No heat in car

[jibberlo]

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.

[coolcat2010]

water could have leaked in from the passanger side the wiper drian tray that is conected to the heater blower fan.

[Burgundyman]

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?

[CTKGP09]

water leak on blower motor? on blower motor rsistor board?

[jibberlo]

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.

[coolcat2010]

jibberlo did u find out!

[jibberlo]

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.

[TheOtherNick]

Did you check the fuse? Extra load from being frozen could have blown the fuse.

[jibberlo]

yes i checked the fuse it's fine.

[Spartan GL]

bad heater core?? is the Heater Core bypassed?

check the Tubing behind the alternator.

[Deimos]

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.

[Burgundyman]

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...

[jibberlo]

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.

[Burgundyman]

Make sure you have power to the fan motor...Use a test light and check the connector for power.

[jibberlo]

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.

[Burgundyman]

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.

What did you have to do?

[jibberlo]

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.

[Burgundyman]

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.

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