Cooling Fans Stays On After Engine Is Off

[rcchevy]

New Issue. Cooling fans stay on after the engine is off, the fan turns off in about 2-4 minutes.
-No Trouble Codes
-The coolant reservoir level is much higher than usual, almost to the top.
-The engine coolant gauge is working since it rises slowly and reaches mid-level (normal temperature) once the engine is warm.

 

[cavell]

Has fans always run this way?
I got a cheap code reader and it shows coolant temp. I noticed temp did rise to 200-215 range and needle did not move on dash. I think dash gauge is set to be more stable to not worry owner. So, your motor may be hotter than you think. High coolant leven in tank is not good

 

[rcchevy]

Problem solved. Replaced the thermostat and the problem is gone.
Put the old thermostat in 195-degree water and it opened slightly, I don't think it's enough to cool the engine properly.
I just don't understand why the engine coolant temperature gauge wasn't reading higher. Thank you for your reply.

 

[SteveK]

you replaced the coolant thermostat and that stopped the electric rad fans? did you install a lower temp thermo?

 

[rcchevy]

you replaced the coolant thermostat and that stopped the electric rad fans? did you install a lower temp thermo?

Set to open thermostat at 195 degrees F. Gates 33329 OE. Purchased at Amazon:https://www.amazon.com/dp/B000C2UEIY?psc=1&ref=ppx_yo2ov_dt_b_product_details
https://www.amazon.com/dp/B000C2UEIY?psc=1&ref=ppx_yo2ov_dt_b_product_details

 

[Severum17]

Engine was probably running hot. Im pretty sure the fans stay on til the engine reaches a certain temp

 

[95-007]

Has fans always run this way?
I got a cheap code reader and it shows coolant temp. I noticed temp did rise to 200-215 range and needle did not move on dash. I think dash gauge is set to be more stable to not worry owner. So, your motor may be hotter than you think. High coolant leven in tank is not good

Already read your post about the new thermostat; and with very hot days (110+) where the engine has just idled for a while before shutdown, it is common for engine health to have the fans run for up to 2 minutes.

 

[rcchevy]

Well, the problem has returned: With the engine off both radiator fans still run for about 2 minutes. One time it ran super high speed, noisily.
The coolant level changes on its own.
The engine coolant temp sensor reads a little below 3 o'clock (mid-level)
Have done the following:
1- Thoroughly bled for air in the cooling system several times, the last time for 1/2 hr. continuously. Made sure that the thermostat was open by reading themps of the in and out hoses we both hot.
2-Replaced thermostat for the second time and ECT ( engine coolant temp sensor) once. These two items are of known good quality and OEM style.
3-There are no coolant leaks.
I assume the ECT controls these fans but obviously, there is something else controlling them. Does anybody know what it is?
Help!
Temperatures presently in Miami, Fl not hot and cooling down.

 

[rcchevy]

I have resolved this problem by purging the air purge valve, continuously, for 26 minutes with the engine running at operating temperature. I have previously purged the air for a shorter time but obviously, that didn't work.
The service manual explains that this coolant reservoir system purges the air from the cooling system but...
Have flushed coolant previously without experiencing this problem