I installed that 180 tstat about 2 years ago, and I noticed right from the
beginning it would make the engine run VERY cold if the ambient temp was 70
or below. However, if the ambient temp. got about 90 degrees or more it
would run just as hot, if not hotter than the factory tstat. On a 50 degree
day it will run about 170ish, but on a 95-100 degree day it'd run close to
210. I figured it had to do with the tstat design, didn't know exactly why.
In the winter, mine will run so cold that I'll get a check engine light
because the PCM will get stuck in open loop. Sometimes I'll put a large
piece of cardboard in front of the radiator so that it will warm up to
normal temps during the winter.
Matt Y2K-HEMI
'00 RC 4.7L 5spd
14.23@94.49
<Date: Mon, 7 Oct 2002 17:41:00 -0700
<From: "Saint" <saint1958@cox.net>
<Subject: DML: RE: 4.7L.. What T-Stat to use...... NEW FINDING!!!!!!!
<Interesting Don...I don't anyone with a 4.7 ever experience a problem
<running a 180 thermostat version.
<- ---------------------------------------------
<Steven St.Laurent
<2000 Dodge Dakota Hemi 4.7 (Some idot hit the vehicle)
<2000 Roush Ford Mustang (1 of 2 beta vehicles)
<1999 Chevy Astro (A.K.A. GM Junk) soon to be a cruiser
<1993 Geo Tracker (Amazing vehicle that keeps running)
<PROJECT CAR:
<1992 Suzuki Swift Haybusa GT (fastest stock sub-compact at <200HP/1775lb
<vehicle)
-
----------------------------------------------------------------------------
- ------------------
<Future Purchases:
<2000(?) Dodge Truck (next project vehicle)
<2004 Dodge Ram SRT-10 with a V-10 (replace the Tracker)
<2003 Dodge Hemi Ram Quad (wife vehicle-replace old Astro)
<- -----Original Message-----
<From: owner-dakota-truck@bent.twistedbits.net
<[mailto:owner-dakota-truck@bent.twistedbits.net]On Behalf Of Donald
<Mallett
<Sent: Monday, October 07, 2002 3:14 PM
<To: dakota-truck-moderator@bent.twistedbits.net
<Subject: DML: 4.7L.. What T-Stat to use...... NEW FINDING!!!!!!!
<This is going start to kick up the dirt. Let1s get started.
<To those of us (yea me included) with a aftermarket t-stat....
<I got my FSM last week and was taking a look at the cooling system
<section and noticed a cut away view of the workings of the t-stat in <the
<housing. Noticed the t-stat when in the open position that a plunger <on
the
<back of the t-stat closes a opening. On page 7-7 in the Description <of the
<3Temperature-4.7L Engine2 here is a snip from it....
< 3On a 4.7L engine the t-stat is designed to block the flow of the
<coolant
<bypass journal by 50% instead of completely blocking the flow. This <design
<controls coolant temperature more accurately (Fig 10).2
< I took a look at my OEM 195deg t-stat and up its got a plunger <just
like
<the book says. I stopped by AZ today and compared the back end of <both.
The
<Robert Shaw 755-180 has NO plunger!?! This is the one that1s been in
<Dakota
<for over two years. None of the t-stats in AZ would work in the 4.7L.
<I wonder how temperature control is effective with out this <plunger?
<And now back to our fun........
*---------------------------------Y2KOTA---------------------------------*
Don Mallett
Y2K QC 4.7L Auto SLT+
http://Geocities.com/maldbnsf/
http://www.dakota-truck.net/profiles/dakota/QwkvWz@DAJFf6/profile.htm
*------------- 9-11-01 NEVER AGAIN... MY FREINDS, NEVER
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