Cadillac SRX air conditioning intermittent warm at idle troubleshooting repair no AC pressure switch
Channel: Fintech Repair Shop
Date: 2022-04-12

If you don't want to watch video and troubleshooting process then the problem was a corroded AC pressure switch connector. My wife's Cadillac AC became intermittent and stopped blowing cool air at idle. The problem was the AC condenser fan was not turning on and created a high pressure situation. The high pressure situation caused the system to open the emergency pressure relief valve. This in turn created a low refrigerant issue. I traced all the wires back to the source and tested fuses and relays. I was able to find the GM dealer software on the internet and was able to verify the fans were indeed working. The ECU was not being commanded to turn on by the AC system. I traced it back to the AC pressure switch. Once I found the switch, located under the front grill I found the corraded connector. 

AC Tester Manifold set
https://www.amazon.com/gp/product/B08611P91J?smid=A2N2PCJRUJNIQR&psc=1&linkCode=ll1&tag=fintechcomm0f-20&linkId=80e09773f1cc722d80d74a47134b48d1&language=en_US&ref_=as_li_ss_tl

GM AC pressure switch
https://www.amazon.com/ACDelco-15-51343-Equipment-Conditioning-Refrigerant/dp/B01LWENR28?crid=UCP1WNHNOLJO&keywords=cadillac+SRX+AC+pressure+switch&qid=1649742577&s=automotive&sprefix=cadillac+srx+ac+pressure+switch%2Cautomotive%2C109&sr=1-4&linkCode=ll1&tag=fintechcomm0f-20&linkId=81ca8bf0387c9b2d47183efe95bdcb3d&language=en_US&ref_=as_li_ss_tl

AC pressure switch pigtail
https://www.amazon.com/ACDelco-PT2319-Professional-Multi-Purpose-Pigtail/dp/B001C9B610?crid=2R3XSPZO2NFWF&keywords=cadillac+SRX+AC+pressure+switch+pigtail&qid=1649742620&s=automotive&sprefix=cadillac+srx+ac+pressure+switch+pigtail%2Cautomotive%2C98&sr=1-2&linkCode=ll1&tag=fintechcomm0f-20&linkId=5b8e3aab875ffc755fe7b070ed8c24bf&language=en_US&ref_=as_li_ss_tl

J2534 tool to use dealer software
https://www.amazon.com/VXDIAG-Compatible-Tech2WIN-System-Diagnostic/dp/B08K2SXY79?crid=135ER86UBAIKM&keywords=vxdiag+gm&qid=1649742772&sprefix=vxdiag+gm%2Caps%2C123&sr=8-1-spons&psc=1&smid=A3NOMAZHH69LSE&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExWE5TMUwxWkVFNFRIJmVuY3J5cHRlZElkPUEwMTUzNzc5MzRWUlVLM0lWSjRFTCZlbmNyeXB0ZWRBZElkPUEwMDk2ODM3M1A5N0s1N0g4WENIUyZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU%3D&linkCode=ll1&tag=fintechcomm0f-20&linkId=3b8ad1c9fec3c348cb5bfd8243c7837d&language=en_US&ref_=as_li_ss_tl If you found this video helpful or would like help fund future experiments. please donate below.
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