47 PM

jazzmk1

Thread Starter

Racer

Joined: Jun 2005

Posts: 291

Likes: 11

I just did a check to see if the clutch engaged on the compressor not at idle. Belts are new and tight

Last edited by jazzmk1; Jul 15, 2016 at 08:49 PM.

Jul 15, 2016 | 08:54 PM

AzMotorhead

Limping across the line

Joined: Oct 2002

Posts: 5,299

Likes: 109

From: Peoria Az

Could be a couple of things
1. Low on charge. Engine speed drops at idle thus compressor slows and pressure drops causing compressor to disengage.
2. Cooling fans have crapped out. Once you start moving you get airflow across the condensor and the system starts working.

Reason inadequate airflow causes the compressor to stop is because the Hi side pressure increases to the limit switch trip point which cuts power to the compressor clutch.

Oversimplified

Jul 15, 2016 | 09:05 PM

jazzmk1

Thread Starter

Racer

Joined: Jun 2005

Posts: 291

Likes: 11

Here's a kicker, I just pulled and cleaned the fuses and relay for the ac blowing cold at idle now..???? Will give it a couple of days to see what happens next. The for all the advice for now...lol the fan is working fine

Last edited by jazzmk1; Jul 15, 2016 at 09:06 PM. Reason: Additional text

Jul 15, 2016 | 10:19 PM

mrk1957

Racer

Joined: Jul 2014

Posts: 469

Likes: 44

Low on charge

Jul 15, 2016 | 10:24 PM

LowRyter

Melting Slicks

Joined: Feb 2016

Posts: 2,984

Likes: 380

From: Edmond Oklahoma

engine was probably getting hot and air con was disengaged.

or it could be that idle speed doesn't generate enough RPMs to get a lot of cool air.

you didn't mention if the air works when your're moving and maintains a cool temp.

Jul 15, 2016 | 11:22 PM

User Omega

Melting Slicks

Joined: Mar 2016

Posts: 2,211

Likes: 237

From: Indianapolis IN

I will agree with the above.

It is either low on charge or is running high discharge due to poor airflow across the condenser. Could be a few things cause that.