Rear A/C Switch Burned Up

Rear A/C Switch Burned Up

Postby kramerhd [OP] » June 11th 2012, 2:13am

well today it finally happened. I've seen it before, but it finally happened to mine.
the switch got jammed slightly and then i smelled the burning smell.

So what is the root cause for this,(Beside the switch jamming.)

I've had to replace the relay a few times due to it get burned up. I've even reduced the fuse by 10amp.

I'm going to the local salvage yard to get a replacement harness and switch this week.

But what Is causing it to happen in the first place????
1999 GMC Safari AWD(138,000miles)
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Rear A/C switch
Original Poster [OP]
kramerhd
Fueling (1/2 tank)
Fueling (1/2 tank)
Years of Membership: kramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full years
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Van Model Year: 1999
Van Make/Model: GMC Safari
Extra Info: SLT AWD

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Re: Rear A/C Switch Burned Up

Postby tomasw » June 15th 2012, 7:58am

The problem is GM's scare of contact relays. If you lead 10 amp or more thru a tiny copper plate inbedded i plastic, you have got this problem if a minor rise in amps happens(or lack of voltage. 120watts /12v = 10amps but 120 watt / 10v = 12amp )
Then fry!!

And as allways, dont mind my english, im a swed

Hope nobody saw me killed ohms law erlier :)
1995 chevy astro LT AWD
1995 chevy astro AWD for spareparts
Oldsmobile Cutlass 1976, 455, T-top
Opel Omega 2.5, 1998 (Caddy Catera)
SAAB 9-5, 2.0t 2000
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Re: Rear A/C Switch Burned Up

Postby kramerhd [OP] » June 16th 2012, 3:18pm

So what can be done to correct this amp issue.?
Original Poster [OP]
kramerhd
Fueling (1/2 tank)
Fueling (1/2 tank)
Years of Membership: kramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full years
Posts: 53
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Images: 10
Joined: April 2012
Location: Texas
Gender: Male
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Van Model Year: 1999
Van Make/Model: GMC Safari
Extra Info: SLT AWD

Re: Rear A/C Switch Burned Up

Postby tomasw » June 16th 2012, 7:35pm

put a standard 12v car relay Image
It should be wired up with direkt battery voltage thru the contacts 30 and 87 and on off-regulations in coil-connections (85, 86)

I stole this from a site, it explain the baics, the blue whire in the pic is the on thats goes from the switch (and only gets some 80mA)
Image

how you should do the couplings in you car, it's up to you. I think that the most importent is to relay hi-speed on rear AC/heater (steals 13 amp I beleve). On ordinary heater/AC hi-speed all ready got a realy

I'm fighting with my own 1995 that have no volt at allto the rears.. I'm shure it will end up with a few relay and special connections when I'm ready....
1995 chevy astro LT AWD
1995 chevy astro AWD for spareparts
Oldsmobile Cutlass 1976, 455, T-top
Opel Omega 2.5, 1998 (Caddy Catera)
SAAB 9-5, 2.0t 2000
tomasw
Fueling (Empty tank)
Fueling (Empty tank)
Years of Membership: tomasw has been a member for 8 full yearstomasw has been a member for 8 full yearstomasw has been a member for 8 full yearstomasw has been a member for 8 full yearstomasw has been a member for 8 full yearstomasw has been a member for 8 full yearstomasw has been a member for 8 full yearstomasw has been a member for 8 full years
Posts: 10
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Images: 1
Joined: March 2012
Location: Sweden
Gender: Male
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Van Model Year: 1995
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Extra Info: 4.3 LT AWD

Re: Rear A/C Switch Burned Up

Postby kramerhd [OP] » October 13th 2012, 2:08pm

THE DAMN THING DID IT AGAIN!!!
(New switch and a new harness) :banghead:

Can someone show me what the (+) Neutral and Ground Wire is.

I would like to just wire in a Regular toggle switch.
Original Poster [OP]
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Fueling (1/2 tank)
Fueling (1/2 tank)
Years of Membership: kramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full years
Posts: 53
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Joined: April 2012
Location: Texas
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Van Model Year: 1999
Van Make/Model: GMC Safari
Extra Info: SLT AWD

Re: Rear A/C Switch Burned Up

Postby Lumpy » October 13th 2012, 2:49pm

Just curious, Kramer...

Why do you post in that giant purple font?


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Re: Rear A/C Switch Burned Up

Postby kramerhd [OP] » October 13th 2012, 3:51pm

Lumpy wrote:Just curious, Kramer...

Why do you post in that giant purple font?


Lump

For ****'z-n-Giggle :confused:
Original Poster [OP]
kramerhd
Fueling (1/2 tank)
Fueling (1/2 tank)
Years of Membership: kramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full yearskramerhd has been a member for 8 full years
Posts: 53
Topics: 7
Images: 10
Joined: April 2012
Location: Texas
Gender: Male
Alias (AKA): Kramerhd
Van Model Year: 1999
Van Make/Model: GMC Safari
Extra Info: SLT AWD


 
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