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Pontiac Repair/2006 Pontiac Torrent a/c freezing up

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Question
I've replaced the high pressure sensor. I'm full with Freon.a/c still freezes and blows mist. I turn a/c off momentarily and it will resume cooling. what would be causing this?

Answer
Hi Mike.
I'll assume it's cold until the evap freezes up and then you loose air flow as well as it not cooling?

first off you need to confirm the exact amount of 134A is in the system just adding it with one of the sure shot fix it your self cans you but at the parts store is not a correct fix. if the system is charged properly there are 2 things it could be. the Evap temp sensor or the TXV valve is bad. depending on the year And I can't tell you for sure off the top of my head there were a few tears that the temp sensor is part of the TXV valve and I think the newer ones the temp sensor is separate and it's inside the heater box. those are the only other possibilities it could be. if you had access to a true scan tool you could look at the evap temp sensor and see what it's reading when the evap freezes up.
Good luck :-}

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Todd Puccio

Expertise

General auto repair,electrical issues,driveability issues,anti-lock brakes,SIR systems,HVAC,engine performance,Gm specific. I have worked at my current dealership since the 1990 model year anything much older than that I have limited exposure to. I do not have very much transmission experience so those question you may want to ask of another expert. When you send me a question let me know the exact make/model/engine and year for the car or suv you have it makes it easier to answer the questions that way. If your happy with the answer I gave you please feel free to Donate. This is a free service to you and I am not compensated at all by this web site. I have 22 years of experience to share with you and my knowledge wasn't free to me. I had to pay for my education.

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Experience in the area: I have been a technician in GM dealerships for over 22 years and I am a ASE master technician. I work at a Buick and GMC truck store Previously I worked at a Pontiac GMC store for 18 years. I Served a a lead technician when dealership was on a team system. I just recently moved to a Buick,Hummer,Saab Store when my franchise was purchased by this dealership. Organizations: ASE master technician

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ASE

Education/Credentials
Education/Credentials:High school diploma,2 year vocational school degree 2 year college degree. Associates degree in applied sciences (auto technology)Awards and Honors: GMC master technician

Awards and Honors
Master GMC truck technician Master ASE technician in 9 categories

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