Okay so I'll provide some background here.
I took my 94 Yukon in for warranty work. Apparently the compressor was leaking and needed to be replaced. Prior, it worked fine for over two years (3 year warranty), it just had a slow leak.
So I take it into the shop and they replace the compressor and the high pressure A/C switch after they told me it was nonfunctional. After running it, the vehicle started to blow the a/c fuse.
They diagnosed the issue as a non-unwarrantable wiring issue so I agreed to have the "clamping diode" replaced and to have the wiring harness fixed. I was told this would be all I need to get it back on the road. Usually, I like to do things myself but the shop had it all apart and had already charged for a full diagnostics to check the A/C system because it wasn't coming from one of the parts they had previously replaced so I bite the bullet and paid for it to be fixed.
Now they called me today and apparently the low pressure switch has melted and I'm asked to replace that.
Although these are minor wiring issues, it's a rather expensive shop quoting me about $700 CAD ($160 diagnostics, $100 clamping diode, $140 pressure switch, $30 connector $200+ labor) after just on these non-major issues so far on what I expected to be a no-charge warranty item. I'm a bit stressed about the situation.
I'm thinking the new compressor may have caused these issues as none were present before this warranty work.
A few questions.
1. Did the fuse ever blow prior to the parts being replaced?
2. How long is a while? Fuses are designed to run at slightly elevated levels for a short period before burning out.
I would use a multimeter in place of the fuse and check the amperage flow with the system on. This might give you an idea of when and where the spike or gradual increase is according. My guess is a faulty compressor clutch. I would bet you see a spike when the clutch kicks in. But I am not an AC guy, so I could be very wrong.
1. No. It worked find.
2. I was told a few minutes.