Join Date: Jun 2008
Location: Memphis, TN
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Get your money back for the 2 hours! If they cannot check an A/C charge in less then 15 they are taking you to the cleaners.
1. The high pressure switch OR low pressure switch cold be bad. If the compressor clutch is engaging normally and staying engaged, not short cycling on and off, you can most likely rule these two out. Systems can be overcharged and the extra freon forms a slush in the system. Go to the local parts store and get a can of quick freon with a gauge on it. Do not puncture the can. Most are calibrated from between 20 to 60 psi and color coded for too high and too low. (quick and dirty way to check while on the road, may cost you about $20.00)
2. Orifice tube could be clogged, drier clogged. No easy way to check, sorry.
3. Since it is an 04 you may have an accumulation of crud on the evaporator coils. These are in the box under the hood next to the blower motor. It can be a pain but remove the blower and look up in there with a good light. Might need to clean with an old tooth brush some fresh water etc. I did one recently that would barely cool. It had a plastic shopping bag stuck in it. The reciept was from 2009!!! NO JOKE.
If no or little air is moving over the coils in that box no amount of charge in the world will help.
Eagle Diesel Medic - Van & Truck Ambulances
Gota love dual alternators!!!!
3 - 6.7 (2011)
1 - Non-Turbo 7.3 (1993)
6 - 6.0 (2005)
14 - 7.3 (1995 through 2001)