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1999 Ford Escort A/C Diagnostic help

calinflorin2000 on Sat June 05, 2010 6:21 PM User is offline

Year: 1999
Make: Ford
Model: Escort
Country of Origin: United States

I have a 1999 Ford Escort and I need help in finding out my A/C problem. I first noticed that my A/C went bust after I briefly used it two weeks ago.
I checked my pressure with an A/C gun and it was surprisingly high (100 psi). I reduced it to the normal range hoping that my A/C compressor will start. No luck.
My question is: how do I know what the problem is ( e.g. high or low pressure valve obstructed or oxidized vs faulty A/C compressor)?
The A/C fuse is fine.

Thank you

GM Tech on Sat June 05, 2010 8:48 PM User is offline

Whenever I see Ford escort- I immediately think of CCRM for some reason--

You need to diagnose your system- see if the computer is requesting a/c, then test CCRM module- then if it is bad, replace it or fix it or bypass it with an external relay.

This is all after, you have determined you are not low on refrigerant...

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

mk378 on Sun June 06, 2010 9:01 AM User is offline

It's normal to have a low side pressure of about 100 psi when the compressor is not engaged. The instructions (if any) that come with crap like "A/C guns" don't tell you that. So it was a mistake to let almost all of the refrigerant out. Even after you fix the electrical problem, it's not going to work due to being undercharged.

Edited: Sun June 06, 2010 at 9:01 AM by mk378

calinflorin2000 on Sun June 06, 2010 11:38 AM User is offline

Thanks GM Tech. Do you mean an OBD II diagnostic? I used an Autoxray Code Scout 2500 and here is my reading:

“Check Engine Light (MIL) is OFF
There are No Codes

3 of 8 Readiness Monitors are Complete. The vehicle 's OBD- II diagnostic system reports that one or more readiness monitors are NOT complete. Drive cycles need to be run to complete all supported monitors to meet the minimum required specifications for Federal emissions compliances.”
I used the same reader on a 2002 Escort and I got the same reading.
Where I am doing it wrong?

calinflorin2000 on Sun June 06, 2010 11:39 AM User is offline

Good observation Mk378. I did not know that! Charging/discharging the system is not difficult so I don't worry much about that.

Chick on Mon June 07, 2010 7:25 AM User is offlineView users profile

Most common problem I have with those are the CCRM, it's the black relay modual box that holds the relays for the compressor, fuel pump etc.. Should have a large letter on it..

Email: Chick


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