Mazda A/C Mystery


#1

Had my 97 Mazda Protege’s A/C diagnosed today, since I get no cool air at all. Interestingly, freon is plentiful, compressor and condensor are in great shape, no leaks in any hoses.
However, mechanic says there is a problem with the A/C Amplifier/the thermo-switch is not providing a ground signal. He also said its something between the evaporator core and the blower motor.

If anyone can help, it would be great.
P.S. the blower motor resistor is fine - I can get hot air at several different levels.


#2

So, you’re saying the mechanic can diagnose it, but can’t fix it?

If that’s the case, find a better mechanic or take the car to a shop that specializes in automotive HVAC systems. They’re not that hard to find.


#3

The AC amplifier is in the cars computer (ECM). It provides ground to the compressor clutch relay (therm-switch?) Start with the relay.