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I have a 97 chevy camaro. The circiut breaker for the rear ...

Sent to Car Experts June 29 05:23 PM

I have a 97 chevy camaro. The circiut breaker for the rear defrost gets very hot and trips out when usind rear defrost. I have checked all connections, replaced the defrost switch but the problem still exists. I have 13.7 volts to the defroster element with the wire unhooked and 12.7 when the wire is reconnected. The elements in the glass all work and they appear in great shape. Where is the problem and what am I missing ? There seems to be high resistance somewhere in the circuit.

 

Optional Information:
1997 Chevrolet z28 camaro 350 lt1

Already Tried:
everything i can think of

Customer (name blocked for privacy)
Status:  Closed   Value: $12
Answer
June 29 9:28 PM (4 hours and 5 minutes and 18 seconds later)
         
REPLIEDCheck Mark

The problem you have is not high resistence but rather a short circuit, which is low resistence.

I would suspect the glass heater to be the problem but try unplugging the glass and see if it still blows the breaker. If not, then the heater is the problem. If it still blows, then your problem is in the relay, switch or wiring.



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Hammer Time -- L1 Master Technician -- 98% Positive Feedback on 2716 Car Accepts
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Reply
June 29 10:03 PM (34 minutes and 22 seconds later)
         
Reply to Hammer Time's Post: The breaker dosen't get hot or trip with the glass unpluged, but the glass itself appears to be in excellent, near new condition. How can that be the problem ? If the glass is good,. what resistance reading should I be getting across the elements ? Thanks- Jimmy
Customer (name blocked for privacy)
Answer
June 29 10:06 PM (3 minutes and 47 seconds later)
         
ACCEPTEDCheck Mark
There is no published spec for the heater resistence. If your using a good circuit breaker and it doesn't blow when the heater is unplugged, the glass is drawing too much current.

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Hammer Time -- L1 Master Technician -- 98% Positive Feedback on 2716 Car Accepts
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