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OT duramax

S

schrade

Member
Company I work for has a 2007 Chevy C5500 with a duramax diesel, it will not come up to temp. Put in new thermostats and fan clutch to no avail. What else could it be, thanks.
 
Fan clutch should have no effect, thermostat will block flow.

Does the engine throw a not up to temperature code?

Are you sure the sensor of gauge is accurate?
 
I heard they have two thermostats, that are parallel, and staggered by 5 degrees. One of them is a bypass stat. When it "opens" it closes off bypass flow.
 
Are we talking about just at idle or driving down the road? Do you have the elevated idle feature turned on? Are you just watching/trusting the gauge or using another temp gauge/probe or monitored engine temp on computer data?
 
What is the outside temp? If it is in the single digits,and idling,it won't generate enough heat to register on the gauge. My 07 Dodge with the 6.7 cummins takes 5-10 miles and a couple of hills to read 140. Driving in single digit temps,even with a load,it is rare to see the temp get up to 195 for the thermostat to open.
 
Diesels operate on a different principle than gassers in regards to air and fuel. Gassers operate on a surplus of fuel and air is throttled. Diesels operate on a shortage of fuel and surplus of air so fuel is throttled. This means that the engine is operating mostly as an air pump with unrestricted air flowing through it. this tends to cool the engine at low RPM and no load conditions. Diesels tend not to warm up until you put them to work.
Also, since a diesel will generate a lot of heat when under load, it will have a lot of cooling capacity in the cooling system.
Another thing is that diesels are built heavier to withstand the higher stresses that their necessary high compression and high torque demand. This makes for a lot more mass than a gasser.
Add all of this together, and it explains why a diesel will not warm up quickly (if at all) while idling.
 
Everything maybe OK with the duramax. but could be that outside temp is zero or below. Need to cover grill in front of radiator. Try to keep that cold air off radiator.
 
When the thermostats were replaced did they get all the air purged out of the system? Another "maybe", being a 5500 series it has a larger radiator than a 2500 series would. So that extra cooling capacity could be holding temps down. Might try covering the radiator/grille opening. GM offered a "winter front" cover over the counter. I think my truck even still has one under the rear seat, unused. I have a 2005 3500 series and when it is down around 10 degrees or below, it will stay under 180 unless I load it and work it. (After getting it warmed up for 20-30 minutes)
 
jimg.allentown is correct. Don't worry about it. I have an 04 duramax and it always runs cooler in winter.
 
It appears someone changed radiator with a noncombatable after market that lacks a flow restriction plate. This allowed the coolant to return to the radiator without heating up.
 
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