IrishJoker

1981 Corvette:

I am having an issue with the High Speed Blower Switch:

I can tell no difference between position 3 and position 4 of the Fan switch. Therefore I believe I have a high speed blower issue.

According to information on page 1B-20 of the Shop Manual there are two fuses for the air conditioning system: 1 fuse in the fuse block and 1 fuse protecting the high speed blower circuit.

This fuse is supposed to be located in the electrical wiring between the "Junction terminal" and the Air Conditioning relay.
Additionally there is a RELAY and a Blower Resistor involved.

By the way, I do not see this 2nd fuse in the wiring diagram, which is "Fig 1B-3-C60" on page 1B-3.

My questions are as follows:

1. Where is the Relay located?

2. Where is the fuse located?

3. Where is the Resistor located?

I am making an assumption that since the A/C works and the Fan/Blower switch works in the lower 3 positions, something has happened in any of the 3 components listed above.

The Shop Manual talks about replacing all 3 of these components but does not provide a picture diagram of where they are located. See pages 1B-20 and 1B-21.

I would appreciate any help anyone can provide.

rayluka

This is for the high speed on a 76

IrishJoker

Thanks for pointing out the fuses - is that the High Speed blower relay between the two?

SIXFOOTER

On the 81 the relay HIGH is fed bt a fuse link on the starter, red wire comes up in the bundle and feeds the relay from there

72LS1Vette

That looks like an aftermarket fuse holder added into the circuit. It would be unusual to see crimp-on connectors in a factory circuit. The fuse may have been added to replace a damaged fusible link. A better idea IMO since they are easier to fix.



Rick B.

...Roger...

Probably just a bad high speed blower relay.At the relay make sure you have power on the 12 red and the 16 orange when you have the blower switch in the high position.(key on)If you do then replace the relay or check and clean the terminals.

babylonvette

i just went through the same thing on my 72 a/c coupe it was the blower switch everthing worked fine but would lose power to blower when put in 4 speed high,yes it does have 4 speeds i looked in owners manual i thought the switch was just loose

AimHigh

IrishJoker

Thanks for the information - the question remains - where is the HIGH SPEED BLOWER Relay located on an 81????????

...Roger...

Jeeeze you dont have to yell,you are one very demanding person.
In your 81 shop manual go to page 8A-70 Fig. 8A-73 and look for the little blue box in the pic labeled "BLOWER RELAY"

IrishJoker

Sorry didn't concider that yelling - just that the original question wasn't being answered. Wire diagrams don't show location generally.

What's demaning? Everyone here generally asks a question - isn't that the point? I didn't "DEMAND" that you answer anything. If you choose to respond to the thread that's your business.

rayluka

It is aftermarket. That was after my repair.

...Roger...

Just saw your response on this one Irish.
Man I was only joking with you,if I was serious I wouldnt have taken the time to look it up in the manual for you.Sorry if I came across wrong and I hope you got your problem fixed.