F-250 2WD 7.3 deisel

GAGGER11

MEMBER
1925 FORD F-250

All of the sudden the air compressor does not run when I turn on the air. The fan runs and there is plenty of freon.I think the problem is a relay, but they are not marked and the owners manuel is useless. HELP! :(

Friday, September 28th, 2007 AT 1:00 PM

2 Replies

BOOTDOG

MECHANIC
665 POSTS

Check the low and high pressure switches. They're located on the high and low side ac lines. Unplug them one at a time and bypass the plug with a paper clip, to see if the compressor engages. If so replace the bad switch.

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Sunday, September 30th, 2007 AT 9:31 AM

TXTOOLMAN

MEMBER
1 POST

I have a 97 ford f250 with the 7.3 powerstroke. I am encountering problems with stalling. I drain the water seperator weekly or more, have changed the oil, and fuel filters religiously, and have heard about a relay on top of the motor that is called a fuel injector control relay? It stalls in slow or stopped traffic, and at high speeds, it will jerk the truck, seeming like it has no fuel flow for a second or two. Does anyone have an answer for this? I am really good with mechanics, and worked on my f150s with no problems all the way to re-building the motor on one of them, but. On this one, I am thinking, that solenoid/ relay, tank selector valve, bad fuel, or just a lot of crap in the fuel. Truck runs like a bat out of hell otherwise.

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Saturday, October 13th, 2007 AT 8:16 PM