Temperature problem

[Micropitt]

Hello all, I have a 2004 Jeep Liberty and just today started seeing a problem with the Temperature. The Temperature will go up when I drive 25 mph or slower. When I drive faster then that, everything is normal.
I would be thankful for any tips, hints or suggestions.

 

[ridenby]

Check electric fan,may not be working. There is a relay below the battery that sometimes goes bad. Some have cleaned fan motor and gotten good results,others have flushed the fins of the radiator and condenser out/off. Start by seeing if fan will run when AC is on,or drive till it shows heat rising see if fan is running.Welcome to site,also.

 

[Micropitt]

Thank you, I will look in to that.

 

[Micropitt]

Ok, I do feel stupid now. I just had my Jeep running for 5 minutes with the AC on and everything was normal. The Fan also changed speed (faster) when I hit the Throttle. I did disconnect the Fan on the connector and then connected it again and I wiggled on the relay.

 

[ridenby]

Check coolant level.

 

[Micropitt]

The Coolant level is normal. Nothing is missing. Maybe it just was a bad cable connection. I will unplug the cable again and maybe use some WD40 on the connector.

 

[ThunderbirdJunkie]

WD40 is not a conductor nor is it a lubricant. Best thing you can do is check the plugs for corrosion.

 

[Micropitt]

WD40 is not a conductor nor is it a lubricant. Best thing you can do is check the plugs for corrosion.

But it does clean well.

 

[Mangate]

I had a problem with corroded contacts on the relay, but it gave me a code and warning light. I know there was a change from the solid state relay to a normal relay at some stage, and maybe the latter does not throw a code. I would not use WD40 either it can cause some plastics and rubber to degrade or disintegrate over time.

 

[LibertyFever]

I had a problem with corroded contacts on the relay, but it gave me a code and warning light. I know there was a change from the solid state relay to a normal relay at some stage, and maybe the latter does not throw a code. I would not use WD40 either it can cause some plastics and rubber to degrade or disintegrate over time.

It's odd isn't it, if you play with or remove the rad's electric fan relay the BCM pops a code but if the fan completely fails (like a blown fuse) there's no code at all. I drove my Libby for two years before I discovered that problem.

Say, maybe your fuses are dirty. And on an 04 Libby the rad relays are found within the under hood fuse block not on an inner fender exposed to the elements.

WD40 may displace water but I wouldn't use it on electrical connectors. Try some brake cleaner instead. Does your electric fan blade move freely? Sometimes they can get really caked with mud.

 

[jnaut]

Thermostat? Coolant may not be flowing correctly or efficiently.

 

[Mangate]

It's odd isn't it, if you play with or remove the rad's electric fan relay the BCM pops a code but if the fan completely fails (like a blown fuse) there's no code at all. I drove my Libby for two years before I discovered that problem.

Say, maybe your fuses are dirty. And on an 04 Libby the rad relays are found within the under hood fuse block not on an inner fender exposed to the elements.

WD40 may displace water but I wouldn't use it on electrical connectors. Try some brake cleaner instead. Does your electric fan blade move freely? Sometimes they can get really caked with mud.

I was wondering how the computer detects a problem with the fan circuit. It obviously doesn't measure the current to the fan if a blown fuse cannot be detected. Maybe it detects current flow to the actuating side of the relay (what would normally be the coil in a standard relay). If this is the case it doesn't help much.

 

[moparman]

Info off the top of my head... Turning on the AC to check the fan only eliminates the fan motor. The AC overrides the temp sensing circuit. You still have a problem.

I just read my Haynes manual on this, not much help, no mention of a relay or temp sensor, just that it uses engine temperature sensing, battery temperature and the PCM to run.