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No heat in car

jibberlo

jibberlo

New member
Hi everyone, my sisters' 98 grand prix 3.8 has no heat at all. the heat won't come on and the a/c wont turn on ither. i messed around with it for a day and cant figure it out. i was wondering if anyone has had this problem and if so how did they fix it.

i got under the dash on the passenger side and the blower motor is frozen, but their isn't any colant leaking on the floor of the car before this all happened. i dont know if its just froze because the car hasn't had heat for over a week now and there was about 24+ inches of snow around the car.
 


Did you give the car an opportunity to thaw or just put it in somewhere warm...Did you test the coolant?....What temperature of your thermostat? 180oF?
 
i let the car warm up to 210F, coolants at prob level. im thinking that theres a water in the blower motor. i spent all morning dugging out my cadillac now i can get back over to the grand prix.
 


I took a hair dryer to the blower motor and thawed it out and let the car heat up to around 180-190F but still the heat wont turn on. I'm thinking its prob the resistor for the blower motor.
 
Grab both heater hoses if one hot and ones cold its probably a clogged heater core (doubt its your problem). The fan is most likely bad. The resistor would still let it work in high.
 


I would remove the fan and bench test it...It is a pain to get at but not too bad, after you disconnect the power connector. Don't forget to remove the small black air intake hose attached to its side...:)
 
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i will have to check the heater hoses, if there not clogged then i will pull the fan motor. the heater wont work at all, i put the heat on 85F and then change it from low fan to high fan and nothing happens.
 
got heat last night in it, i just turned it on and let it warm up so i could check the hoses and i pressed the heat button and heat came out. thank you to everyone that jumped in on this and helped me out.
 


Nothing, I let the car warm up for like 3 minutes then put the heat on and popped the hood before i could pop the hood the heat started to work. i shut the heat off let the car warm up to 120-140F then turned it back on and it was blowing warm air. took it for a ride and as the car got closer to normal runing temps the heat was nice and hot. There had to be water frozen in the blower motor because after 3 days above 34F outside the car thawed out and now the heat works.
 
jibberlo said:
Nothing, I let the car warm up for like 3 minutes then put the heat on and popped the hood before i could pop the hood the heat started to work. i shut the heat off let the car warm up to 120-140F then turned it back on and it was blowing warm air. took it for a ride and as the car got closer to normal runing temps the heat was nice and hot. There had to be water frozen in the blower motor because after 3 days above 34F outside the car thawed out and now the heat works.
Click to expand...

***that's good news...living in frigid weather does strange things to cars...:)
 
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