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AC shut down engine

Millwright on Sat September 22, 2007 1:10 PM User is offline

Year: 1990
Make: ford
Model: f-150
Engine Size: 302
Refrigerant Type: 134a
Ambient Temp: 87
Pressure Low: 35
Pressure High: 250

Just replaced everthing but the condensor and everthing went fine now last week I start the truck and turn the air on and it stopped the engine cold,if I restart it with the air on it starts and runs fine and no noise from the compressoe at all,it seems if it sits over night it will do it once at startup and then will be fine until it sit again for is still cooling fine so what doe you think is going on here?by the way the compressor is a rebuilt ready air unit.

Wet in Washington on Sat September 22, 2007 7:51 PM User is offline

Is the compressor locking up, any squealing belts? Is there an idle compensator for when the A/C is on? I'm just offering ideas.

Never take life seriously. Nobody gets out alive anyway.

Edited: Sat September 22, 2007 at 7:51 PM by Wet in Washington

DNT on Thu September 27, 2007 9:17 PM User is offlineView users profile

Classic symptons of a blocked orfice tube. Once the orfice tube gets blocked by the debris left in your old condenser the pressure will build to the point where the compressor is almost impossible to turn which can and will kill the engine. Now once the system is shut down the pressure equalizes (back feeds) thru the orfice tube and screen which pushes the debris back a little bit, unfortunately it will continue to stop up. You might simply replace the orfice tube a few times and hope that no more junk shows up, but it would be best to start over with a good system flush and go back with a new condenser.

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