Mechanic? GMC

missed mallards · Postby **missed mallards** » Mon Jul 30, 2007 11:59 am

My brother has a 2000 GMC and the A/C doesn't work.

What all could be involved that i could check to see if it's working or not?

It just quit blowing cold air and has little air pressure.

thanks

sunnylab · Postby **sunnylab** » Mon Jul 30, 2007 12:07 pm

look under the glove compartment and make sure
there is no blockage on the air intake. Usually a plastic
walmart bag is involved in these cases.

Boogerden Boy · Postby **Boogerden Boy** » Mon Jul 30, 2007 12:11 pm

sunnylab wrote:look under the glove compartment and make sure
there is no blockage on the air intake. Usually a plastic
walmart bag is involved in these cases.

Tom,
There is prolly a little filter under the glove box.
My Dad has an '04 GMC, and he has to blow that filter out 2-3 times during the summer because the air flow decreases so much

torch · Postby **torch** » Mon Jul 30, 2007 12:28 pm

check your highside switch. located next to filter drier. lots of times you can shake the wires and it will start working. If it does replace swich about 15.00.

Also that truck has cab airfilters that may be stopped up and killing your airflow.

cwink · Postby **cwink** » Mon Jul 30, 2007 1:11 pm

torch wrote:check your highside switch. located next to filter drier. lots of times you can shake the wires and it will start working. If it does replace swich about 15.00.

Also that truck has cab airfilters that may be stopped up and killing your airflow.

You can also jump that highside switch with a paper clip to see if it starts blowing cold..

RNAIL · Postby **RNAIL** » Tue Jul 31, 2007 11:11 am

Go ahead and replace the cabin air filters if they have never been replaced. I helps the A/C "breathe". Do them at least annually.

bm-tn · Postby **bm-tn** » Tue Jul 31, 2007 11:22 am

Different subject, same issue. Air conditioner leaking in the floor on the passenger side. What causes this?

Bryan

Ducks be us · Postby **Ducks be us** » Tue Jul 31, 2007 11:27 am

Heater cores will leak in the passenger floor board :idea:

Super Black Eagle · Postby **Super Black Eagle** » Tue Jul 31, 2007 11:32 am

bm-tn wrote:Different subject, same issue. Air conditioner leaking in the floor on the passenger side. What causes this?

Bryan

is is water or anti-freeze?

Water = condensation - welcome to Mississippi

Anti-freeze/coolant = leaky heater core - defroster will leave spots on windshield and emit that sweet smell of antifreeze.

torch · Postby **torch** » Tue Jul 31, 2007 12:00 pm

If its water your vent tube is stopped up with dirt, if antifreeze you have a bad heater core

Gumbo · Postby **Gumbo** » Tue Jul 31, 2007 12:19 pm

how do you replace the cabin air filters?
where are they located?

torch · Postby **torch** » Tue Jul 31, 2007 12:41 pm

they are on the passenger side under the dash.

donia · Postby **donia** » Tue Jul 31, 2007 2:20 pm

Gumbo wrote:how do you replace the cabin air filters?
where are they located?

On my '01 Yukon: there is a plastic plate with 3 screws that I have to take off below the glove box, then 1 more screw in the filter cover - long skinny plastic piece with a tab on the motor side and screw closest to you). Pull the first filter out, then there is another one further in (towards the motor) that should almost fall out. Hardest part for me was getting the 3 small screws out with big hands. You can get the filters at NAPA for $15 and the box comes with both filters.

Mechanic? GMC

Mechanic? GMC

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