Thought it was low refridgerant. before adding more i checked the pressure in the low pressure line and pressure was at 140. like to know if there is something i can do before going to the dealer or some other high priced tech.
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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.
usually passenger side of truck. Look for the silver colored lines under the hood. One line is low, one is high. There are fittings on each line with a plastic cap. If you're buying the easy kits from the auto parts store with the fill attachment included, just attach it. The fittings on the lines are different sizes so you cannot mix them up. Be sure not to over fill the 134a because too much refrigerant will make it blow hot air also.
What are the pressures?And the low side line going into the firewall should be cold.We need to know what the pressures are,and is the evaporator sweating>and giving off condensation?If the vents are blowing out 80 degrees,then the temp door is not moving .It is either a door actuator motor,or a vacuum that is not working the temp door,check for a bad vacuum under the hood,going into the firewall.
80lbs on the low side is WAY too much if the clutch is running, the high side you should see 125-150ish, the low 30-40. I would feel the lines (the bigger line going into the firewall to see if it is cold when your pressure is right) if so suspect a blend door motor which controls the hot and cold switching inside.
Look for leaks around the A/C hoses and compressor. You may just be low on Freon. When the pressure in your lines (amount of gas in your ac lines) is low, the ac will just cutout hence blowing hot air. try adding some freon.