Recently bought a 55 210 wagon that had an aftermarket ac system installed at some point. The controls work off a stock looking heater controller. I have no idea of the manufacturer.

When I turn on the heater it only blows slightly warm. However I noticed that as soon as I turn on the blower, the ac compressor kicks on as well.

Does anyone know if the compressor should come on with just the heater? I did verify that the heater control selector when pushed down is working the heater control valve (cable controlled only, as far as I can tell).

Any info would be appreciated.

Thanks
Scott