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24 Valve 2nd Gen Dodge Cummins 98.5-02 Discussion of 24 Valve 5.9 Liter Dodge Cummins Diesels with VP44 Injection Pumps

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  #1  
Old 01-11-2014, 10:01 AM
Diesel Fan

   

Default My temp gauge goes to 190 then back down to 150ish

While driving my temp gauge goes up and down.and heat never gets hot just warm.new thermostat
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  #2  
Old 01-11-2014, 01:38 PM
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pclem11
   

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Mine died the same thing, only difference is my heat blows hot as hell
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  #3  
Old 01-11-2014, 02:00 PM
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Status: I got the black lung, pop. *cough*

   

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You've got a bad thermostat or a whole lot of air in your cooling system.

the.beard's Sig:'91.5 Dodge W250 auto. Stock.
'95 Dodge Ram 3500 4x4 5-speed Dually. Not even close to stock.
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  #4  
Old 01-14-2014, 09:18 PM
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Betcha money a cummins thermostat will fix it. We see a lot of folks installing stants and come to us with this problem.

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  #5  
Old 01-15-2014, 12:52 PM
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pclem11
   

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Originally Posted by mysterync View Post
Betcha money a cummins thermostat will fix it. We see a lot of folks installing stants and come to us with this problem.

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what about having this issue before the tstat was replaced like on my truck?
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Old 01-15-2014, 01:26 PM
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Could be a number of things. Anytime you have wide fluctuations that are persistent we would look for as mentioned above air in the cooling system, air entering the system via a leak (pretty rare with these trucks) or possibly a faulty gauge. In theory a water pump can cause it but unless the fins are missing a faulty pump is pretty hard not to notice. In very cold climates a big cooling system will experience variations.
I would start with a coolant funnel and verify there's no air in it and move from there. Obviously a faulty thermostat could cause similar issues as well.

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Last edited by mysterync; 01-15-2014 at 01:37 PM..
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  #7  
Old 01-15-2014, 11:11 PM
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pclem11
   

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So I've replaced my thermo,added an aftermarket gauge, and water pump seems fine. I will give the funnel trick a shot.
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  #8  
Old 01-16-2014, 06:35 AM
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Originally Posted by Pclem View Post
So I've replaced my thermo,added an aftermarket gauge, and water pump seems fine. I will give the funnel trick a shot.

Did you use a cummins thermostat?

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  #9  
Old 01-16-2014, 09:41 AM
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pclem11
   

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no, i used a failsafe from autozone, that way if it does fail it will fail open
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  #10  
Old 01-16-2014, 10:40 AM
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Originally Posted by Pclem View Post
no, i used a failsafe from autozone, that way if it does fail it will fail open
We sure do replace a bunch of the fail safe thermostats in otherwise normally functioning cooling systems. Might be wise to do some research on those thermostats and you might find that they cause more trouble than their worth!
Did the thermostat you installed have the "jiggle" valves? They say they have a "bleed notch" but they just don't work well. Often cause drastic temperature swings. If I were in your shoes I'd order a cummins thermostat and see if that fixed my problem.

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