is there any harm in disconnecting the harness to the a/c compressor for the winter,iam not convinced that that i need it going on and off all the time,i want to know if it will discharge or go stale or anything like that ?

 

you should be fine doing it

you might have to recharge in the spring

 

so why are you disconnecting it?

 

decreases fuel economy in cold weather

 

how? if its off there is no drag. the clutch it free wheeling unless its locked up or bad bearing,

 

Plus when you have the truck on Defrost, Floor/Vent, and Defrost/Floor settings on the HVAC it runs the A/C compressor to remove moisture from the cab to defog/frost your windows quickly. Try it out while its hot out and the temp setting on cold. You'll notice that on any setting besides just dash vents and floor the air will get cold. Otherwise, the compressor is off and just free wheeling...no loss of MPG.

 

i find that on any setting of the heat control (except off) the compressor goes on and off,when it turns on i can feel it in the performance of the engine,you know with a little 3.0 any drag means a loss of mpg

 

also if it does need recharge can i just use one of those parts stores recharge kit ?

 

Floor only and vent only it should not run.

I like the fact i can defrost my windows quicker when its not freezing out. i really dont like to run my heat on a hot setting.

Since doing the EATC though I can turn the compressor off from inside.

If you wire up a switch on the purple wire off the controls you can do the same thing.


The recharge kit for the auto parts store will do the job. The issue is that the oil running though keeps the seals from drying out and leaking. Not sure what is true. I just run it all year if my windows fog up.

 

I wired in a switch into the wire as suggested and I turn it on once and a while just to keep the fluids flowing to keep the seals from drying out. It's hard to remember, but I try to turn it on for a few minutes at least once a week.
...Terry
ps. it is not the purple wire in a '08, they changed the color of the wire. I wrote the color down, if anyone wants, I'll find my notes.

 

keeping the compressor on all the time will make pressures high cause it to discharge to the atmostsphere, thus the reason for low and high cut off switches.

 

look in the how-to's and it called like G&M ac mod or something....i think its on the second page....

 

I think you misunderstood what wire I was talking about. Putting a switch on the purple (most years) will kill the signal to the computer. Not bypass the system.

 

that sounds like the idea,if i open the wire at the computer that tell the compressor to turn on,i may save a little fuel,i can get the diagram with no trouble

another quick question-it seems that the engine wants to run at about 3000 rpm with me touching the fuel,the pedal is in the normal position-could this be LIM gasket ?

 

gotcha my bad

 

You're up in NB. Just unplug the wire to the compressor clutch.
I've done it for years (OK,Decades) with no ill effects to the system.

Plug it back in once or twice through the winter to cycle the system for a few minutes and you'll be fine.

Note to others:
In below freezing temps , the air is already dry , using the A/C will not help dry the inside of windshield.
Overuse of the defroster , however, could cause the windshield to crack.