Why does the Heater for 1992 Jeep Cherokee not work?

Answer 1

either your thermostat is sticking in the open position and the car is 'overcooling', thus not producing heat.....or you have a low coolant level condition(maybe from a leak you havent noticed) that is not allowing any antifreeze to flow thru the heater core inside your dash. if you are low on antifreeze then fill plastic reservoir and radiator up to full and that should improve heater. if gauge on dash always reads very low near cold and engine never gets very hot after running for awhile then the thermostat is probably bad. lastly, your heater core could be clogged up and antifreeze cannot flow thru it, thus no heat exchange effect = no heat. this is a little more rare but can happen on high mileage jeeps with the 4.0l engine.

Answereither your thermostat is sticking in the open position and the car is 'overcooling', thus not producing heat.....or you have a low coolant level condition(maybe from a leak you havent noticed) that is not allowing any antifreeze to flow thru the heater core inside your dash. if you are low on antifreeze then fill plastic reservoir and radiator up to full and that should improve heater. if gauge on dash always reads very low near cold and engine never gets very hot after running for awhile then the thermostat is probably bad. lastly, your heater core could be clogged up and antifreeze cannot flow thru it, thus no heat exchange effect = no heat. this is a little more rare but can happen on high mileage jeeps with the 4.0l engine.