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AC Problems

jparson

By jparson
in Troubleshooting & Recalls

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jparson New Member

jparson

Posted
Posted

2017 GMC Sierra AC  was blowing warm air so went to shop and hooked up gages to AC and just thought it was low so i decided to pull a vacuum on it and it  held then put Freon back in the system and it started cooling just not like it did when i first got truck. about 2 week it started warming up so i added some more freon to it and it cooled down for about a week. after that i pulled another vacuum and added leak detector to make sure i didn't have a leak. Found no indication that i had a leak in the system. decided to change the expansion value pulled another vacuum on it and added freon to the system this worked for 2 weeks. so i decided to pull another vacuum on it and then decided to add stop leak to the system just in case i had a leak and didn't find one. the also worked for 2 weeks and now it is blowing warm air. i am working the AC button in the cab and it would start blowing cool and work while i am driving to work. once i leave work it is blowing warm air and i push the button again multiple times and it eventually start to work but not good. Tired of throwing money at this thing because we know that 1234yf freon isn't cheap and it takes 2.5 cans everytime you need to fill the system. 

JimCost2014 Senior Enthusiast

JimCost2014

Posted
Posted

Taking my 18 in Friday to have the condeser replaced. Air was ice cold until last week, then really warm. Had the system checked, bone dry, and then pressure tested, leaking at the condenser, the new and improved factory one for model years 2018🤔

 

These trucks really make it hard to own them at times.

laranke88 New Member

laranke88

Posted
Posted (edited)
On 8/28/2024 at 7:20 PM, jparson said:

2017 GMC Sierra AC  was blowing warm air so went to shop and hooked up gages to AC and just thought it was low so i decided to pull a vacuum on it and it  held then put Freon back in the system and it started cooling just not like it did when i first got truck. about 2 week it started warming up so i added some more freon to it and it cooled down for about a week. after that i pulled another vacuum and added leak detector to make sure i didn't have a leak. Found no indication that i had a leak in the system. decided to change the expansion value pulled another vacuum on it and added freon to the system this worked for 2 weeks. so i decided to pull another vacuum on it and then decided to add stop leak to the system just in case i had a leak and didn't find one. the also worked for 2 weeks and now it is blowing warm air. i am working the AC button in the cab and it would start blowing cool and work while i am driving to work. once i leave work it is blowing warm air and i push the button again multiple times and it eventually start to work but not good. Tired of throwing money at this thing because we know that 1234yf freon isn't cheap and it takes 2.5 cans everytime you need to fill the system. 
Ps: geometry dash meltdown has become an integral part of my free time, the excitement and challenge always keeps me coming back to this game!

There could be an electrical issue causing the AC to work intermittently. Check the wiring and connections to the AC system, including the AC button in the cab.

Edited by laranke88

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