heater blower not working

[cummins8713]

my 99 cavalier heater blower started acting screwed up. whenever the car is running in higher rpms the blower works and when you let off the gas it stops. now it stopped working alltogether does anyone have any ideas?

[Airjer_]

Interesting! I can say I have never seen one do that.

The first thing I would do is run my own power and ground wire to the motor to see if it runs. If not then its junk If it does than its time to break out a voltmeter/test like and do a little investigating!

[cummins8713]

ya i tested the motor and its fine so i dunno.

[oneroundko]

Had this problem not long ago. It's called the "motor blower sensor" (I believe) and they are COMMON, very common to go out in our Cav's. It's under the passenger side dash and you have to break it out and leave one bolt out when you replace the old one. No big deal. It's a real cheap part too.

(Someone correct my if I'm wrong.)

[Airjer_]

Blower motor resistors are very common parts to fail, but it does not explain wht the blower would work at higher RPM's and then not work at idle.

[oneroundko]

Originally Posted by Airjer_

Blower motor resistors are very common parts to fail, but it does not explain wht the blower would work at higher RPM's and then not work at idle.

It could still be that though couldn't it?

[manicmechanix]

Originally Posted by oneroundko

It could still be that though couldn't it?

Yes your blower motor ressistors were probably going out and giving high resistance so the fan ran faster when your alternator was putting out full voltage at higher engine RPM. Now the resistors are burned out completely.

[oneroundko]

Originally Posted by manicmechanix

Yes your blower motor ressistors were probably going out and giving high resistance so the fan ran faster when your alternator was putting out full voltage at higher engine RPM. Now the resistors are burned out completely.

(It's not my fan, I'm responding to the OP) Like you said it might be the blower motor sensor. When my BMS went out only the high on my instrument panel for my air worked - neither of the other three lower speeds worked.

[audi_hi]

this is my second ford focus i have had in a year and the same problems are happening to me again.
prob 1: the speedo works fine (when it feels like it)
prob 2: the heater/blower does not work at all know

i think its a dodgy earth somewhere, but where anybody have any ideas
thanking you
carl

ps.. the car does seem to get very warm so i suspect its the heater blower thats not working
thanks

[audi_hi]

hey
go steady on the replies folks (lol only jokin)

im assuming that they are both common faults with the focus, or just my bad luck

am i correct in thinkin the speedo has a dodge groung wire, because it does work sometimes (it only cuts out when im near a speed camera lol)
thanks

[oneroundko]

Originally Posted by audi_hi

hey
go steady on the replies folks (lol only jokin)

im assuming that they are both common faults with the focus, or just my bad luck

am i correct in thinkin the speedo has a dodge groung wire, because it does work sometimes (it only cuts out when im near a speed camera lol)
thanks

You're kinda hard to understand. Anyway, I can only comment on the Cavy because I own one.

[Airjer_]

Originally Posted by audi_hi

this is my second ford focus i have had in a year and the same problems are happening to me again.
prob 1: the speedo works fine (when it feels like it)
prob 2: the heater/blower does not work at all know

i think its a dodgy earth somewhere, but where anybody have any ideas
thanking you
carl

ps.. the car does seem to get very warm so i suspect its the heater blower thats not working
thanks

You might have better luck posting this in the ford focus forum instead of the chevy cavalier forum!

[super_man_736]

I had the same problem with my 96` all i did was replace the resistror and the blower motor. Now the heater works fine

[audi_hi]

s@@@ wrong forum
sorry chaps
thanks anyway superman