Engine is running cold

[bassgas]

Replaced fan with electric fan now engine runs cold around 158. Mechanic installed it had him check it and engine would not heat he replaced thermostat he said rubber gasket had slipped engine got warm enough one time now back to low temp any suggestions

 

[Cbncanada]

Replacing the fan should not make the engine run cold. You either still have a thermostat problem or you are low on coolant or there is a lot of air in the system.

 

[Fless]

Replaced fan with electric fan now engine runs cold around 158. Mechanic installed it had him check it and engine would not heat he replaced thermostat he said rubber gasket had slipped engine got warm enough one time now back to low temp any suggestions

Any other recent work? New radiator?

 

[avalonandl]

You need to burp the system- look it up on google

 

[ks03]

Not too long ago I had temps showing low, running 160ish. Popped a thermostat in, and temps only came up a couple degrees. Pulled out IR temp gun, which might have been good to do in the first place, found my actual temps were about what they should be pointing at the head at the temp sensor, but the sensor was reporting too low. Replaced the temp sensor.

 

[swathdiver]

Replaced fan with electric fan now engine runs cold around 158. Mechanic installed it had him check it and engine would not heat he replaced thermostat he said rubber gasket had slipped engine got warm enough one time now back to low temp any suggestions

What brand of thermostat are they using? OE and one other work and last, the others fail constantly.

 

[Fless]

How about a little more history? How long have you owned the truck?

Has it ever run at the right operating temp, based on the thermostat temp?

Any prior front end damage or other issue that would cause the radiator to have been replaced?

Used a scan tool to see what temp the sensor is reporting?

 

[treehan77]

Do the new fans run all the time? Perhaps the mechanic hooked them up incorrectly, and they just run all the time?

 

[bassgas]

Not too long ago I had temps showing low, running 160ish. Popped a thermostat in, and temps only came up a couple degrees. Pulled out IR temp gun, which might have been good to do in the first place, found my actual temps were about what they should be pointing at the head at the temp sensor, but the sensor was reporting too low. Replaced the temp sensor.

I hooked up my code reader and checked temperature that way. Could temp sensor due that as well?

 

[OR VietVet]

Yea, a temp gun to get actual temp and compare. Likely the temp sender. Doubt the thermostat since it went right back to the colder reading.


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If there is any other info, like upgrades, mods or recent mechanical/maintenance work done, that would be helpful in any post as well. Too many times a question is asked by the poster and after about 10 responses we find out that the poster has done recent work to attempt to fix the problem or work that was done that SEEMS not related to the problem.