AC Problem

O

Olivia

Guest
Thank You ahead of time. This site has been very helpful in the past. I read post from Tony and plan to donate.
98 Ford escort 2.0L. When I turn on the car the a/c works fine for about 10 mins and the compressor turns off and does not come back on. Outside temp is 80 and inside temp is low 50's. Pressures are 80 for low and high with car off and while ac is running pressures are stable high at 220 and low at 30. The compressor turns off and pressures both go to 80 again. I do not notice the compressor cycling at all it just runs continuously as noted above and then quits. If I turn ac off and on again the compressor stays off but if I wait hours the compressor comes on and does the same thing. Thanks
 

jjm

Hero Member
Joined
Dec 1, 2006
Messages
349
Points
0
Location
NYC
It's unbelievable how complicated they made the A/C circuit on this little vehicle.

Your pressures look good, so shooting from the hip, I bet the problem is the expensive CCRM (Constant Control Relay Module), but you need to do a little testing first. When the A/C quits, check for voltage at the compressor clutch. If you have voltage, chances are good the clutch gap is too wide, or the clutch coil (#7 below) is weak.

If you don't have voltage at the compressor clutch, pull the connector off the low pressure/cycling switch at the accumulator and jumper the two terminals (you can use a paper clip, but don't short anything). It's item #9:



If the compressor stays engaged and cooling is good, replace the low pressure/cycling switch... less than $20 from a Ford dealer, and you don't have to discharge the A/C.

While your system isn't suffering from overpressure, it's possible the high pressure switch is bad. It has four wires, and I think it's on the back of the compressor on this vehicle. It could also be the infamous CCRM as I noted earlier. Usually they fail from bad solder joints that can be easily repaired. It's a $180 part from Ford, and if you buy one don't speak to me. You don't need it, it can be hollowed out and bypassed. It's a really stupid thing...

Joe

If you found this information helpful, please support BATAuto!

 
O

OLIVIA

Guest
Where is the CCRM located? I don't have voltage at the compressor so the next thing I will do as you suggested is jump the terminals of switch on accumulator. You said not to short anything and how would I short something? Thank You.
 

Charlesmac

Newbie
Joined
Feb 27, 2007
Messages
11
Points
0
Olivia: jjm 100% on all answers on this one, just wanted to drop in say that had same problem on ford about 6 months ago, acted same, found out that I had a fuse that showed good when ac was cool, but after awhile the fuse would actualy heat up and seperate but couldnt be seen where seperated, and when all cooled down the fuse actually read good. wouldnt hurt to check it out. good luck.
 
Top