Heater Blower Fan Question.....
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,713
Likes: 31
From: Shreveport LA
LA Events Coordinator
Blower Fan Question.....
I have a 75 Vert and I noticed today,(I used the heater for the first time) when I have the fan running on the top two speeds and I turn the engine off, the engine continues to run for about 1 sec (which is a long time after you turn the key to off) 
. When the fan switch in the 2 lower speeds, the engine turns off correctly (immediately). Has this happened to anyone? AND is it hurting anything?
By-the-By, this summer I had to have the ignition wire re-wired (by the Chevy dealership) directly from the battery through the ignition to the starter solinoid AND I ran the A/C on high speed and did not notice this "problem".
. When the fan switch in the 2 lower speeds, the engine turns off correctly (immediately). Has this happened to anyone? AND is it hurting anything?By-the-By, this summer I had to have the ignition wire re-wired (by the Chevy dealership) directly from the battery through the ignition to the starter solinoid AND I ran the A/C on high speed and did not notice this "problem".
Last edited by vetteguy75; Nov 24, 2004 at 05:24 PM.
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by vetteguy75
Hello...is anybody out there? 
Ha ha
Ha hathats interesting , i have a 77 coupe so what i say may not apply to your car.... i would start by un plugging the fan blower connections on top of the htr box in the engine compartment and retry your "diagnois test" it will be intereseting to see if it repeats itself or not....
Burning Brakes
Joined: Oct 2004
Posts: 904
Likes: 0
From: Murphy NC
My guess would be the blower fan motor is acting like a generator and while freespinning after it loses power, its sends power back into the system. When it was rewired a wire or 2 (or 20) could have been missplaced or chopped up to make everything work and a wire may run to the coil from the blower motor. A ground possibly. Hard to say but just a guess. Justin
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by hosspowerinc
My guess would be the blower fan motor is acting like a generator and while freespinning after it loses power, its sends power back into the system. When it was rewired a wire or 2 (or 20) could have been missplaced or chopped up to make everything work and a wire may run to the coil from the blower motor. A ground possibly. Hard to say but just a guess. Justin
i didn't know it could do that.
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,713
Likes: 31
From: Shreveport LA
LA Events Coordinator
Originally Posted by hosspowerinc
My guess would be the blower fan motor is acting like a generator and while freespinning after it loses power, its sends power back into the system. When it was rewired a wire or 2 (or 20) could have been missplaced or chopped up to make everything work and a wire may run to the coil from the blower motor. A ground possibly. Hard to say but just a guess. Justin
Burning Brakes
Joined: Oct 2004
Posts: 904
Likes: 0
From: Murphy NC
It wouldnt hurt anything. But I would try unplugging the switch to see if it does the same thing. It could have something to do with the alternator too. Sending power back into the system. Electrical problems are the worst. By the way Im taking GM electrical systems classes so this is where Im getting this from. Sounds bogus but it happens.
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Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,713
Likes: 31
From: Shreveport LA
LA Events Coordinator
Originally Posted by hosspowerinc
It wouldnt hurt anything. But I would try unplugging the switch to see if it does the same thing. It could have something to do with the alternator too. Sending power back into the system. Electrical problems are the worst. By the way Im taking GM electrical systems classes so this is where Im getting this from. Sounds bogus but it happens.
I will try it in the a.m. (after I wash and wax her...it's suppose to be clear and high is going to be 68f) 
As long as it doesn't hurt anything and that's the only problem I have...then I have ALOT to be Thankful for on this Thanksgiving..... I will keep you posted on my findings....