Mechanics

F350 AIR CONDITIONER WORKS PART TIME

2000 Ford F-350

Air Conditioning problem
2000 Ford F350 V8 Two Wheel Drive Manual 315000 miles

In the morning when I turn on the ac it will work shortly then cut off, I shut the switch off for a short while it begins working again for a while and I repeat the process untill it gets real hot outside then it will continue to work untill I slow down or start stopping and starting at lights then it does not quit pumping but just does not blow as cold. If I run thru a rain storm it will quit completly. At idle it will only blow cool. I have replaced the dryer and orifice tube.
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PLANT769
June 28, 2009.



Does the blower motor stop running? Or the a/c compressor shut off and blower keeps running? Does it have manual or auto temp control?

Merlin2021
Jun 28, 2009.
The compressor quits and it is manual control

Tiny
PLANT769
Jun 28, 2009.
The compresor quits and the blower still works, it is manual control.

Tiny
PLANT769
Jun 28, 2009.
Check the high and low side readings with a manifold gauge set, low should run at 30-40 and high 150-250 from 70- 95 degrees, if it is low on r134, the low pressure cutoff is turning the compressor off, time how long the compressor runs between cylcing on and off and record the outside temp.

Merlin2021
Jun 28, 2009.
I put a guage on low side and it is 35 to 40. I changed the low pressure switch and it worked for a while, I then noticed when the pump cut off I could tap the clutch plate with my finger and it would start again, so I replaced the clutch and it seems to work so far.

Tiny
PLANT769
Jul 5, 2009.
Ok, Good work!

Merlin2021
Jul 5, 2009.