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  #1  
Old 01-18-2012, 03:55 PM
95ram 95ram is offline
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Default Why wont this thing warm up

Hey guys. I've got a 1998 Dodge Cummins 12V with the P7100 that will not warm up. I've replaced the T-stat with a cummins stat and no change. Ive got the front end completely blocked off with cardboard. The radiator is full. Not sure what else to check. The temp gauge only gets to the first normal line (about 160*) and this is after hours of driving down interstate. I can't even drive it right now because it's so cold. Any thoughts? None of my other 12V's were like this.

Last edited by stodg73; 09-15-2012 at 05:14 PM.
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Old 01-18-2012, 04:10 PM
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stodg73 stodg73 is offline
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Did you make sure that you got all the air out of the engine?


See the small allen plug in the head, take this out and see if you get any air out of the system. After doing this, you may need to refill the radiator with antifreeze.

Have you felt the upper radiator hose after driving for a bit to see if it is hot or even warm?

Others will chime in.
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Old 01-18-2012, 05:06 PM
95ram 95ram is offline
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I think/thought I got all the air out of the system. 12V's dont have that little allen plug like the 24V's do. They have a hose that jumps from one side of the thermostat to the other. This hose should purge all the air out of the system shouldn't it?

And yes, I have felt the upper hose. It is warm but not hot. It also isn't hard like it should be after running for a long period of time.

Last edited by stodg73; 09-15-2012 at 08:55 PM.
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Old 01-18-2012, 07:55 PM
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My truck does not warm up much especially with this colder weather, but the heater puts out hot air. In ten miles of driving to work the temp gauge barely gets up to the normal range (mostly down hill) and it gets about 1/2 the way from the first mark and straight up and down on the way home. You can try a piece of cardboard between the radiator and the inter cooler, but when I did that it really didn't make any difference.
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Old 01-18-2012, 10:15 PM
95ram 95ram is offline
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I get no hot air, I'd say barely warm.
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Old 01-19-2012, 12:47 AM
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Where did you block the front up at? you need to block the front of the radiator and leave a 6 inch hole in the area of the fan clutch. If you blocked off the grill that does no good.
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Old 01-19-2012, 09:33 AM
95ram 95ram is offline
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It's blocked off between the radiator and intercooler with a small hole for the fan clutch. This is where I've always put it and it has always helped me.
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Old 01-19-2012, 09:44 AM
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I've got no problem getting to 195*F worth of coolant even in minus weather... The temp out of dash might be a bit cooler and require the blend door to be fully max HOT. But I still get enough heat to get the cab to +80*F with -20*F weather. I typically just block the grill and works fine I can even tow this way too without overheating... But with the cardboard in-vbetween be very careful because you can over heat because of the cold air blowing on the fan clutch constantly will keep it unloacked and the radiator face it blcoked so even if the fan could lock it could never cool down.

Just be careful...
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Old 01-19-2012, 08:04 PM
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That sounds more like a blend door problem than an engine temp problem. Another possible problem is the heater core may need to be flushed. Do the heater hoses feel warm at all?
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Old 01-22-2012, 10:02 PM
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Heater core might be plugged.
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