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Username Post: 63 Impala AC blower issue        (Topic#351988)
ampico-kid 
Poster
Posts: 79

Reg: 07-12-17
07-12-18 03:14 PM - Post#2739792    

I have a 1963 Impala with factory Deluxe All Weather AC. It's been working fine until today. The blower system works good with the AC off. I get low, medium, and high speeds (blower resistors are fine). When the AC is switched on I only have high speed, the lower speeds are dead. Not sure where to start looking. Hoping it's not behind the glove box (that thing was a bear to get in there). Any advice is welcomed....thanks. Bob



 




Mercedes 
Contributor
Posts: 189

Reg: 07-09-18
07-12-18 04:45 PM - Post#2739798    
    In response to ampico-kid

There really isn't a whole lot to this circuit. I wouldn't think that moving the selector switch would change how the blower speed works, but I could be wrong.

Check to make sure that nothing is binding. I would think that the blower speeds are controlled by the switch and resistor regardless of position.



 
ampico-kid 
Poster
Posts: 79

Reg: 07-12-17
07-12-18 06:32 PM - Post#2739810    
    In response to Mercedes

  • Mercedes Said:
There really isn't a whole lot to this circuit. I wouldn't think that moving the selector switch would change how the blower speed works, but I could be wrong.

Check to make sure that nothing is binding. I would think that the blower speeds are controlled by the switch and resistor regardless of position.


It's not quite that simple. In the AC position the normal "off" position of the blower speed selector is low speed. There has to be some sort of a switchover from standard blower function to AC function, I just don't know where that switchover happens.



 
models916 
Valued Contributor
Posts: 4785

Age: 67
Loc: Addison, IL
Reg: 05-28-10
07-13-18 03:59 AM - Post#2739823    
    In response to ampico-kid

Did you check the fuse box. Is it the same fuse for the heater?



 
ampico-kid 
Poster
Posts: 79

Reg: 07-12-17
07-13-18 06:22 AM - Post#2739838    
    In response to models916

  • models916 Said:
Did you check the fuse box. Is it the same fuse for the heater?



Same Fuse for both.



 
acardon 
Ultra Senior Member
Posts: 11084
acardon
Loc: DFW TEXAS
Reg: 03-25-05
07-13-18 10:46 AM - Post#2739869    
    In response to ampico-kid

There is a switch on the A/C Heater control that redirects power to the resistors and motor. See page 15-34 and 15-35.

Link to A/C manual

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


 
ampico-kid 
Poster
Posts: 79

Reg: 07-12-17
07-13-18 02:17 PM - Post#2739896    
    In response to acardon

  • acardon Said:
There is a switch on the A/C Heater control that redirects power to the resistors and motor. See page 15-34 and 15-35.

Link to A/C manual



Thanks for the information and the link. Great minds must think alike. I dug out my assembly manual and found the same page that you mentioned in the link. I was really hoping that the switch was not the problem. It's in the worst possible spot to get at, but....I bit the bullet and removed it. It was definitely the switch. The grease inside of it had congealed and prevented the pressure plate from pressing against the switch contacts inside. I cleaned and relubed it and now it works as it should. Thanks for the guidance. It's always appreciated.



 




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