Air Conditioner and Idle

00GTpony

Member

Mar 10, 2007

162

0

16

May 18, 2007

#1

• May 18, 2007

• #1

Whats up guys, i have a pretty smooth idle just sitting there in neutral , but then the second i turn the a/c on the light constanstly bounces up and down.. like it will rev to 1800 then drop to 500, then right back up to 1800 over and over again, same wen i put the deforster button on... any ideas?

New iac already, cleaned throttle body, and cleaned maf

 

lvmustanggt

New Member

Apr 9, 2006

721

0

0

Las Vegas

May 18, 2007

#2

• May 18, 2007

• #2

I had same problem, refill a/c. Problem solve

 

Superhereaux

chicks make me feel inadequate

Founding Member

Jul 30, 2002

538

3

59

South Texas

May 18, 2007

#3

• May 18, 2007

• #3

when was the last time you had an a/c service? might be low on freon or your a/c fan might not be working, high pressure in the system might put more strain on the compressor

 

T

thomas91169

I'd donkey punch my sister.

Aug 19, 2005

0

0

0

Modesto, CA

May 18, 2007

#4

• May 18, 2007

• #4

does it still blow cold when turned on? how is driveability or the rpm's during constant cruise with the a/c on (freeway cruise at ~1500-2000rpm)? does it take a while to get cold? as much as i hate the stealerships, when it comes to AC crap and all homebrew methods of repair fail, id just take it to them. if it costs too much to repair you either 1) dont need/want a/c enough to warrant the cost, or 2) just stop using a/c

 

the98stang

Active Member

Aug 12, 2005

2,408

0

47

Clovis, CA

May 18, 2007

#5

• May 18, 2007

• #5

If it is still blowing cold, it's the cycle switch. If not, you have a leak in your AC system somewhere. Any A/C shop can evacuate the system and fix the leak. Problem solved.

 

00GTpony

Member

Mar 10, 2007

162

0

16

May 18, 2007

#6

• May 18, 2007

• #6

How do i check fluid levels on the a/c ?

 

the98stang

Active Member

Aug 12, 2005

2,408

0

47

Clovis, CA

May 18, 2007

#7

• May 18, 2007

• #7

00GTpony said:

How do i check fluid levels on the a/c ?

Click to expand...

You need special gauges for the job. Try shorting the cycle swith by connecting both prongs together with a paper clip. Do this for only one minute, or you can fry the compressor. If the idle stops jumping, then the cycle switch needs to be replaced. It is located on the firewall, passenger side. It looks like a miniature cigar sort of.