Why does my truck run funny once in a while

Asked by Chevyguy1984 Sep 06, 2015 at 06:29 PM about the 2000 Chevrolet Suburban 2500 LS 4WD

Question type: Maintenance & Repair

I bought a 2000 Chevy suburban 2500 last year. Got full tune up on it battery.
It's
my secondary car so I don't drive it as much. But when I do it makes a weird
rubbing sound like a helicopter is taking off inside the truck. I noticed it when I
got stuck in traffic a few times.  When I brought it to the dealer they said fan
clutch. Got that fixed and a week later same sound. Brought it back, they had
it
for a week and said sorry we can't find anything. I drove it for a few days to
see
if I could make it happen again and nothing happened. Then just the other
day it
happened for a few min.  I have no clue. Any ideas?

1 Answer
223,905

Rowefast answered 9 years ago

I do believe they are right, when in slow moving traffic your motor is heating up. The fan clutch works on temperature to help keep the motor cool, kicking the fan on a 1 to 1 ratio, other wise the fan is just free wheeling to help the motor on drag of the pulley system, witch decreases gas mileage.

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