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71' fan speed switch on hi.

walkman

Active member
Joined
Jul 9, 2003
Messages
33
Location
ca
Corvette
1971 Stingray Bridgehampton Blue
Have a 71'. Fan speed won't come on in hi position of the 4 position switch. I was told it is a resistor in the back of the duct work. Has anybody had this problem and how do you change it. I have a new one. I have searched threads and found none on this problem.
 
Joined
Jan 1, 2002
Messages
7,246
Location
Washington, Michigan
Corvette
'67 Marina Blue Convertible
If you don't have A/C, blower speed is fed from the blower switch and the heater resistor located on the inside heater case, with high speed bypassing the resistor. If you have A/C, the lower three speeds are fed from the blower resistor located on the underhood evaporator case, and the high speed is fed directly from the horn relay through a 10-ga. red wire with an in-line fuseholder to a relay on the underhood evaporator case. No high blower with A/C is usually a blown in-line fuse or a bad relay.

:beer
 

walkman

Active member
Joined
Jul 9, 2003
Messages
33
Location
ca
Corvette
1971 Stingray Bridgehampton Blue
Ok, I have a/c. So should I look at the in line 25 amp fuse. where is the underhood evap. case.
 
Joined
Nov 23, 2002
Messages
1,060
Location
Motorcity USA
Corvette
1973 L-48 Coupe
Maybe its just mine, but i noticed when i put mine on high , it shuts off and when i shut it off it goes to high....it seems like the positions have "shifted" one whole notch , or something like that. Turn your engine off and really listen to it to be sure its off or on low...when my vette is running, i cant hear the blower motor to know if its running or not.
just a thought for ya...
Chas:_rock
 

LVMYVT76

Well-known member
Joined
Apr 21, 2006
Messages
664
Location
springfield, mo
Corvette
1976 medium blue
It is under your hood , on the firewall on the passenger side just in front of the wiper area. It has a large plug on top. the resistor has 2 screws holding it in place, take them out and lift it out,if the resister wires are burnt off, then it is bad.
 

walkman

Active member
Joined
Jul 9, 2003
Messages
33
Location
ca
Corvette
1971 Stingray Bridgehampton Blue
I'll correct myself, it's a 30 amp in-line fuse. It was popped, I'll change it today and see what happens.
 
G

George Black

Guest
JohnZ is 100% correct. If AC fan switch does not work on high, it is usually always the blown 30 amp in line fuse. Located on driver's side fender by horn relay. Red wire. Give us a report back if that fixes the problem.
 

walkman

Active member
Joined
Jul 9, 2003
Messages
33
Location
ca
Corvette
1971 Stingray Bridgehampton Blue
JohnZ is 100% correct. If AC fan switch does not work on high, it is usually always the blown 30 amp in line fuse. Located on driver's side fender by horn relay. Red wire. Give us a report back if that fixes the problem.
Yes it was the fuse. I think the relay/resistor is on passenger side where the a/c tubes go into the firewall area. The two relays/resistors up near the wiper motor on the drivers side, I'm not sure what they do. Unless I traced the wire wrong.
 

F4Gary

Well-known member
Joined
Jun 5, 2002
Messages
93
Location
Grapevine,Tx
Corvette
72 LT-1 conv w/fact air
When I put my AC fan switch to high, my ammeter pegs full right. Is that the switch or the resistor in the evap case?
 

walkman

Active member
Joined
Jul 9, 2003
Messages
33
Location
ca
Corvette
1971 Stingray Bridgehampton Blue
When I put my AC fan switch to high, my ammeter pegs full right. Is that the switch or the resistor in the evap case?
I don't know, you would have to take a volt/ohm meter and isolate. You have a short somewhere, could be in the blower motor.
 

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