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I just bought a 1966 Coupe with Factory AC and need some information or trouble shooting for my AC. The blower motor is not working. Where should I start? It appears that the inline fuse (30A) is good. Where is the blower motor located, inside engine compartment or under dash?
The Car is a factory AC, PW, PS and PB car. 327/300 hp with Powerglide. All number matching. However, it has a Holley EFI Stealth Ram System and Billet Specialties serpentine system. I am looking to sell the motor and trans etc. any idea of what they would sell for? All have been completely rebuilt and have 350 miles on them
The blower is on the firewall side of the engine compartment tucked under the fender area. And why in the world would you sell the numbers matching engine.
You say the fuse "appears" to be ok. Measure it, or change it. Or, check on both sides of it for 12v with the ground on a chassis ground. One common cause of no blower motor is the ground wire that comes from the windshield wiper motor and clips onto the blower motor case and then goes down to one of the starter motor mounting bolts for a ground. That black wire must connect to the lug on the case of the blower motor under the hood and must be connected to the starter bolt. (it has a ring terminal and the wire is black) That ground being off at the starter will cause both the fan and the wipers not to work, if it's off at the blower, the fan won't run. To test, connect a jumper from the case of the blower to the engine, (or battery negative if you like), and see if the fan runs.
Here is the 66 with a/c diagram. Look at the upper right corner for the a/c connections. Note the black wire from the wipers to the fan, to the starter bolt.
My car is a/c and has the same ground as I described above. It has a separate power plug, but the ground is the same.
From what I remember in the separate AC harness there is a dedicated ground wire that needs grounded as well. Along with the ground on the AC blower high speed relay
You say the fuse "appears" to be ok. Measure it, or change it. Or, check on both sides of it for 12v with the ground on a chassis ground. One common cause of no blower motor is the ground wire that comes from the windshield wiper motor and clips onto the blower motor case and then goes down to one of the starter motor mounting bolts for a ground. That black wire must connect to the lug on the case of the blower motor under the hood and must be connected to the starter bolt. (it has a ring terminal and the wire is black) That ground being off at the starter will cause both the fan and the wipers not to work, if it's off at the blower, the fan won't run. To test, connect a jumper from the case of the blower to the engine, (or battery negative if you like), and see if the fan runs.
I just bought a 1966 Coupe with Factory AC and need some information or trouble shooting for my AC. The blower motor is not working. Where should I start? It appears that the inline fuse (30A) is good. Where is the blower motor located, inside engine compartment or under dash?
The Car is a factory AC, PW, PS and PB car. 327/300 hp with Powerglide. All number matching. However, it has a Holley EFI Stealth Ram System and Billet Specialties serpentine system. I am looking to sell the motor and trans etc. any idea of what they would sell for? All have been completely rebuilt and have 350 miles on them
Did you check the heater fuse (second from top) in the fuse box?
You say the fuse "appears" to be ok. Measure it, or change it. Or, check on both sides of it for 12v with the ground on a chassis ground. One common cause of no blower motor is the ground wire that comes from the windshield wiper motor and clips onto the blower motor case and then goes down to one of the starter motor mounting bolts for a ground. That black wire must connect to the lug on the case of the blower motor under the hood and must be connected to the starter bolt. (it has a ring terminal and the wire is black) That ground being off at the starter will cause both the fan and the wipers not to work, if it's off at the blower, the fan won't run. To test, connect a jumper from the case of the blower to the engine, (or battery negative if you like), and see if the fan runs.
Not to hijack but does this ground continuity apply for non AC heater motors?
Thanks. This might be the issue I'm having with both my heater motor and wiper motor. Neither work after a rebuild. I've got another thread about same. Thanks again; I'll check out the ground.
(if I might add); this fuse should be 30 amp on C60 cars, not the 10 amp for regular production.
ref: '65 AIM UPC C60, sheet E2, item 6.
The 30 amp fuse is inline under the hood on a/c cars. It is still a 10a fuse in the fuse box for the fan motor (marked "heater"). The non-a/c cars don't have the 30a inline fuse that feeds the a/c relay, but both have the 10a in the fuse box.
The 30 amp fuse is inline under the hood on a/c cars. It is still a 10a fuse in the fuse box for the fan motor (marked "heater"). The non-a/c cars don't have the 30a inline fuse that feeds the a/c relay, but both have the 10a in the fuse box.
What you say contradicts the AIM reference I gave. There has to be some reason why they say to replace the 10 amp with a 30. Maybe it's the extra current draw of the compressor clutch coil under low and medium fan speeds when the A/C is being used. Don't forget that the only time there is current flow through that in-line fuse is when blower motor is turned to high, whether A/C is on or off.
Flash: just looking at '65 shop manual supplement, page 13-45, where they describe fuses used in the Corvette air conditioning system.
1. System protection is provided by a 3AG20 fuse in the fuse panel attached to the passenger side of the firewall in front of the driver's seat.
2. High speed blower motor protection is provided by a 3AG30 in-line fuse located in the wiring over the evaporator case in the engine compartment.
I got the 30 amp fuse rating from the P&A30, group 8.965 where it lists 120114 (shown on AIM) as being rated at 30 amps.
Last edited by midstyle; 09-13-2015 at 04:29 PM.
Reason: added amp rating of fuse part #
Shazam! Your post to this thread and a little bit of follow up lead me to the solution of the last 2 issues I had with my rebuild. The wiper motor and blower motor didn't work in spite of being rebuilt and connected. The ground wire to the battery (-) wasn't connected correctly. I had it connected to the solenoid big terminal . Once I figgered that out with the wiring diagram and your information, I made the correction. Now both motors work and I'm a very happy camper. Thanks!
What you say contradicts the AIM reference I gave. There has to be some reason why they say to replace the 10 amp with a 30. Maybe it's the extra current draw of the compressor clutch coil under low and medium fan speeds when the A/C is being used. Don't forget that the only time there is current flow through that in-line fuse is when blower motor is turned to high, whether A/C is on or off.
Flash: just looking at '65 shop manual supplement, page 13-45, where they describe fuses used in the Corvette air conditioning system.
1. System protection is provided by a 3AG20 fuse in the fuse panel attached to the passenger side of the firewall in front of the driver's seat.
2. High speed blower motor protection is provided by a 3AG30 in-line fuse located in the wiring over the evaporator case in the engine compartment.
I got the 30 amp fuse rating from the P&A30, group 8.965 where it lists 120114 (shown on AIM) as being rated at 30 amps.
The 30a fuse protects the a/c relay. I'm not sure if it also protects the fan, possibly on the purple wire. I posted the a/c diagram. Here's the non-a/c diagram. My a/c car still has the 10A fuse in the heater position. It feeds the fan switch, which controls the a/c relay, which is protected by the 30a in line fuse.
To the OP, follow the diagram and verify voltage and ground, you'll find the problem. The circuit is fairly simple, although it wasn't the best way to wire it.
65GGvert.... In your A/C wiring diagram, I see where the compressor is grounded apparently through a mounting bracket bolt, but where does the compressor get its hot lead?
65GGvert.... In your A/C wiring diagram, I see where the compressor is grounded apparently through a mounting bracket bolt, but where does the compressor get its hot lead?
The two plug terminal that plugs in behind the clutch
65GGvert.... In your A/C wiring diagram, I see where the compressor is grounded apparently through a mounting bracket bolt, but where does the compressor get its hot lead?
The dark green wire that plugs into the compressor connector is the 12v from the a/c switch shown by the fan control on the diagram. The compressor body provides the ground, there is no ground wire to the compressor. The 30a inline fuse is between the red wire on the horn relay and the a/c relay.
09-13-2015, 07:57 AM
1966 Coupe AC Blower
. Once I figgered that out with the wiring diagram and your information, I made the correction. Now both motors work and I'm a very happy camper. Thanks!
