Coolant Temperature reaching high temperatures and cooling fan on high?

NCFD1323

MEMBER
2013 FORD F-150
5.0L
V8
4WD
AUTOMATIC
90,000 MILES

After reaching operating temperature my coolant temperature keeps going up, the water pump was replaced before the issue began due to water pump failure, since then the thermostat has been replaced, the coolant system has been flushed, new coolant added. However, the system is ranging around 221 degrees on a 190-degree thermostat according to live data thru OBDII from the ECT.

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,787 POSTS

It sounds like you may have a blown head gasket or an obstruction on the inside or outside of the radiator. Here is a guide to help you test the head gasket, you can rent a test kit from an auto parts store for cheap:

https://www.2carpros.com/articles/head-gasket-blown-test

Also, try to look inside and outside the radiator, I have seen mud and hair get stuck on the cooling fins (outer) and corrosion on the inside clogging the cooling tubes.

https://www.2carpros.com/articles/engine-overheating-or-running-hot

Please run down these guides and report back.

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

Monday, August 22nd, 2022 AT 6:11 PM

NCFD1323

MEMBER
2 POSTS

I flushed the radiator and block with fresh water and then filled each area up with coolant and installed a 2nd new thermostat. After getting everything back together I ran the engine topping off the coolant levels to purge the system for air and since haven't had any coolant loss, no sign of coolant in the oil, no smell of coolant from the exhaust would there still be a chance of a blown head gasket. Also, I have heard people with similar issues having to go back to an OEM Ford thermostat the one I have is aftermarket produced by Murray but is still own temperature? When I flushed the radiator and lines it was running clear water no gunk or anything. All these symptoms started after I changed the original water pump and thermostat. Also had someone say a possibility of it being A/C related and had my while A/C system vacuumed and refilled. Before it seemed, the high fans were only kicking on when the A/C was on but that is not the situation now. High fans are kicking on and the temperature is rising to 220-230 range.

Was this

answer

helpful?

Yes

No

Monday, August 22nd, 2022 AT 7:49 PM

KEN L

MASTER CERTIFIED MECHANIC
42,787 POSTS

Yes, I would would say the water pump and thermostat are the problem, I would remove them both and install OEM parts only. You can check Rockauto. Com they have what you need.

Was this

answer

helpful?

Yes

No

Tuesday, August 23rd, 2022 AT 12:08 PM