Okay, mechanic has been working on & off a year to figure why AC works 5-15 mins then blows hot. Supposedly changed compressor, condensor, wiring and dash connection switch. Freon is good. HELP already spent $ and do not want to spend more elsewhere, this guy was supposed to fix it. Any idea what it could be, Anyone.... PLEASE!
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I have had a similar problem quite a few years ago. You don't mention the model or year of your vehicle. It could be a relay that is on the firewall just below or behind the firewall in engine compartment in front of driver's side of the car. It took a really savvy MB mechanic an hour to locate and fix after 2 months in other shops, including an MB dealership. Mine was a 1988 560SEL that had that problem. After that was fixed, it worked perfectly for another 5 years - at which time I sold the car.
I hope this helps...
To clarify - - if the truck has rear and heat, you have two heater cores and two evaporator cores. The evap cores carry the freon. If the leak is in the evap core in the front, the price is probably right.