Cold air blowing on passenger even if thermostat is up full!
When I turn the heater up all the way on my '98 LeSabre, some warm air comes out on the Driver's side, but ice cold air blows out on the passenger. It has zone heating. No matter what I do, it is still cold as if the air conditioner is on full. I read in another post that a damper behind the glove compartment was stuck, but that was an air conditioning problem. My dealer told me it was an electric motor that had gone bad and would cost about $600 to tear out the dash and replace it. Any other quick fix solutions or ideas before I spend this much money to fix it?
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the simplest fix is to check your coolant level, if the radiator is low enough your heat wont come on. when the car is warmed up, switch the engine off and check the level in the over flow bottle (located on the passager side) first squeeze the upper radiator hose with a shop towel to check for back pressure. if theres too much pressure wait for the engine to cool down longer. using the towel again remove the overflow cap, the bottle is pressurized so do so slowly to allow any stem to escape without burning you. if the coolant bottle is low, topoff with DEXCOOL (GM approved coolant) once bottle is at the 'full hot' line replace cap and start car back up and switch heat on high/defrost. odds are decent this will fix the issue, and it will only cost you a bottle of antifreeze :)
It sounds like you have air trapped in the cooling system. Try filling the radiator and coolant reservoir cold. Then leave the radiator cap loose and run engine at 1500 rpm until it warms up and the thermostat opens. Make sure heater is on full warm setting.
Assumed your AC unit is OK, but uneven temperature distribution. Try to throw the heater on an off severtime. A sticky valve on the heater would cause similar problem.
Observe the RPM while parking your car. While the AC cut in cut out (or turn on an off). If it cause no load on the engine. The freon may be low or the compressor is bad. In this case only the intake side of the evaporator is cooler than the other side.