C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

85 AC not Blowing

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Old May 14, 2015 | 12:45 PM
  #1  
FC_Smith's Avatar
FC_Smith
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From: Norfolk VA
Default 85 AC not Blowing

I've always loved reading peoples problems get fixed on this site, so heres hoping someone can point me in the right direction on mine.

I have a 85 vette thats AC/ Heat does not blow. I have power to the consol as i can see the defrost light come on when i turn it to on, i also see a vent open in the back when i remove the front panel and look down my vent and cycle threw the different options for where the air will blow. No fuses are blown i checked them all. I've looked for a while at this taken the radio out and checked the connections in the back many times. No idea where to go from here.
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Old May 14, 2015 | 01:53 PM
  #2  
70ZZ3 96LT4's Avatar
70ZZ3 96LT4
Burning Brakes
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From: TN
Default no blower motor action

Originally Posted by FC_Smith
I've always loved reading peoples problems get fixed on this site, so heres hoping someone can point me in the right direction on mine.

I have a 85 vette thats AC/ Heat does not blow. I have power to the consol as i can see the defrost light come on when i turn it to on, i also see a vent open in the back when i remove the front panel and look down my vent and cycle threw the different options for where the air will blow. No fuses are blown i checked them all. I've looked for a while at this taken the radio out and checked the connections in the back many times. No idea where to go from here.
You could run a twelve volt wire connection from the positive side of the battery to the blower motor connection and see if the blower motor will function.
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Old May 14, 2015 | 01:55 PM
  #3  
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Start with the easy things first but it may be the A/C, heater control head.
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Old May 15, 2015 | 12:47 AM
  #4  
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Cliff Harris
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From: Anaheim CA
Default

You might have a blown A/C fuse.

Usually if one of the resistors is open then some fan speeds will work and others will not, so the resistor network does not seem to be your problem. In any case the fan should work on high speed because that is controlled by the fan relay, which bypasses the resistor network.

This diagram might help:

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