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Cummins thermostats

dually
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dually

dually

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Do the cummins brand of t stats have a fail safe?The question is when they go bad are they made to brake in the open position? My engine gets hot 190.The t stat housing is hot. The radiator fluid is cold.I am thinking water pump. The radiator and heater core were flushed in summer.

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Mopar1973Man

Mopar1973Man

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Do the cummins brand of t stats have a fail safe?

No... My first OEM orignal failed closed and started to get to hot.

The question is when they go bad are they made to brake in the open position?

Kind of hard when its got a spring pushing the valve closed. Unless the spring fails.

My engine gets hot 190.The t stat housing is hot.

Normal. If your reaching this temp your fine.

The radiator fluid is cold.I am thinking water pump.

Take the truck out for a ride. Return home and carefully open the care with a rag. Remember this is under pressure and could contain hot water. But once you got the cap open look and see if the coolant is moving. Also is the upper hose the same time as the thermostat housing? The lower hose or the cap side will always be considerably cooler.

The radiator and heater core were flushed in summer.

Another suggestion is to replace your thermostat every time you flush the system this just makes sure there is no future problems.
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dually

dually

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Well i put a new t stat in and a water pump.I have heat.To me it could be better.This truck from day one never gets hot to the point you can drive with your coat off,Today it is 20*.It is way better than yesterday with no heat. When i feel the air down at the floor and turn the heat knob to full cold it changes to cold and when i turn it to full heat it gets warm so to me the flapper door is working.Is there a way i can see down there to see if the flapper is moving all the way?? Yes to your last question.Also the heater core hoses are both hot so it is not pluged.

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ISX

ISX

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This truck from day one never gets hot to the point you can drive with your coat off,Today it is 20*.

It was 20F here yesterday too and I usually get 100F over ambient out of the vent next to the radio (so 120F yesterday). That is on just regular, if I put it on recirculate it will get up around 150-160F. I aim to get it so hot that I take my shirt off, figure if it is going to be an arctic day outside it is going to be a desert day inside! :lol:
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ISX

ISX

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I just fixed all that gauge swaying. Put in a new thermostat (this one) and now it is perfect. Before, it would go to 220 then drop to 150 and just keep doing that crap but closing the range, so then it would go to 215 and drop to 160...until it steadied around 190. Now this new thermostat isn't even for the cummins, it's for the 5.9 V8 gasser. I had to rig it a little to make it work. But now it heats up faster and goes to 200 and slowly goes down to 195 and just goes between that 195-200, none of this initial 220 then 150 BS. It works like the damn thing is supposed to! Now I boiled the other one and it was fine so I don't get why it was such a POS. There is something screwy going on with the cummins ones you buy but I can't understand what. So much nicer knowing it goes up to proper temp and holds rather than all the swaying which can't be good for the engine, kinda like dumping a bucket of cold water on a windshield that has been in the desert sun all day. Oh and that one is a superstat, so I am all for them now :hyper:

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