Last year the rear would work fine and the front would take 20-30 minutes to blow somewhat cool air. This year both systems blow warm air. Fuses are fine pressure is normal and I can hear the clutch engage in compressor.
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Not likely, but Is Hot water flowing to heater coil in back? How hot is "very hot" Is it a refrigerant line? If a refrigirant line, Very Hot means it is hot gas from the compressor that "should be going to the condenser coil usually in front of the radiator. It's almost impossible for that Hot refrigerant gas to go to the cooling coil in the back unless you had some repairs done and they weren't certified. My guess is the radiator hot water is not being controlled properly, due to bad valve or control system components.
This is a common problem and the solution usually is that the fron thermostat is usually gone and needs replaising. Shouldn't be too much money to get done. It's just not opening up to let the cold air pass into the from area but the rear one is working fine which allows it to blow cold air.
well what I see you have two problems with you A/C ..1- if the compressor is cycling very fast , the system is probably low in freon , this ban takes like 4lb of freon, now, 2-if we have the right amount of freon and the rear A/C don't work and all the vents are working fine back there for sure the problem is the expansion valve located close to the rear evaporator , that valve get stock open allowing to much refridgerant get in to the evaporator and no cooling at all ,in the back,... you can also have a bad low pressure switch located on the accumulator, making the compressor cycling very fast ..the first you have to do is check the pressures if they are OK , change the low pressure switch..then go to the second problem
Did you hear a little rythmic squeaking noise under the dash by the driver's right knee? Is the noise now gone? There is a little oscillating air flow gate there that often goes bad...I can't remember the name of the part, for the life of me, but the dealer has them.
The low pressure is in the grill by the radiator. The issue your having with it cutting off then on is easily fixed by removing some of the AC coolant. Any ideas on why the rear AC is not working? Is there a seperate fuse for the rear AC? It just blows warm air.
never seen a truck like this ,iam in spain but from the sound of it one belt drives a/c and another the power steering and altenator ,pos water pump as well but this could be driven by the timing belt .As i said i have never seen one of these trucks .If i had it in front of me i could soon tell you .
On most vehicles with front and rear A/C, the two systems are basically independant of each other just sharing the compressor and condensor. It is possible that the Mode Door (controls where the air flow is sent; ie: windshield, vents, floor) is out of adjustment or sticking.