1996 K3500 AC problem

External Since: Jul 03, 2005 Posts: 7

I got a problem with my AC.

First off, I only have high and low speeds for my fan. I all ready put
in a new switch and it worked in all the speeds for a couple months and
then right back to only high and low. The guy at the dealers parts
department told me that there is some sort of regulator or something on
my firewall that is the problem here. Although he never heard of this
problem allowing low speed. And definately not working just by
installing a new switch.

What do you think?

My main question here is that when my AC is on high, most of the time
it blows out great. But sometimes, after the truck has been run for a
while, it doesn't really come out at all. The blower is still on high,
you can hear that, but no air coming out, anywhere.
Is there some sort of trick here? Is my truck just f..king with me?

I am planning a trip from Michigan to Texas around Labor Day, for 5
days, and I need that AC blowing great, consistantly cold.

What do you think about this?

-Tim

(Sometimes I wish I never would of bought this truck.)

Joined: May 17, 2005 Posts: 1396

Two possible seperate problems, the first is the is a resistor cluster/bridge in your air duct that give you all the fan speed together with switch, you need to check that. Secong you need to checl for vacum leaks in the actuators and their lines to them that control the air flow in ducts.