A/C issues

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red95gtconvert

New Member

May 29, 2006

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Ponca city, OK

Mar 1, 2007

#1

• Mar 1, 2007

• #1

Hello everyone I bought may car a year ago with the air condtioning not working. Well today I figured I would try to get it going and recharged it with one of those Wal-mart kits that has the pressure guage, when I went to charge it I checked it and it had no pressure on the low pressure side so I filled it until it read charged on the guage. The problem is when you turn the AC on to either low or high the compressor and the fan never come on, I ran a jumper wire on the low pressure switch to get the compressor to come on and it did but it never did blow cold air, another thing is my fan never comes on by itself and I have the low speed fan wired to a switch. Any ideas?


Thanks in advance.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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Mar 2, 2007

#2

• Mar 2, 2007

• #2

Are all fuses good?

What was your high side pressure reading with the LPCS jumpered? As soon as the compressor engages, the low side pressure drops right off in a system with low charge.

How many ounces of refrigerant did you get into the system?

Is there power going into and out of the NC terminal of the WOT relay (in the CCRM)? If not, that will keep power from reaching the compressor.

Any other info you can provide will really help.

Good luck.

 

BlownFiveLiter

have car, will race....wait, it doesn't run

15 Year Member

Nov 29, 1999

3,133

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Chicagoland

Mar 2, 2007

#3

• Mar 2, 2007

• #3

Not too sure about the fan not coming on, but you probably need to charge the system more if it's not blowing cold. Once you run the jumper and get the compressor turning, you should continue adding refrigerant. I'm not absolutely sure about the charge our cars take, but it should be somewhere in the neighborhood of 2lbs from what I recall.

 

Stanger007

Founding Member

Sep 26, 2001

2,015

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46

Baton Rouge, LA

Mar 2, 2007

#4

• Mar 2, 2007

• #4

red95gtconvert said:

I ran a jumper wire on the low pressure switch to get the compressor to come on and it did but it never did blow cold air

Click to expand...

Perhaps you have a blown seal in your compressor? If you put in a couple pounds you should see it leaking out of the system - if it is the compressor you'll see what looks like thin oil dripping beneath it just behind the pulley on the compressor casing.

I had the exact same symptoms you did and that was what was wrong w/ mine.

Wes

 

95BLKGT5.0

Founding Member

Mar 18, 2002

608

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16

Auburn Washington

Mar 2, 2007

#5

• Mar 2, 2007

• #5

I have a brand new compressor I will sell you.

Cheap!

 

R

red95gtconvert

New Member

May 29, 2006

382

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Ponca city, OK

Mar 2, 2007

#6

• Mar 2, 2007

• #6

HISSIN50 said:

Are all fuses good?

What was your high side pressure reading with the LPCS jumpered? As soon as the compressor engages, the low side pressure drops right off in a system with low charge.

How many ounces of refrigerant did you get into the system?

Is there power going into and out of the NC terminal of the WOT relay (in the CCRM)? If not, that will keep power from reaching the compressor.

Any other info you can provide will really help.

Good luck.

Click to expand...

Thanks for the replies

The fuses are all good, the pressure tester I used only measures the low pressure and I have no idea what a NC terminal is. I know very little about AC systems and thought I would at least take a stab at it and possibly get it going cheap. Tonight when I got home from work I did check the low pressure and it was right were it was when I recharged it yesteday (45 PSI). I dunno what the deal is

 

T

tjh566

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May 22, 2004

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Northern Va

Mar 2, 2007

#7

• Mar 2, 2007

• #7

did you charge it while running? hook the gauge up while its running and see what it says, a low charge will cause the fan to not come on. Im thinkin it just needs more. Turn the A/C on high and everything while running and start charging the system, the fan will probly come right on.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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Mar 3, 2007

#8

• Mar 3, 2007

• #8

red95gtconvert said:

Thanks for the replies

The fuses are all good, the pressure tester I used only measures the low pressure and I have no idea what a NC terminal is. I know very little about AC systems and thought I would at least take a stab at it and possibly get it going cheap. Tonight when I got home from work I did check the low pressure and it was right were it was when I recharged it yesteday (45 PSI). I dunno what the deal is

Click to expand...

With the jumper wire installed (to make the compressor come on), does your gauge show a constant 45 PSIG? The pressure should move up and down as the compressor moves refrigerant. But if the compressor isnt moving anything, the pressure will stay constant. 45 PSIG would be pretty high for a properly charged system - it would take a bit of refrigerant to get there from an evacuated system.

For the NC comment stuff: If you get to the point where your AC compressor should be locking-up but it doesn't, ensure that the output of the LPCS has 12 volts. If it does, ensure that the positive wire at the AC compressor also has 12 volts.

Please do double check that the compressor is locking - it just doesnt seem like it really is.

Random thoughts. Good luck.

 

The Green GT

No 13 year olds are safe around me.

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Jan 8, 2006

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Louisiana

Mar 3, 2007

#9

• Mar 3, 2007

• #9

Did you vacuum it first?

 

go-stang5.0

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Jan 27, 2003

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Glenview,Il

Mar 4, 2007

#10

• Mar 4, 2007

• #10

Yoe to be honest, you should have taken it to a shop first and had them pull a vaccum in the system once you found out it was empty. If it holds a vaccum it seems to be leak free and you can charge it. Anyways its always good to evacuate the system if it was dry because the air in the system vill produce sub par A/C performance.