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Posted

Fans (both) keep running after shutting off engine even it this 35 degree weather.   This just started when driving home, notice a new noise and both fans were running.  All had been well and temp gauge was up normal and blowing warm air.   Shut off truck when got in garage and pulled out key and both fans still going, five minutes later they were still going.  

 

Found out if I start truck up, fans will stop running just for a few seconds and if I turn off key in that few seconds they won't come on.  Also noticed that temp gauge was sitting on cold as if not working.  It should be showing heat as it was driven for 30 minutes.  During start up heat gauge did do that thing of going all way up and then back down and stayed there on cold and fans start up.  So I have to start engine up then fans will stop and then quickly turn off truck to get fans to stop.

 

Any ideas, I would guess a heat sensor or something, but don't even know where one is located.   

 

This is a 2014 Silverado Work Truck, with 5.3 engine.  Bench seat, 2 door with 8 foot bed. 

Posted

How many miles on ur truck? Has the thermostat ever been changed? 1st I'd do is see if any of the radiator hoses were warm/hot. Do you have good heat from heater? Any codes?

Ur issue could be a number of things. No silver bullet without some diagnostics to start or you just start firing the parts cannon.

Posted

Thermostat has not been changed, but hoses are warm and blowing lots of hot air.  Overflow is also a little warm.  Water is circulating.   Has 81,652 miles.   There isn't any check engine light, haven't found my code reader, moved a couple months ago everything a mess.   Would think check engine light would be on if any codes, but will try to find reader.  

Posted

Some codes are set without the CEL  being set. 

Posted

With what you've said, it appears your heating/cooling system is working. Next I'd look at your temp sensor.

Posted

I watched they video and seems like what I have going on.  My temp gauge also is staying down and not moving up.  It was up until I starting hearing fans going and shutting off at home.   I don't know if my old 77 year old body can get up there and change that, will have to give a look.  The old lower back just don't like twisting around much. 

 

Thanks for the info.

Posted

I'm an old 77 year old Jarhead and I could do it on my Silverado. Doesn't take much to do. Just relieve the system coolant pressure before removing the Temp sensor but keep keep it sealed & coolant won't go everywhere like in the video.

Posted

Think you are right, I did take off the electrical connection and put back on to see if bad connection.  That didn't help.  During the move we really downsized, from a 24 X 24 work shed on 5 acres to nothing but a garage and small house in a HOA- not my idea.  Got rid of lots of stuff and seems all deep well metric are gone, none of standard sockets seem to fit.   I was thinking same thing, release the pressure before removing sensor.   I may look around some more and find a socket?   My dad was a mechanic for Koss construction and I had a lot of his tool I finely got rid of and I bet all my metric stuff somehow got in with them.  

Posted (edited)

Go to the advance auto or autozone & they'll lone you what you need. Or just take to a service station with a mechanic & he'll change for you.

Edited by rav3
Posted

I should have said, I thought I be smart and leave the sensor unhooked and that would stop the fan thing, that idea didn't work.  Fan still came on with sensor unhooked. 

Posted

I think I've helped as much as I can. Next is up to you. Semper Fi  

Honor Courage Commitment 

SDG

Improvise Adapt Overcome

  • Like 2
Posted
3 hours ago, Diverjer said:

Fans (both) keep running after shutting off engine even it this 35 degree weather.   This just started when driving home, notice a new noise and both fans were running.  All had been well and temp gauge was up normal and blowing warm air.   Shut off truck when got in garage and pulled out key and both fans still going, five minutes later they were still going.  

 

Found out if I start truck up, fans will stop running just for a few seconds and if I turn off key in that few seconds they won't come on.  Also noticed that temp gauge was sitting on cold as if not working.  It should be showing heat as it was driven for 30 minutes.  During start up heat gauge did do that thing of going all way up and then back down and stayed there on cold and fans start up.  So I have to start engine up then fans will stop and then quickly turn off truck to get fans to stop.

 

Any ideas, I would guess a heat sensor or something, but don't even know where one is located.   

 

This is a 2014 Silverado Work Truck, with 5.3 engine.  Bench seat, 2 door with 8 foot bed. 

 

 

 

Its gonna come down to the coolant temp sensor or thermostat.  If you are getting heat, that tells me the thermostat is probably okay.  

 

Being its original and the problem these had 2014-2015 where the thermostat would over cycle and then cause the radiator to leak, if it were my truck I'd replace the thermostat and the sensor and change the coolant out if its original (Dexcool is 5yr or 150k mi, whichever comes first).  

Posted

That sounds like a good suggestion, usually for whatever reason I would wait for 100,000 miles. 

 

Wonder if those fans would ever stop running, if I hadn't found that work around by starting up and quickly shutting off?  I guess they would stop when battery went dead.  That seems like a design problem, if key off electrical devices shouldn't be working. 

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