In a message dated 12/19/2000 10:52:26 AM EST, ron-wong@home.com writes:
<< I would do the t-stat first. When you take the old one out it's pretty
easy
to check. Just put it in a pan of water and heat to boiling. You should
see it open and close when you turn the heat off. Sounds to me like it's
sticking, probably getting ready to fail. While you're poking around the
t-stat area look for any signs of coolant around the pump. Those are signs
of possible pump failure.
Ron
00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
For modifications see my DML Profile
-----Original Message-----
From: owner-dakota-truck@BUFFNET.NET
[mailto:owner-dakota-truck@BUFFNET.NET]On Behalf Of DML
Sent: Tuesday, December 19, 2000 7:23 AM
To: dakota-truck-moderator@twisted.twistedbits.net
Subject: DML: Overheating! - What the problem is?
I've been having an intermittent problem since my tune-up/MSD install with
the truck over heating. The problem has gotten progressively worse until
now it does it virtually every time you drive the truck. The truck comes up
to operating temperature, heat blowing out, then all of a sudden the air
coming out of the vents gets cold and the temp gauge starts going up. It
may go up 10 degrees, it may go up 50 and trigger the check gauges light.
Then all of a sudden something switches, and the temperature falls back to
normal.
Does the heat return out of the vents??
This may sound dumb but, did ya check the rad water level?
Good luck and let us know what ya find.
The thing that really confuses me is that the gauge does these wild
temperature swings really quickly (like 1 min or less from one extreme to
another). My first thought is that the thermostat needs to be replaced, but
I've never seen a vehicle do this. The last time I needed a thermostat it
was because the vehicle never wanted to put out any heat, but it never
overheated. Could it be the water pump? The temp seems most likely to go
back down when RPMs are up a little, not when sitting an idling. Could it
some how relate to the tune up / MSD install? I can't imagine what that
could be, but that's about the time it started. I am planning to change out
the thermostat and replace all the coolant in the next day or two as my
first attempt to fix this, but I'd like a second opinion before I start
changing things. Thanks once again to all who have any suggestions.
Jayson >>
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