My car has a new push button climate control unit,just installed before I purchased it(previous owner stated that AC only worked at high speed..) and I just noticed today that there is no heat. AC works
perfect at all speeds,no heater.There is any way that during climate control replacement ,heater was disconected and not conected back?,I guess nobody bother to check the heater in the middle of the summer,so,they instaled the climate control unit and forget to check the heat?

Have you checked your monovalve operation?

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1960 MB 190Db w/ full sunroof
1985 Toyota Pickup
2006 Honda Odyssey EXL R&N
2001 VW Jetta GLS TDI