I guess I'll have to change out the T/stat for another 180* unit. The thing
that drives me nuts is that when I crank it up in the morning and let it
warm up, it will get to and sit in the same place it does once I'm driving.
No matter how long it sits there in the morning(or afternoon before I come
back), it won't go any hotter. That's the way I'd like it, the way it should
be. It almost acts like the enigine gets "heat sink" after I've been
driving. I too drilled the hole in the t-stat when it went in because of the
air issue. I'm pretty sure that the reason it won't get hot on initial
warm-up is because the fan clutch is still locked and the engine fan is
engaged. When it tries to get hot after driving, the engine fan never
engages. I should probably throw a new fan clutch at it too. Does that
'charger help with cooling?? Maybe I should get one of those, too,huh?
Thanks, Bill
Will Coughlin willcoughlin@hotmail.com
'00 Reg. cab 2wd, 4.7L/NV3500HD/9.25" 3.92 sure-grip
----Original Message Follows----
From: SEMIHEMI01@aol.com
Subject: Re: DML: More 4.7L cooling issues
Date: Tue, 11 Dec 2001 06:23:52 EST
Will,
You sound like you have a coolant flow problem for some weird reason.
It sounds like the thermostat is not actually opening up completely. The 4.7
water pump developes a good head pressure and at higher rpms it may be
forcing the t'stat open. I had a RobertShaw that gave me trouble, So I
changed to a Stant. ALSO, I drilled a 1/32" hole in the rim of the
thermostat to guarantee that it would never get an air pocket at the t'stat.
By placing this tiny hole at the top all air can bypass the t'stat. The 4.7
uses a crossflow cooling system and the thermostat uses a bypass system for
a more even warmup period, which just complicates the problem. The flow
direction is also different due to the crossflow system. When I first
replaced mine, I was confused because the t'stat looked like it was in
backwards from the factory. The purpose of the bypass was to give the
aluminum heads an even temp when the thermostat did actually open. I don't
know if all this crap helps you but I do know the 4.7 reacts different from
the other MOPARS. Bill
SEMIHEMI01@AOL.COM> KB SuperChargeded, 4.7L, 2001, QC,
<A HREF="http://hometown.aol.com/semihemi01">the "DAK",</A> <A
HREF="http://futuresite.register.com/jump?url=http%3A%2F%2Fsouthernmopar.org">
SouthernMoPar</A>
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