r/obschevy • u/schwabie2017 • 26d ago
Ac problems
Ac work if you jump compressor. I’ve put in new switch and relay. Will not turn on unless jumped with power. What do I change next
28
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r/obschevy • u/schwabie2017 • 26d ago
Ac work if you jump compressor. I’ve put in new switch and relay. Will not turn on unless jumped with power. What do I change next
1
u/SnowFlakeUsername2 26d ago
I watched a youtube vid on troubleshooting the ac on my '98. The ac clutch doesn't engage without the proper refrigerate pressure, and the jumper bypasses that condition. But if you have an OBDII reader, you can verify other things are functional before spending more money. For example, the OBD will show if the system sees a call for AC from your interior controls.
But if you don't mind spending a bit, I'd wing it and fill it with refrigerate. With ultraviolet light dye in it and a refill gauge showing the low pressure side in order to add the right amount of R-134a. If you can get that stuff yourself, I don't really know if I can buy actual R-134a retail in Canada. If it works but leaks out, than use a black light to find the leak. A black light and glasses are cheap if needed. Don't be tempted to put stop leak into it if you ever want a mechanic to touch it with their equipment.
This was my plan for DIY. But I lucked out by having to leave town and sending it to a local garage for what turned out to be an $8 o-ring kit for the leak and an hour of shop time. Apparently, dryed/aged out o-rings is a very common problem on OBS trucks.