AC Pressure Fluctuations

Reply Subscribe

Thread Tools

Search this Thread

08-01-08, 06:12 PM

boosted94

Senior Member

Thread Starter

iTrader: (1)

Join Date: Sep 2002

Location: c

Posts: 344

Likes: 0

Received 0 Likes on 0 Posts

AC Pressure Fluctuations

I just added some freon to my car and the gauge readings are fluctuating bewteen 30-40 psi. Is this normal or what is the problem. The car had leaked out all its freon and is on r134a.

Reply Like

08-01-08, 06:27 PM

JM1FD

Senior Member

iTrader: (1)

Join Date: May 2002

Location: Houston, TX

Posts: 705

Likes: 0

Received 0 Likes on 0 Posts

Quote:

Originally Posted by boosted94

I just added some freon to my car and the gauge readings are fluctuating bewteen 30-40 psi. Is this normal or what is the problem. The car had leaked out all its freon and is on r134a.

What is the high side reading?

If the engine speed and heat load in the cabin are at a steady state, and the compressor isn't cycling on and off, then the pressures should stabilize.

Reply Like

08-01-08, 06:31 PM

boosted94

Senior Member

Thread Starter

iTrader: (1)

Join Date: Sep 2002

Location: c

Posts: 344

Likes: 0

Received 0 Likes on 0 Posts

Dont have the high side reading its just the low side. The pressure was checked at idle and the compresser is not cycling on and off. Its steady on.

Reply Like

08-01-08, 10:40 PM

JM1FD

Senior Member

iTrader: (1)

Join Date: May 2002

Location: Houston, TX

Posts: 705

Likes: 0

Received 0 Likes on 0 Posts

It is really hard to even guess what might be going on without the high side reading. How is the cooling performance? Was this a factory R-134a car?

Reply Like

08-01-08, 11:48 PM

Busted7

Will work for horsepower

Join Date: Mar 2006

Location: Springfield, MO

Posts: 1,865

Likes: 0

Received 1 Like on 1 Post

If you didnt evacuate the system you probley have air circulating in it and it wont compress like 134A causing it to fluctuate.

Reply Like

08-02-08, 02:11 AM

polito Racing

so you got pistons oh wow

iTrader: (1)

Join Date: Nov 2007

Location: Killeen, Texas

Posts: 900

Likes: 0

Received 0 Likes on 0 Posts

yup you either have air or humidity on the lines. flush the sistem with nitrogen. do a good vaccum on it and recharge.

Reply Like

08-02-08, 02:18 PM

boosted94

Senior Member

Thread Starter

iTrader: (1)

Join Date: Sep 2002

Location: c

Posts: 344

Likes: 0

Received 0 Likes on 0 Posts

Well I didn't vacuum it because I wanted to see if its going to hold pressure. Once it does I'll get it vacuumed and filled. Thanks for the help guys.

Reply Like