Need to re-set and get info on my GMC A/C problem:

1866 Views 18 Replies 8 Participants Last post by IMPATIENT 1, Jul 16, 2009

TPC

Discussion Starter · Jul 15, 2009

Someone on HB's posted the GM bulletin on this GM truck AC problem:

After a few hours, the A/C blows less air, and warmer air.
Parking the truck for about 30 minutes, the a/c will work again for a few hours, then the problem repeats itself.

The bulletin was a 3 pager with several items in the system that had to be upgraded to correct it.

My freon pressure and switches are fine,, the AC works great for 2 hours then the low, warm air flow mulligan shows it's ugly head again.

If anyone has the bulletin number or the bulletin would sure appreciate the info.
This problem has finally jumped us.

Our GM dealers here can't seem to find it the info.

Thanks

1 - 19 of 19 Posts

dicudmore

· #2 · Jul 15, 2009

TPC said:
Someone on HB's posted the GM bulletin on this GM truck AC problem:

After a few hours, the A/C blows less air, and warmer air.
Parking the truck for about 30 minutes, the a/c will work again for a few hours, then the problem repeats itself.

The bulletin was a 3 pager with several items in the system that had to be upgraded to correct it.

My freon pressure and switches are fine,, the AC works great for 2 hours then the low, warm air flow mulligan shows it's ugly head again.

If anyone has the bulletin number or the bulletin would sure appreciate the info.
This problem has finally jumped us.

Our GM dealers here can't seem to find it the info.

Thanks

system is freezing...pressure cycling switch on the accumulator

IMPATIENT 1

· #3 · Jul 15, 2009

dicudmore said:
system is freezing...pressure cycling switch on the accumulator

that or his cabin air filters are clogged and its causing the evap to freeze over

bulb what model is it or did i skim to fast over the details

low freon level will do it as well.

Fullup

· #4 · Jul 15, 2009

My 03 suburban had this problem. Had to change out an engine overtemp sensor. Nothing shows on the gauge package so you never see it. Just one more thing for you to consider. The mechanics Cali couldn't diagnose the problem. GM A/C mechanic in Vegas hit it first time.

IMPATIENT 1

· #5 · Jul 15, 2009

Fullup said:
My 03 suburban had this problem. Had to change out an engine overtemp sensor. Nothing shows on the gauge package so you never see it. Just one more thing for you to consider. The mechanics Cali couldn't diagnose the problem. GM A/C mechanic in Vegas hit it first time.

cali techs most not be that great from what i've gathered reading yalls issues with em

i work in a small dealership in a small town, you phuck up and you lose not only that customer, but the 5others he told about the experience

bulb nothing leaves our dept unless its right, our service manager even drives every car leaving to make sure its fixed, or the noise that customer herd was gone.

Mandelon

· #6 · Jul 15, 2009

My 04 burb does that sometimes. The ac quits being cold and blows hot air. Turn the car off and wait about 30 seconds, then it works fine for for weeks.

Also had the drivers seat controls quit working. That was murder on my knees....it was set for my wife.....and both seat heaters quit. About 3 weeks later it works again....

IMPATIENT 1

· #7 · Jul 15, 2009

Mandelon said:
My 04 burb does that sometimes. The ac quits being cold and blows hot air. Turn the car off and wait about 30 seconds, then it works fine for for weeks.

Also had the drivers seat controls quit working. That was murder on my knees....it was set for my wife.....and both seat heaters quit. About 3 weeks later it works again....

does it still blow out 1 side cold and the other hot or hot outta both sides?

look under the seat and make sure there's not a harness get shorted as the seat track goes over it, lotta people will shove a umbrella or flashlite under the seat and make the harness come lose, then chit begins to happen wrong.

redman

· #8 · Jul 15, 2009

TPC said:
Someone on HB's posted the GM bulletin on this GM truck AC problem:

After a few hours, the A/C blows less air, and warmer air.
Parking the truck for about 30 minutes, the a/c will work again for a few hours, then the problem repeats itself.

The bulletin was a 3 pager with several items in the system that had to be upgraded to correct it.

My freon pressure and switches are fine,, the AC works great for 2 hours then the low, warm air flow mulligan shows it's ugly head again.

If anyone has the bulletin number or the bulletin would sure appreciate the info.
This problem has finally jumped us.

Our GM dealers here can't seem to find it the info.

Thanks

Whats the exact year/make model,makes bulletin searching much easier

Mandelon

· #9 · Jul 15, 2009

IMPATIENT 1 said:
does it still blow out 1 side cold and the other hot or hot outta both sides?

look under the seat and make sure there's not a harness get shorted as the seat track goes over it, lotta people will shove a umbrella or flashlite under the seat and make the harness come lose, then chit begins to happen wrong.

Hotter on the drivers side. Like really hot!

IMPATIENT 1

· #10 · Jul 15, 2009

Mandelon said:
Hotter on the drivers side. Like really hot!

there's a mode actuator at the bottom of the hvac case that's not working or getting a bad connection. pop off that lil acces panel on the far rh side of the dash, almost looks like a fuse cover that's on the lh far side. unplug and replug all those connectors goin into the junction block and see if it stops doin it , if it does there's a couple terminals lose in 1 of those connectors(i see that alot!), if it still doesn't work after jacking with the connectors i mentioned, replace the lh air temp actuator, its easy to do, only requires a flashlite to see, a 7mm socket, 7/32 socket to get the actuator attachment bolts out.

when the freon level is low on your's, 1 side will get slightly colder than the other, but both sides will still be cold, so i don't think the a/c system itself is at fault, prob the actuator.

plaster dave

· #11 · Jul 16, 2009

IMPATIENT 1 said:
there's a mode actuator at the bottom of the hvac case that's not working or getting a bad connection. pop off that lil acces panel on the far rh side of the dash, almost looks like a fuse cover that's on the lh far side. unplug and replug all those connectors goin into the junction block and see if it stops doin it , if it does there's a couple terminals lose in 1 of those connectors(i see that alot!), if it still doesn't work after jacking with the connectors i mentioned, replace the lh air temp actuator, its easy to do, only requires a flashlite to see, a 7mm socket, 7/32 socket to get the actuator attachment bolts out.

when the freon level is low on your's, 1 side will get slightly colder than the other, but both sides will still be cold, so i don't think the a/c system itself is at fault, prob the actuator.

Thx mine just started doing this the other day.

IMPATIENT 1

· #12 · Jul 16, 2009

plaster dave said:
Thx mine just started doing this the other day.

pm me if you guys need the gm service manual instructions, i can post em tommorrow from work if yall need em

Mandelon

· #13 · Jul 16, 2009

IMPATIENT 1 said:
there's a mode actuator at the bottom of the hvac case that's not working or getting a bad connection. pop off that lil acces panel on the far rh side of the dash, almost looks like a fuse cover that's on the lh far side. unplug and replug all those connectors goin into the junction block and see if it stops doin it , if it does there's a couple terminals lose in 1 of those connectors(i see that alot!), if it still doesn't work after jacking with the connectors i mentioned, replace the lh air temp actuator, its easy to do, only requires a flashlite to see, a 7mm socket, 7/32 socket to get the actuator attachment bolts out.

when the freon level is low on your's, 1 side will get slightly colder than the other, but both sides will still be cold, so i don't think the a/c system itself is at fault, prob the actuator.

Thanks! I'll give that try.

phebus

· #14 · Jul 16, 2009

Mandelon said:
Hotter on the drivers side. Like really hot!

Have your wife drive and sit on the cool side.

IMPATIENT 1

· #15 · Jul 16, 2009

phebus said:
Have your wife drive and sit on the cool side.

with no bra in a wife beater shirt

devil

phebus

· #16 · Jul 16, 2009

phebus said:
Have your wife drive and sit on the cool side.

IMPATIENT 1 said:
with no bra in a wife beater shirtdevil

And wherever you're going, pick me up on the way.

Mandelon

· #17 · Jul 16, 2009

Sheer Genius!! That's why you're retired and I'm not!

TPC

Discussion Starter · #18 · Jul 16, 2009

Thanks for the tips.
2001 GMC HD 8.1.

IMPATIENT 1

· #19 · Jul 16, 2009

TPC said:
Thanks for the tips.
2001 GMC HD 8.1.

is your a/c controller on the dash auto or manual? got knobs or buttons.

1 - 19 of 19 Posts

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