In a message dated 98-02-16 23:48:38 EST, you write:
<< I have a '95 Dakota SLT CLub Cab 4X4 with a 5.2 L V8 and a 5-speed tranny.
When the truck is cold, the engine noise is quite loud during acceleration.
It sounds like the engine is redlining, even though it's only revving about
1500 RPM and going about 15 km/hr.
This noise only occurs when it's quite cold out (below freezing or a few
degrees
above freezing) and goes away after a few minutes.
I've heard this sound in a few other vehicles as well, notably Chevy V6 Astro
Vans
and Isuzu Rodeos (which also have a Chevy V6 in them). The sound is like a
large
fan running full blast. >>
Ian
This is a common question, but no harm in answering. The noise you here is
the viscous clutch on the cooling fan (assuming you have a V6 or V8). The hub
of the fan is filled with silicone fluid, and it gets pumped through the
housing when the shaft turns without the fan turning. as the truck heats, a
bi-metel strip closes a vavle on the clutch and restricts the pumping action,
causin the shaft to rotate the fan and cool the engine. When this silicone
fluid is cold (or even cool) it is thicker. This makes the clutch fan seem to
work opposite of what is expected. You'll hear the same type of sound when
you sit in traffic and the truck gets hot enough to fully engage the fan
(although in Canada, this may never happen). You describe it as a sounding
like a big fan - that is exactly what it is.
Richard.
=========================================================
Richard Lewis
E-Mail : rlewis7785@AOL.COM
92 Dodge Dakota Club Cab, LE Trim
318 C.I.D V8
3.55 Rear Axle Ratio.
Two Tone Black & Silver
Leer Crown Series Topper Painted to match.
Mopar Bedliner
EdelBrock 1002 Air Cleaner.
Firestone Firehawk SS10 235/70R15
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