99 powerstroke air conditioning problems

[bartman]

now, IF the compressor had a normal cycle interval once the throttle was goosed, I'd probably rule out low charge... if it cycles less than 10 seconds on, I'd say low charge is the culprit...

It stayed on pretty much constantly from then on.

You opened the hood and monitored it, and with the hood open, it was able to release more heat to the atmosphere... so I'd say... depending on ambient air temperature at your location... it either is normal operation and the high-temp switch locked out the system, or the ambient air temp sensor has what's called an in-range failure...

Where is this sensor located?

now, that nothwithstanding, if you haven't done anything with the AC for a couple years or more, have the system evac'd to remove moisture built up in the refrigerant, and get the variable orifice tube installed... they actually work pretty good and will probably lower your duct temperature around 5 degrees...

I am planing on doing this. I appreciate all of the input and wisdom. I hate chasing my tail and I hate getting taken by a shop. Armed with knowledge and a game plan I can now go to shop and request that they do exactly as I say knowing what I need done. Thanks again.

Bart

 

[JLDickmon]

ambient air temp sensor is right behind the grille on the left side of the truck... kind of a truncated cone shape with two wires going to it...

 

[bartman]

I know which one you are talking about. Thanks again.