In my 2005 jeep liberty, the temperature gauge moves to HIGH when idling or below speeds of 30mph while A/C is on, but A/C works fine and stays closer the COLD at higher speeds plus I noticed the cooling fan won't turn on while idling. I replaced the thermastat, but that didn't help.
I would look to the electrical side of the fan operation. You have three basic components to the cooling fan operation...the fan switch, the fan relay, and the fan motor. You need to determine what part of the system is not working. If you can run a 12V jumper wire to the motor and it works you know it must be either the switch or the relay. if you jump out the switch and the fan runs, you know it must be the switch.
SOURCE: no heat when car not moving
Ok, judging from what you've said it sounds like a vacuum issue. The temperature controls are activated by vacuum which is produced by the engine. Look for small hoses that lead from the intake manifold to the firewall, check them and make sure they are not broken, disconnected, or leaking. The vacuum directly controls the doors inside your dashboard which push the air to the heater core. Also make sure that the coolant hoses going to and from the firewall are hot. If all that checks out, then the controls inside the car may have gone bad, or may have become disconnected from the vacuum supply, or the actuator door inside the dash is stuck or broken.
SOURCE: 2002 Jeep Liberty 3.7L cooling problem
There is only so much to the cooling system. Although I
should be careful what I say cause my 02 liberty might over hear me and remind me just how temperamental their cooling system is.
I would replace the thermostat and if that didn't work you may want to remove the top plate holding the radiator down to check for any debris that may have collected on the radiator vanes.
I just replaced mine 3 days ago and the part cost around $20 so it's a pretty cheap item.
As long as your not losing coolant then that's about all you can do. If you are losing coolant regardless what the pressure test shows let me know and I'll help diagnose that problem.
Hope this helps.
SOURCE: When idling my jeep overheats. The cooling fan is
At idling speed an engine does build up a lot of heat and the cooling fan will kick in. In slow moving traffic or traffic jams the temperature gauge can touch the red - particularly on hot days. The reason it cools down when you start moving is because of the air flow through the radiator.
Presumably there are no leaks from the cooling system otherwise you would have mentioned it. In normal circumstances the fan will not be running as you are driving at speed, as the air-flow through the radiator is sufficient to cool things. The fan only kicks in to get rid of excess heat - and this usually occurs at idling speed or after you have parked the car.
If the fan is running all the time as you drive, this points to either a fault in the fan switch, or the car is running too hot. presumably in normal driving the fan isn't running and the temperature gauge reads normal?
It is common - in stationary traffic many cars overheat (particularly big engined models) try to stall and 'cut out'. Restarting can be difficult until the engine cools down.
Is your car overheating in normal driving conditions or just at idle speed? Overheating in normal driving conditions can be caused by things like a failing water pump, blocked radiator, collapsed hose, faulty thermostat or, in the worst case scenario, cylinder head problems.
Overheating at idling speed is 'common'. Check your coolant level. If your car isn't using/losing coolant then there probably is no major problem. You can flush out the cooling system and refill with new coolant - and also check your radiator. Are the cooling fins crumbling with age? Or maybe they're partly clogged with insects and debris from the road? A blast with a hosepipe wil sort that out ..
The question is how much does your car overheat in normal driving? If it doesn't .. it appears as though you have nothing to worry about as such. Most cars have 2 speed fans... the 2nd faster stage kicks in at some point dependant on engine temperature. Perfectly normal.
SOURCE: 04 Jeep Liberty----3.7L---- cooling fans
Try doing a resistance check on the motor itself. You'll have to be patient and slow but hook your meter up to both leads and slowly spin the fan and watch for a dead spot in the fan. I'm working off of an 03 wiring diagram so bare with me if the colors don't match. Here's what I have:
- Dark Blue/Pink should be hot all the time, it comes from Fuse 2 (40amp) in the PDC
- Light Green is the radiator fan relay control (The pcm provides a ground on this circuit which then energizes the relay)
- Yellow- Radiator fan output, should be battery voltage when the relay is energized
- Black/Orange is the ground for the radiator fan as well as the fan relay.
If you have an amp meter that can handle a +/- 40AMP flow then I would also recomend checking the current flow through the fan both while it's running as well as at initial start-up (It takes more current to get it move than it does to keep it moving).
Also, I looked over the 03 and 04 wiring diagrams for the radiator cooling fan and both show the ground for the fan being on a Black/Orange wire at the fan. The power for the 03 is provided on a single wire that is yellow. The 04 year model gets power from the low speed fan relay on a Dark Green wire and the high speed fan relay provides power on a Yellow wire.
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