March 21, 20197 yr Hi! '94 EA82 SPFI. AC compressor comes on for a minute & blows cold, then stops. Alligator clip the compressor clutch wire to +12v it stays on! Can't believe the system still has pressure and works! Pulser is working sending AC voltage when compressor is spinning. AC relay is good. Next ideas? Wiring to the A/C amplifier? Where is the AC amplifier? Or should I just hot wire the compressor clutch through a switch on the dash?
March 22, 20197 yr Might be the pulse thing. I'd try to troubleshoot it. Many ac systems have over pressure switches on the high side, so check that.
March 22, 20197 yr If it's low on freon, it can kick on but not maintain enough pressure to stay engaged. I would at least put a set of gauges on it to see what it's doing before I did anything else. Has it been converted? Dan
April 21, 20196 yr Author This resolved when I pulled the whole dash. Found the AC amplifier on the evaporator box... it says amplifier right on it so yay for obvious labeling. It can be gotten to through the glove box. Lots of mouse debris in the evap box I'm sure better airflow helps.
July 6, 20196 yr Author Been driving it all summer with max ac on and all good! Can really feel the compressor kicking on and off it sure takes some power out of the little motor. Still, 30.5 mpg doing mostly highway ain't bad for this old a car.
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