1994 Cavalier rear defroster Question - Chevelle Tech
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post #1 of 6 (permalink) Old Sep 2nd, 19, 3:58 PM Thread Starter
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1994 Cavalier rear defroster Question

I have found another 1994 Cavalier and bought it..but it doesn't have a defroster..My question is can I use the old defroster control panel from my wrecked car..and use the defroster button to control a defroster you place in the rear window shelf that is powered by the cig lighter cord..connecting it to the defrost switch?

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post #2 of 6 (permalink) Old Sep 2nd, 19, 4:37 PM
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Re: 1994 Cavalier rear defroster Question

If the switch is latching (not a momentary switch but an On/Off style) and the switch can handle the amperage of the defroster motor, then it should be fine.

If the switch is momentary, then additional parts such as a latching circuit would be required. If the switch cannot handle the amperage of the defroster motor, then a relay needs to be used.

Jim

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post #3 of 6 (permalink) Old Sep 2nd, 19, 6:09 PM Thread Starter
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Re: 1994 Cavalier rear defroster Question

if you push the switch the defroster comes on for 10 minutes then goes off..should I try to wire a separate switch with perhaps a fuse?


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Originally Posted by Jim Streib View Post
If the switch is latching (not a momentary switch but an On/Off style) and the switch can handle the amperage of the defroster motor, then it should be fine.

If the switch is momentary, then additional parts such as a latching circuit would be required. If the switch cannot handle the amperage of the defroster motor, then a relay needs to be used.

Jim

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post #4 of 6 (permalink) Old Sep 2nd, 19, 7:21 PM
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Re: 1994 Cavalier rear defroster Question

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Originally Posted by Bandit1978 View Post
if you push the switch the defroster comes on for 10 minutes then goes off..should I try to wire a separate switch with perhaps a fuse?
You can certainly go with a basic separate basic switch that can handle the defroster motors amperage.

Having a fuse in the proper spot is a good thing to have in place.

It's hard telling how much the stock switch and circuitry can handle but maybe see if the output is 12V and if it goes off after 10 minutes, then maybe wire in a basic relay to it. The relay would then get power from some other fused and properly sized accessory or battery circuit to then power the defroster motor.

Jim

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post #5 of 6 (permalink) Old Sep 2nd, 19, 10:05 PM
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Re: 1994 Cavalier rear defroster Question

I think the car has a grid on the rear glass!!

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post #6 of 6 (permalink) Old Sep 2nd, 19, 11:05 PM
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Re: 1994 Cavalier rear defroster Question

HAD a grid on the rear window!!

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