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Author Topic: Cabin Air Filters??  (Read 3312 times)

kenkaman

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Cabin Air Filters??
« on: October 18, 2012, 11:45:01 PM »
1998 C3500 Crew-Cab Dually w/7.4 Liter Eng...Does this truck have Cabin Air Filters and if so, is it behind or under the glove box like most other trucks?  Tks.

someotherguy

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Re: Cabin Air Filters??
« Reply #1 on: October 19, 2012, 09:51:03 AM »
No cabin air filters on any year of the 88-98 (GMT400) body style truck.

If you're experiencing poor airflow despite a properly working blower motor, or stinky/moldy air, it's gonna be due to the evaporator core being clogged with crap.  Debris, leaves, and literally mud as the dust/dirt in there combined with the fact that the core will be wet during use, sets up an ugly situation:



Richard
06 Silverado ISS / 06 Silverado SS / 06 300C SRT8

kenkaman

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Re: Cabin Air Filters??
« Reply #2 on: October 19, 2012, 10:20:20 AM »
Thanks Rich...Now, where exactly do I find that on the truck?  Is it in the big black box tucked away under the glove compartment?  I opened that up last week and saw something that looked like that...the guys were telling me it was some kind of heater core???

someotherguy

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Re: Cabin Air Filters??
« Reply #3 on: October 19, 2012, 09:44:51 PM »
When you remove that lower cover you are looking at the heater core.  The evaporator core stands straight up in the box, to the left of the blower motor.  If you remove the blower motor and reach through the housing to the left (the direction it blows), you'll probably be able to feel some of the leaves and other debris.  What some people do after vacuuming/picking out the debris is remove the heater core, turn the temperature control until the flap raises up and out of the way, then from the blower motor side spray some cleaner on the evaporator core - let it soak in - then flush with a water hose through the flap above the heater core, back towards the blower motor.  This way you knock the mud and crap off the fins of the core without attempting to push it through the fins.  You'll want to put garbage bags or something on the floor to route any excess water out, and you'll probably have to stop several times to clear the evaporator drain line out with a stiff wire.  Its outlet is in the engine compartment immediately near where the two heater core hoses go through.  Be sure to use a cleaner intended for evaporator cores, there's a foamy version out there...you don't want to use anything acidic that will corrode the aluminum.

Richard
06 Silverado ISS / 06 Silverado SS / 06 300C SRT8

ED-NY

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Re: Cabin Air Filters??
« Reply #4 on: October 19, 2012, 10:42:25 PM »
I remember seeing an article mentioning spraying the A/C vents inside the dash with spray antiseptic and laying a shop rag over them so the antiseptic can work. Just be sure the antiseptic is rated to kill fungi (mold)?

 


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