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Discussion Starter · #1 ·
Hi guys.

2008 2.7l - my AC died the other day with loud SCREEEEEECH! And the AC button started blinking.

I went ahead and replaced the compressor. After drawing a vacuum, I tried to charge the system but the compressor is not being commanded on.

I verified that the pressure switch is closed (zero ohms) and I have about 70 pounds from the R134a on the low side. The AC fuse is not blown. The AC button no longer is flashing g.

If I jumper 12v directly to the compressor it starts and runs fine.

Something is preventing the compressor from being commanded on, but I don’t know what - and I don't have a wiring diagram.

What am I missing here? Any ideas?
 

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95.5 Tacoma
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Are you getting power to the compressor clutch? Is that relay working? Power for the AC clutch looks to be from the IG No2 fuse. See attached wiring diagrams from 2007 vehicle.

Rectangle Schematic Font Parallel Engineering
Rectangle Schematic Slope Font Parallel
 

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Discussion Starter · #3 ·
Hi ShowStop,

Thank you for the reply!

I unplugged the high-side pressure switch and jumpered the pins together. The system then turned on normally and all is well - even after plugging the switch back in. The compressor runs very quietly and the system is cooling nicely.
 
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