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Low ECT until pulling up hill

3K views 15 replies 6 participants last post by  dannyboy950 
#1 ·
Ok so I have an 06 f350 and my ECT only runs about 170-175 when driving around town but climbs to 220 fairly fast when loaded. My delta is usually 7-11. I'm planning on replacing the thermostat with a new ford one as soon as I get the chance. My question is will the thermostat help keep it cooler when loaded or will that only solve the running too cold when not pulling issue?
 
#2 ·
There is some contention on this but to me yes it will draw the delta closer together.

The coolant system is designed to be closed and to open at 195*+-. This gives the coolant time to draw absorb heat from the engine [heat exchange] Then to open and exchange the cooler coolant from the radiator to displace the heated coolant from the block then to close and start the cycle again.

With the thermo always open the coolant passes thru the block to fast to absorb the heat from the block properly. In essence a properly operateing system coolant temps will increase but droping block/oil temps by the amount of heat exchanged.

So even tho coolant temp rises oil temp drops bringing the deltas closer. How much depends on the efficiency of the heat exchange.

Hope this helps some. Just my understanding of the heat exchange process of course.
 
#5 ·
Truck will defuel around 254 IIRC (limp mode)
 
#8 ·
Ok guys how did we get from an overly cool coolant temp to a blow head gasket as a possibility. Dumping hot exhaust gases into the coolant is certainly not going to lower coolant temps. Just the opposit.
 
#10 ·
With the engine and transmission both working harder it is generateing more heat with out a corresponding increase in cooling/heat exchange, you begin retaining residual heat eventually. As best I can remember from the course on heat exchange. LOL been a long time since that class tho.
 
#12 ·
That's just how mine acted not saying you have blown gaskets. Around town it would run great until i hit a hill loaded then it would spike quickly. No smoke or any other issues.
 
#13 ·
Really and truely to figure things out better we really need more info, like oil temps did they have a corresponding increase, did the deltas increase etc with the added load.

There are a lot of posts indicateing 200+ degree while towing load on flat ground.
Basicaly we are back to how efficient the heat exchange. The engine as long as it continues to run generates heat, you speed up the btu's increase.

Guess we will have to wait for more info.
 
#14 ·
I've worked my truck pretty good. Got the ECT up to about 215.. The EOT was about 220 at this time also. I felt like it was working properly. The coolant was absorbing the heat the motor produced.


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#16 ·
Ok at those temps yer clutch fan should be just about fully engaged and sounding like a jet engine on take off. Are you getting that.

Either way you need to change the thermostat cause it ain't working right and go from there.
 
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