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1996 Ford E150 with aux ac -- Possible bad TXV?

jcieslik on Sun June 29, 2008 10:33 PM User is offline

Year: 1996
Make: Ford
Model: E150
Engine Size: 5.8
Refrigerant Type: 134a
Ambient Temp: 90
Pressure Low: 35
Country of Origin: United States

I have not taken a high side reading but here is what is going on.

I have a aux heat/cool system on the car (Air Pro rear unit) and everything works fine up front (orifice tube). The ac in the front will pull all the way down to 35 degree air when I use my laser thermometer. The rear unit will only come down to about 65 (cabin air temp is about 85). I added a bit of refrigerant and it took it down to 58 but that was about it. I have shut off valves in the middle of the car to isolate the rear AC. I am considering putting in a new TXV, cleaning the coil, pulling a vacuum and adding a bit back in. Thoughts on this? I don't want to screw with the system too much since the front is awesomely cold, but I want the people in the back to be comfortable.



Chick on Sun June 29, 2008 10:49 PM User is offlineView users profile

You shouldn't do anything without pressures, other than recharging to factory specs from a deep vacuum. Does the truck have a decal on what the system holds? Or was it added on after the truck was delivered.. Even coach builders usually put the system capacity somewhere to help when recharging their systems..

Email: Chick


Freedoms just another word for nothing left to lose

jcieslik on Mon June 30, 2008 10:25 PM User is offline

OK So I went back to the car tonight and got more info.
Low Side 38
High Side 200
Ambient 90 degrees

Ford Service Manual says

Low Between 20 and 45 at 90 degrees
High Between 175- 255 at 90 degrees

Using a Laser Thermometer I got these readings
Front AC is orifice tube and was putting out 45 degree air and the return air was 75
Rear AC is expansion valve and was putting out 68 degree air and the return air was 78

It seems to me that the rear AC should be a lot colder since it is an expansion valve. Makes me wonder if I need to get in there and replace it. This coil also has heat going to it and I clamped off the hot water line to make sure that was not the problem (I also checked the hot water valve and it is working. The water hoses are not hot going into the rear core.

Any thoughts and suggestions would be greatly appreciated.

Edited: Mon June 30, 2008 at 10:33 PM by jcieslik

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