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Heater fan imtermittent off then back on

Posted: Wed Jan 29, 2014 12:49 pm
by rksmith88
The heater fan in our car goes off and on intermittently and sometimes three or four times in a row. Any one experience this and have any thoughts on why? Thanks! :?

Re: Heater fan imtermittent off then back on

Posted: Wed Jan 29, 2014 8:22 pm
by The Bone
lose connection

Re: Heater fan imtermittent off then back on

Posted: Mon Feb 24, 2014 11:15 am
by rksmith88
I have to add it only does it on "auto mode" doesn't do it any other mode.

Re: Heater fan imtermittent off then back on

Posted: Mon Feb 24, 2014 1:16 pm
by warment
Bad connection, bad relay, bad blower motor resistor, or bad blower motor...in that order...

Re: Heater fan imtermittent off then back on

Posted: Fri Jul 12, 2019 4:50 pm
by sheck1968
ive replaced the blower motor resistor a couple times in my 13 SHO and it fixes it. the problem is water. gets in when i go thru the car wash. im on here looking for the solution to fix the water getting in. i find ma y say its a known problem and a fix for it but not finding the fix here. help anyone?

Re: Heater fan imtermittent off then back on

Posted: Mon Jul 15, 2019 6:11 am
by warment
If water is getting in, it is likely a sunroof drain. Do you have a sunroof? My brother's 2000 MB ML320 let water in at the right angle rubber sunroof drain near the front right passenger footwell. the "pinched tip" of this drain was clogged with debris.