[chasealley]

I still need to check the compressor clutch. I spent the evening yesterday just investigating.

There is that anomaly I'm having in the rear aux unit that seems to blow top and bottom with an air mixture sometimes. I removed all parts involved to make sure they move freely. I do have a code for a blend door failure but I can't tell if it is front or back. Either way, both seem to be closing off the heat just fine under most circumstances. Had them all removed and tested with them off.

I removed cover on the relay box and checked out the low and high speed relays. I took the cover off the relays themselves to inspect for burning....none there. Was able to get continuity on all contacts. I didn't switch it with power though so I can't verify that it actually works under normal conditions, just that the two relays have continuity at all the right points.

Funny thing, all of the relays of that size are black EXCEPT for the high speed fan relay which was gray. I'm wondering if it had been replaced at one time. All numbers were the same except for one. Does anyone know if these two relays are supposed to be identical?

To be honest though, I haven't heard that high speed fan come on all year. It was 100F out one day when I was testing. I'm going to have to find a definitive test for that. I heard the fans kick on once in the winter when the car was off though and that kind of disturbed me. I'll also do 12Ounce's test with cold water to help cool and check discharge temp. I'm going to need to check that coolant mixture too because it might be preventing the engine from reaching that 225F or so that is needed to switch the fan on.

Thanks guys. It is raining here so I'll see what I can get done later today and report back. I'm taking pics too so hopefully I can document this when done.