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Faster Warm Ups?

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I just got off the phone with a friend of mine who is shopping for a Cummins. He looked at one tonight and the owner, supposedly a retired Cummins guy, said he puts a shutoff valve on a coolant line that bypasses the thermostat (1/2 to 3/4" line). In the winter he closes the valve forcing all the coolant to go through the stat, and warming up the coolant faster by not bypassing any. Does anyone know more about this or is someone BSing me here?

I didn't pop the hood yet to check this out, but I would have thought if this were true someone else must be doing it.

Thanks,
Ryan

[This message has been edited by Cooker (edited 01-11-2001). ]
 
Ryan,the heater lines and core are the bypass so the water pump doesn't pump against a closed valve,something that is necessary unless the thermostat has a hole in it(my replacement didn't)A valve in the line will keep it warmer but then you won't have a heater,what's more important,the Cummins' comfort or yours?I think a valve on the heater line is a good idea in the summer though,it seems stupid to bring 180°coolant into the cab when it's hot out.

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95' 25004X4,AT,Driftwood,Banks Stinger,Warn fender flairs and running boards(work truck)
95 3500,5 speed 3:54,Driftwood,Banks&Psycotty,34,000 GCVW apple and tractor hauler(works harder truck)
 
You want your Cummins to heat up quicker? Get an Exhaust Brake! I bought the BD brake for just that reason and it works great. I start the truck, run inside for about 3 minutes, and when I come back the temp gauge is already moving. Within a couple miles I got heat. Before it would never even get start to get warm until 10 miles down the road!
He could even work the Cummins brake into the deal at the dealer.
 
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