Main IndexAuto Repair Home Search Posts SEARCH
Who's Online WHO'S
Log in LOG

Search Auto Parts

Troubleshooting the system

  Email This Post

EveryGoodNameWasTaken profile image

Jul 23, 2019, 10:57 AM

Post #1 of 3 (423 views)
Troubleshooting the system Sign In

Hey guys, lost A/C in my 05 Chevy Suburban last week. Been looking into it today.

Here's what I've found so far. A/C compressor doesnt kick on at all. Checked fuses and relays, they seem fine. Checked voltage at the low pressure switch. Voltage is good there. Checked voltage going to the compressor clutch. No voltage at all there. Cant seem to locate the high side pressure switch to check voltage going there.

I also hooked up the manifold guages and I've got 40psi on the low side at ~80° ambient temp. Got 40psi on the high side too, cuz uhh.. no compressor action lol.

Not sure what this points to or where to look next. Suggestions?

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 23, 2019, 12:51 PM

Post #2 of 3 (407 views)
Re: Troubleshooting the system Sign In

Your system is empty. You need to completely evacuate and recharge the system to the specified weight.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Veteran / Moderator
Sidom profile image

Jul 23, 2019, 3:26 PM

Post #3 of 3 (400 views)
Re: Troubleshooting the system Sign In

As HT said, the system is so low it won't come on. You should be seeing 90 psi static pressure minimum. 40psi is probably a 1/4 lb or less of refrigerant in the system.
Whatever you wind up doing, be sure to change out the high side service port, those ball ports are a POS and leak all the time.

  Email This Post

Feed Button

Search for (options) Privacy Sitemap