Join Date: Mar 2004
Location: Chattanooga, TN
Crew Cab Sonoma is offline
Re: Vent selector not working
yeah , its normal for them to spin some anytime the engine is running.
they never completely disengage.
with the engine off I just check the fan clutch by rotating the fan blades
to see how much drag it has from the clutch. I just go by feel on them.
I don't really have any kind of specific value to give you, but you should
be able to turn it by hand without much force.
if is is very difficult to turn, or doesn't turn at all, it could be defective.
if you arent sure, and know any mechanics, you might want to get their
opinion on how it feels.
as for backpressure, if your truck runs well at heavy throttle or WOT, then your
cat is probably ok.
if it only misfires in wet or damp conditions, then it's likely ignition related.
you might want to open the hood and start up the truck when things are damp,
and look for sparks around the coil or wires. open the throttle up a few times to
see if you see any sparks while the engine is accelerating.
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