1999 Jeep Cherokee Engine gets hot while idling.

MARKYZ

MEMBER
1999 JEEP CHEROKEE
6 CYL
AWD
AUTOMATIC
202,000 MILES

So this summer I noticed that my Jeep gets hotter then usual while idling (in traffic). The temperature gauge used to always sit at 100(in the middle 50%) regardless of wether I was driving or idling. Now I see it fill up 75% of the gauge and sometimes more depending on how long I idle. Shortly after I start moving and pick up some speed the temperature gauge drops down to about 50%.

I checked and verified that the clutch fan is spinning.

5 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Try replacing the thermostat for a start

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Wednesday, August 27th, 2008 AT 4:00 PM

MARKYZ

MEMBER
39 POSTS

Thermostat was replaced.
Coolant tested and was good.
Had the cooling system flushed and coolant replaced anyway, issue still occured.

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Wednesday, August 27th, 2008 AT 10:36 PM

BLACKOP555

MECHANIC
10,371 POSTS

You make sure that the fan shroud is in good working condition and securley bolted up to the radiator? If not the suction action of the fan is weakend, has the idle speed went down lately, using under drive pulleys/

try adding a bottle of water wetter. Its a bit expensive but works like a charm.

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Thursday, August 28th, 2008 AT 8:45 PM

MARKYZ

MEMBER
39 POSTS

I didn't notice that there is also a electric cooling fan in front of the clutch fan.

I drove around and heated up the truck, then parked and let it idle to warm up even more, checked the fans, the clucth fan was spinning but the electric fan was off.

I read on some forums that the Fan Relay is known to go causing the fan to not work, however I did not get a check engine light. Any ideas?

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Monday, September 8th, 2008 AT 2:48 PM

RASMATAZ