There is absolutely no correlation between the blower motor and the AC compressor on a manual AC system. When you turn the blower motor speed switch from low to high, it simply sends voltage through a resistor and that regulates the fan speed.
The AC compressor is controlled by the PCM which looks at various input sensors. However, the PCM does not control your blower motor. Again, that is a switch input directly to the blower motor.
Is there any chance you are referring to the engine cooling fan by the radiator? If not, I am sorry but this just makes no sense to me which means I would address them as separate conditions.
Let's find out why the compressor is not cycling first. Have you tested your AC pressures? A compressor will not run if the system is low on freon. Let's start there and then move onto the blower fan once the compressor is running because the compressor should come on even if your blower motor is not working.
Friday, May 17th, 2019 AT 6:11 PM