A/C strange behaviour

[Asfalto]

Hi everyone!
My truck: 1998 tahoe Lt 4dr 4wd 5,7 vortec (with rear A/C)

My Front A/C is blowing cold but in "long" trips after 45 min at least (expecilay freeway driving) it starts blowing warmer and stibilizes on a poor cooling.

The system has been leak-checked and charged at an a/c shop at the beginnig of this summer.
Rear a/c is fine.

What can i check?

thanks

 

[98blackbell]

I am no expert but seems I had this problem as well. I think it is something with the low pressure hi pressure switches.

---------- Post added at 07:33 AM ---------- Previous post was at 07:29 AM ----------

Nope looked at my receipts and ended up with a compressor. The clutch would slip after long runs. Figure on $500 if you pay someone. I had to because of no a/c equipment.

They replaced the drier as well when mine was fixed 4 years ago. I just had the low pressure switch quite on mine.

 

[SunlitComet]

if the rear is perfect whether the front is goo or bad, look into and orifice valve issue or a defective temp control issue in the control head/hvac housing.