AC not working

[comngroundsaudio]

hey all, i did my searching before posting.. i dont know what the deal is with my ac.

 

problem as follows...

 

i had a burnt out AC switch, so, i bought a brand new one to fix this problem. i assumed it was just old and time for it to burn up.

 

anyhow, long story short. i checked all the fuses and relay... i did all the trouble shooting i could as far as connecting battery to compressor, clutch engaged.

when i hooked up my BRAND NEW switch, turned it on, i smelled electronics.. yea, i was getting upset considering i paid $100 for this switch.

 

i have gone through the haynes book electrical diagram... it has helped some but, i have no idea what would cause it to burn up a switch. any ideas?

 

my GUESSES are narrowed down as follows..

Here’s what I have narrowed it down to...

 

-ac low pressure cutout switch

-ac high pressure cutout switch

-ac compressor cycling switch

i have no clue where these things are or i would have already checked them.. if i knew how to?

 

1997 GMC Suburban

5.7 4x4

dual AC

 

Thank you all in advance.

[ken1mod]

None of the items you listed could cause excess current/switch burnout. Probably a wiring short to ground.

 

Do not just throw money at this problem. I always run out of money before problem.

 

ken

[carneyman]

None of the items you listed could cause excess current/switch burnout.  Probably a wiring short to ground.

 

Do not just throw money at this problem.  I always run out of money before problem.

 

ken

 

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I agree. I had a/c trouble last summer, no fun.

 

My truck never catches the money I throw at it...

[96 Vortec]

When you say the A/C switch burned up, are you referring to the fan/temp/position controls?

 

I have a fan switch that burned out and I replaced the whole assembly for $100. Two years later the wire harness to the blower motor behind the glovebox melted and shorted out the system. I cut that out and connected the wires using insulated disconnects. All is well until one year later (4 months ago) the fan switch started losing speeds one at a time until they were all gone. I found out you can disassemble the control box and replace the fan switch for $15. All is well again.

[comngroundsaudio]

yes. the one under the radio. (just making clear)

 

i do appreciate everyones help on this!

Thank you.

 

When you say the A/C switch burned up, are you referring to the fan/temp/position controls?

 

I have a fan switch that burned out and I replaced the whole assembly for $100.  Two years later the wire harness to the blower motor behind the glovebox melted and shorted out the system.  I cut that out and connected the wires using insulated disconnects.  All is well until one year later (4 months ago) the fan switch started losing speeds one at a time until they were all gone.  I found out you can disassemble the control box and replace the fan switch for $15.  All is well again.

 

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