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Try to back wash the heater core first if it doesnt work then its clogged up try to turn the heater on the front with the heater off for the back keep an eye on the temp guage if it goes up than normal then its clogged....
Fyi u have to run the engine for awhile with the heater fan on
You will need to be more specific ... front heater wont turn on after using the on switch? Heater blows but only warm air ... heater blows cold air .... see what I mean.
i hadsimale problems on my taho the ac wul not blow cold n the back only the heater would blow and the front would not blow i had to chang the front blower motor and the blower motoer relay in the back every thing is on the top of the rt pass wheel hump swap them out there the same parts to see what broke hat stuf is expencive hope this helps
You are going to need to use a multimeter and have a professional test the relay voltages. This should probably only take an hour, make sure they have the proper electrical schematic for your vehicle year make and model.
If you can get cold air blowing out the front vents, the front heater door is not working properly. If you don't get air blowing out, check the front heater fan and its resistor block.
Notorious for plugged heater cores. Also updated plastic restrictioncouplers mounted at heater core available from dealer. Try back flushing heater core. Run engine till its at operating temperature then carefully hold the inlet and outlet hose breifly with heater fan on high if hoses are nearly the same temp then flow is good , if not then core is plugged.
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