Overheating after replacing the radiator and thermostat

BUTCHRENO

MEMBER
2004 JEEP GRAND CHEROKEE
6 CYL
2WD
AUTOMATIC
90,000 MILES

After replacing the radiator and thermostat, I let the car idle
for 20 minutes temperature went to about 220 electric fan came on for only
about one minute and shut off. From this point temperature continue
to climb until warning light came on. Fan never did come back on?

5 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good morning,

How did you bleed the system of air?

What I do is leave the cap off, have someone inside revving the engine until 1,200 RPM's and you under the hood and add coolant as needed. When the thermostat opens, it will burp the air and you add the coolant. Have the person inside the truck turn on the heater. When they have good heat, there is no more air.

Try this. It may be just air in the system from the repair.

Roy

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Friday, September 4th, 2020 AT 7:46 AM

BUTCHRENO

MEMBER
6 POSTS

I did as you recommended but no luck. Is it possible to have a bad fan control and it come on for such a short period of time? Should the fan stay on until the temperature goes down to normal?

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Friday, September 4th, 2020 AT 11:21 AM

ASEMASTER6371

MECHANIC
52,797 POSTS

Did you have this issue prior to the repairs?

https://www.2carpros.com/articles/how-an-electric-cooling-fan-works

Why did you perform these repairs?

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

I am concerned for a possible head gasket issue if it overheated.

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

Roy

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Friday, September 4th, 2020 AT 11:48 AM

BUTCHRENO

MEMBER
6 POSTS

The radiator was cracked. So I replaced it after about a week car overheated again so I replaced thermostat. I don’t understand why the elect fan shut down after only running a few minutes when the car continued to over heat.
I don’t think head gasket it was shut down immediately.

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Sunday, September 6th, 2020 AT 12:01 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

If there is air in the system from a leaking head gasket, the fan will not work long as it needs to be in coolant to send the proper signal to the relay for turning on the fan.

I attached the wire diagram for you to view. Check the fuses for power with the key on to be sure power is sent to the relays.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-check-a-car-fuse

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Roy

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