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Username Post: AC & heater        (Topic#350217)
Andy4639 
Frequent Contributor
Posts: 1384

Age: 59
Loc: Liberty, SC
Reg: 08-06-16
03-21-18 08:41 AM - Post#2728407    

Can some one explain the blower motor wiring to me. I have it working but I don't think the fan is getting high speed! It is just a small amount of air coming out of the vents which is about the same no matter what the speed setting is. I have the schematic but....
The 2 orange wires coming off the fan switch ones goes to the heater coil the other goes through the fuse block and to the fan motor. ???????
The ac gets down to 36-40* with no problems it just seems it doesn't have the speed for the fan.



1956 Bel Air - LT-1/4l60
1964 SS Impala -350 crate/powerglide
1967 Ramp truck - 350/ 4 speed
1971 C 10 - 6.0 LS / 4l80e 4:10 gears 30 years owner
94 Elderado
2000 S-10
2008 LTZ Tahoe
2011 Treverse


 


55Brodie 
Contributor
Posts: 283
55Brodie
Age: 67
Loc: Little River, SC
Reg: 12-26-15
03-21-18 09:05 AM - Post#2728409    
    In response to Andy4639

If it is the factory blower I would suspect the resistor coil is shot. Pretty common fault.



 
55Brodie 
Contributor
Posts: 283
55Brodie
Age: 67
Loc: Little River, SC
Reg: 12-26-15
03-21-18 09:09 AM - Post#2728410    
    In response to 55Brodie

http://www.impalas.com/1961-64-impala-air-co nditio...



 
acardon 
Ultra Senior Member
Posts: 11298
acardon
Loc: DFW TEXAS
Reg: 03-25-05
03-21-18 09:59 AM - Post#2728412    
    In response to Andy4639

High speed doesn't run through the resistors. High speed has a relay to supply full voltage to the fan motor. Link to fan relay.

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


 
Tri5man 
Valued Contributor
Posts: 3794
Tri5man
Loc: Possums Crotch, KY
Reg: 06-26-07
03-21-18 11:08 AM - Post#2728419    
    In response to acardon

Doubt the fan relay is the problem as the A/C output is normal. Per Andy the A/C cools to 36-40%. Also the link to the relay description states the A/C will be inoperative which its not.



 
Andy4639 
Frequent Contributor
Posts: 1384

Age: 59
Loc: Liberty, SC
Reg: 08-06-16
03-21-18 11:17 AM - Post#2728421    
    In response to Tri5man

Yes it cools down fine it just doesn't seem to have the high fan speed.
I have jumped the fan out before straight to the battery and it seemed to run fine with no noise. I didn't get in the car though and see if it put out a bunch of air through the vents! I just wanted to make sure it ran. The wiring was not hooked up at the time.
Where is that relay located behind the glove box?
I think I replaced it when I did the resistors.



1956 Bel Air - LT-1/4l60
1964 SS Impala -350 crate/powerglide
1967 Ramp truck - 350/ 4 speed
1971 C 10 - 6.0 LS / 4l80e 4:10 gears 30 years owner
94 Elderado
2000 S-10
2008 LTZ Tahoe
2011 Treverse


Edited by Andy4639 on 03-21-18 11:23 AM. Reason for edit: No reason given.

 
acardon 
Ultra Senior Member
Posts: 11298
acardon
Loc: DFW TEXAS
Reg: 03-25-05
03-21-18 12:18 PM - Post#2728427    
    In response to Andy4639

Compressor clutch power does not go through the relay. Full 12 volts from the starter goes through the relay to the fan motor when Hi speed is selected. Lower speeds go through the resistors. I think the relay is mounted on the side of the blower housing under the hood. I think there is an inline fuse or CB in the power to the relay.
If the blower motor needs lubricating, it can bind, and cause exce3ssive current draw, which can blow the fuse.

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


Edited by acardon on 03-21-18 12:20 PM. Reason for edit: No reason given.

 
Tri5man 
Valued Contributor
Posts: 3794
Tri5man
Loc: Possums Crotch, KY
Reg: 06-26-07
03-21-18 03:18 PM - Post#2728444    
    In response to acardon

Andy, keep us posted on your progress. I'm interested in your findings about the fan speeds.

Gary



 
Andy4639 
Frequent Contributor
Posts: 1384

Age: 59
Loc: Liberty, SC
Reg: 08-06-16
03-21-18 04:50 PM - Post#2728457    
    In response to Tri5man

How does ya'll fan blow on high? Mine doesn't have much volume to it. It feels like medium maybe. I have to put my hand right in front of the center vent to feel it.
Compared to my 71 C10 with factory style AC it is on low setting.
The temperature is as stated 36-40* just can't feel the air moving.
It cools down but it takes a while with such little air blowing into the vehicle.



1956 Bel Air - LT-1/4l60
1964 SS Impala -350 crate/powerglide
1967 Ramp truck - 350/ 4 speed
1971 C 10 - 6.0 LS / 4l80e 4:10 gears 30 years owner
94 Elderado
2000 S-10
2008 LTZ Tahoe
2011 Treverse


 
acardon 
Ultra Senior Member
Posts: 11298
acardon
Loc: DFW TEXAS
Reg: 03-25-05
03-21-18 05:08 PM - Post#2728460    
    In response to Andy4639

Didn't you say the fan ran faster when you jumpered 12 volts directly to the motor? That tells me the relay isn't supplying full voltage in hi speed. Relay on firewall, next to A/C housing.


Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


Edited by acardon on 03-21-18 05:15 PM. Reason for edit: No reason given.

 
junky 
Valued Contributor
Posts: 3160

Loc: Northeast CT
Reg: 06-27-10
03-21-18 05:19 PM - Post#2728462    
    In response to Andy4639

Can't say anything definitive about the full size cars, however, my 1962 Chevrolet Corvair has a relay that prevents the fan from going to the high position, if the cars high beam headlamps are on. The control for the relay is connected to the headlamp dimmer switch. It is a yellow wire. This may or may not be of any value to you in resolving your problem.

Never argue with an idiot. He'll drag you down to his level, then beat you with experience.


 
Andy4639 
Frequent Contributor
Posts: 1384

Age: 59
Loc: Liberty, SC
Reg: 08-06-16
03-22-18 02:32 AM - Post#2728479    
    In response to acardon

  • acardon Said:
Didn't you say the fan ran faster when you jumpered 12 volts directly to the motor? That tells me the relay isn't supplying full voltage in hi speed. Relay on firewall, next to A/C housing.




Yes that's correct and what I'm thinking also. I would like to know how the relay gets the high speed feed though.
Do any of you have a good picture of the fan speed switch wiring? I'm going to take it a part this weekend and try to figure out what is going on.
I haven't found a schematic yet that shows the AC relay.
After some google searches, I have found some good info. It was right here all the time!


https://www.chevytalk.org/fusionbb/showtopic.php?fi...


1956 Bel Air - LT-1/4l60
1964 SS Impala -350 crate/powerglide
1967 Ramp truck - 350/ 4 speed
1971 C 10 - 6.0 LS / 4l80e 4:10 gears 30 years owner
94 Elderado
2000 S-10
2008 LTZ Tahoe
2011 Treverse


Edited by Andy4639 on 03-22-18 06:21 AM. Reason for edit: No reason given.

 
acardon 
Ultra Senior Member
Posts: 11298
acardon
Loc: DFW TEXAS
Reg: 03-25-05
03-22-18 06:07 AM - Post#2728488    
    In response to Andy4639

Before taking it apart, diagnose the problem. Have someone turn the A/C switch on and off to hi speed while listening or feeling the relay click. If it doesn't click, check the green wire on the relay with the switch in hi speed. The green wire provides 12 volts from the switch.
If it does click, check for voltage on the gray wire on the relay. It should be 12 volts all the time. It's connected to the battery terminal of the starter solenoid.

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


Edited by acardon on 03-22-18 06:07 AM. Reason for edit: No reason given.

 
Andy4639 
Frequent Contributor
Posts: 1384

Age: 59
Loc: Liberty, SC
Reg: 08-06-16
03-22-18 06:25 AM - Post#2728492    
    In response to acardon

  • acardon Said:
Before taking it apart, diagnose the problem. Have someone turn the A/C switch on and off to hi speed while listening or feeling the relay click. If it doesn't click, check the green wire on the relay with the switch in hi speed. The green wire provides 12 volts from the switch.
If it does click, check for voltage on the gray wire on the relay. It should be 12 volts all the time. It's connected to the battery terminal of the starter solenoid.



Thanks, I will do this. Non of the schematic's I look at show any green wires to relay are to motor.
My searching has led me to think my fan switch wiring is backwards though. From the schematics & my pictures I took of the connections at the fan switch the brown feed wire and the black & orange wires are backwards on the connector.



1956 Bel Air - LT-1/4l60
1964 SS Impala -350 crate/powerglide
1967 Ramp truck - 350/ 4 speed
1971 C 10 - 6.0 LS / 4l80e 4:10 gears 30 years owner
94 Elderado
2000 S-10
2008 LTZ Tahoe
2011 Treverse


Edited by Andy4639 on 03-22-18 06:27 AM. Reason for edit: No reason given.

 
Andy4639 
Frequent Contributor
Posts: 1384

Age: 59
Loc: Liberty, SC
Reg: 08-06-16
03-22-18 05:16 PM - Post#2728568    
    In response to Andy4639

I had to go to O Reilly's and get some parts for the ramp truck. Spark plugs, I broke one removing the exhaust manifolds. While I was there I picked up a MP-102 fan motor for $20.00 with life time warrinty.
I hope to get started on it by tomorrow night.

Got to finish up the ramp truck manifolds first though! They have fought me the whole time.
I'll keep everyone posted.



1956 Bel Air - LT-1/4l60
1964 SS Impala -350 crate/powerglide
1967 Ramp truck - 350/ 4 speed
1971 C 10 - 6.0 LS / 4l80e 4:10 gears 30 years owner
94 Elderado
2000 S-10
2008 LTZ Tahoe
2011 Treverse


 
62chevy427 
"12th Year" Silver Supporting Member
Posts: 2166
62chevy427
Loc: laurens sc
Reg: 04-13-06
03-22-18 07:45 PM - Post#2728593    
    In response to Andy4639

i worked on a 72 truck recently and mice had built a nest in the ducts. very little air flow. after confirming that the blower motor was running at full speed, i cleaned the ducts out. got 2 or 3 handfuls of stuff. works good now. took several hours to get all the stuff out.

56 bel air ((since 2002)
62 impala ss (since 1965)
65 el camino (since 1969)
66 nova (since 1987)
67 malibu convertible (since 1981)
72 el camino ss454 (since 1985)
83 gmc 4wd (since 1991)
95 impala (new)
15 chevy equinox



 
Andy4639 
Frequent Contributor
Posts: 1384

Age: 59
Loc: Liberty, SC
Reg: 08-06-16
03-23-18 04:54 PM - Post#2728699    
    In response to 62chevy427

Well all is well with the AC blower motor now.

I took the radio out to get to the switch. When I went to pull the connector off the whole backside of the ac switch came off with the connector. So took the whole unit out took the switch off and put it back together. The brown & orange wires where swapped. I swapped them back and the fan ran on high speed. I went a head and put the new motor in also just because I had it. You can feel the cold air now just sitting in the seat.



1956 Bel Air - LT-1/4l60
1964 SS Impala -350 crate/powerglide
1967 Ramp truck - 350/ 4 speed
1971 C 10 - 6.0 LS / 4l80e 4:10 gears 30 years owner
94 Elderado
2000 S-10
2008 LTZ Tahoe
2011 Treverse


 
kingkreeton 
"6th Year" Silver Supporting Member
Posts: 1336
kingkreeton
Loc: Houston TX
Reg: 04-15-11
03-24-18 07:54 AM - Post#2728768    
    In response to Andy4639

Nice

Shane
64 Impala SS:
Chevy Performance 350HO
4 Speed Muncie

Proud member of Big Blue Nation, University of Kentucky Basketball. "Go Big Blue"


 
Andy4639 
Frequent Contributor
Posts: 1384

Age: 59
Loc: Liberty, SC
Reg: 08-06-16
03-28-18 07:05 AM - Post#2729208    
    In response to kingkreeton

It's been either raining are to dang cold to try it out but hopefully this weekend it will get used, suppose to be in the 70' the rest of the week.




1956 Bel Air - LT-1/4l60
1964 SS Impala -350 crate/powerglide
1967 Ramp truck - 350/ 4 speed
1971 C 10 - 6.0 LS / 4l80e 4:10 gears 30 years owner
94 Elderado
2000 S-10
2008 LTZ Tahoe
2011 Treverse


 
Andy4639 
Frequent Contributor
Posts: 1384

Age: 59
Loc: Liberty, SC
Reg: 08-06-16
07-13-19 07:47 PM - Post#2770644    
    In response to Andy4639

A little info on the AC in the 64.

I drove the 64 up to my dad's to work on his 56 Bel Air rear brakes. I bought a box of glass fuses a while back off E Bay for like $4.00 for a box of multi size fuses 60 of them. I went through 4 30amp fuses yesterday on the way up to my dad's. Ac ran normally but every time I stopped and restarted the car the fuse would blow. I just figured I'd look at it when I got to my dad's, I couldn't find anything wrong except the all the fuses where burnt on one end and non of them where blown! Dad and I decided to buy a pack of fuses at NAPA. I'm still on the same fuse and I have drove back home and cut the car off a half dozen times.
Anyway cheap as fuses cost me a few hot minutes on the side of the road to stop and replace the dang fuses.


1956 Bel Air - LT-1/4l60
1964 SS Impala -350 crate/powerglide
1967 Ramp truck - 350/ 4 speed
1971 C 10 - 6.0 LS / 4l80e 4:10 gears 30 years owner
94 Elderado
2000 S-10
2008 LTZ Tahoe
2011 Treverse


 
junky 
Valued Contributor
Posts: 3160

Loc: Northeast CT
Reg: 06-27-10
07-14-19 03:53 AM - Post#2770653    
    In response to Andy4639

Poorly manufactured in some obscure country far away, where labor is cheap, and cheap materials are used. I only buy NOS fuses at the swap meets, because not only are they inexpensive, but they are USA made.

Never argue with an idiot. He'll drag you down to his level, then beat you with experience.


 
Andy4639 
Frequent Contributor
Posts: 1384

Age: 59
Loc: Liberty, SC
Reg: 08-06-16
07-18-19 07:33 PM - Post#2771032    
    In response to junky

I want be using any more of them unless it's a have to, I'll be buying mine from NAPA for now on.


1956 Bel Air - LT-1/4l60
1964 SS Impala -350 crate/powerglide
1967 Ramp truck - 350/ 4 speed
1971 C 10 - 6.0 LS / 4l80e 4:10 gears 30 years owner
94 Elderado
2000 S-10
2008 LTZ Tahoe
2011 Treverse


 


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