1991 corvette heater/ac fan speed
#1
1991 corvette heater/ac fan speed
The fan on my 1991 corvette ac/heater only blows on high it will cut off and on with no problem from the controls.
I have replaced the CORVETTE C4 HVAC ELECTRONIC CLIMATE AC HEAT CONTROL IN THE DASH and also a new Heater blower control module
So other than that what else controls the speed of the fan
The digital control shows the speed going from 1 to 10 no problem when selected but the fan speed does not change,
Any ideas appreciate.
Is their a verible resister or something I am missing.
Thanks
otis
I have replaced the CORVETTE C4 HVAC ELECTRONIC CLIMATE AC HEAT CONTROL IN THE DASH and also a new Heater blower control module
So other than that what else controls the speed of the fan
The digital control shows the speed going from 1 to 10 no problem when selected but the fan speed does not change,
Any ideas appreciate.
Is their a verible resister or something I am missing.
Thanks
otis
Last edited by trifive; 09-25-2017 at 02:57 PM.
#2
I found the problem, You have to remove the radiator overflow tank and hidden behind it on the firewall is a 5 amp fuse. It is so hidden that it does not look like a fuse it looks like a relay switch, but if you pull down on the 2 wires a fuse popped out, I bet tons of people spent useless money like I did because the corvette dealer and many others on the net also pointed to the parts I replaced with no solution.
Otis
Otis
#3
I found the problem, You have to remove the radiator overflow tank and hidden behind it on the firewall is a 5 amp fuse. It is so hidden that it does not look like a fuse it looks like a relay switch, but if you pull down on the 2 wires a fuse popped out, I bet tons of people spent useless money like I did because the corvette dealer and many others on the net also pointed to the parts I replaced with no solution.
Otis
Otis
The FSM regardless of price would have certainly saved you money, time and much aggravation likely!!
#4
Did not have factory service manual, But the first thing I checked was all the fuses, I then looked at all the corvette sites and all over the net and lots of other guys have the same issue, they changed all the parts I did and even the fan motor with no results,
But I never seen any one give them the answer I found for myself nor did you give an answer until after I found the answer.
You have to remove the radiator overflow tank to find a ting 5 amp fuses hidden behind the tank, that is certainly a crappy design job by gm on this one, they should have put the fuse in the fuse box or atleast exposed somewhere near the fan motor, not hidden.
Otis
But I never seen any one give them the answer I found for myself nor did you give an answer until after I found the answer.
You have to remove the radiator overflow tank to find a ting 5 amp fuses hidden behind the tank, that is certainly a crappy design job by gm on this one, they should have put the fuse in the fuse box or atleast exposed somewhere near the fan motor, not hidden.
Otis