hello, i have a 1998 jeep cherokee sport. i havent had heat in my jeep for over a year. shop said they thought it was heater control unit. i installed one tuesday i got at the salvage yard. no heat at all. no blowing anything cold or hot. Yesterday on my drive home from work i noticed a little warmth. i had it on 4 and i felt some heat blowing from defrost. not alot but maybe a 2. the heat stops as soon as i stop at a stop sign or light. i had changed the blower motor resister a few months before the heat stopped a year ago so not sure if i should replace that again. any ideas please.

 

you could with a multimeter check for voltage at the blower motor connector, see what you find there if you have voltage there its most likely the blow motor failure or the connector.

marc

 

could you tell me exactly how to do that. my son usually helps me but he is going back on the road and I know nothing about electrical? thanks

 

have you flushed the heater core?

 

we flushed the heater core 4 times saturday backwards and forewards and it didnt change anything.

 

Could be a broken/binding blend door.

 

^ that or water pump. How many miles on her?

 

274000 miles on it. Water pump has been replaced 3 times. Radiator and thermostat replaced last gebruary.

 

Shouldn't be the w/p then. Check out this link then:
https://www.cherokeeforum.com/f2/eas...ailure-225063/

 

i do also have a antifreeze smell when the heat is on but no leaking anywhere that i can see. i looked at the other thread you posted. I will check under my dash in the car for that. i have no heat when the car is sitting. only when i am driving it.

 

Doesn't take much of a leak in the heater core to get that coolant smell so you still may have a leak. After the vehicle is hot feel both heater hoses and see how hot they are.

 

i burped the air out of the system a few weeks ago and felt both heater hoses and i really could not keep my hands on them they both were hot. forgot my password to my other user.

 

i dont know if this will help but the last time i changed the blower resistor, the mechanic said nothing happened when he put it in but later i was driving and the heat would pop on occassionally after going over a bump.

 

does the heater switch work?

 

We replaced the heater control switch a few months ago and i can use ***** 2 and 3. when i turn the first **** it doesnt change any heat flow but the 2nd **** does change direction. I only get a tiny bit of heat when i am driving about 40 mph.