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Re: heat only when accelerating
I had a similar problem with my 03 liberty only got hot when I accelerated and gets cold while at stop then hot again as you drive never hot while Idle. Do what I did changed out radiator $120 and fan motor sensor $12.00 located under glovebox. All works fine now. You can have your system pressure checked but why waste $60 at radiator repair facility when the radiator only cost $120 or less new from any major distributor I assuming your fan only works on 1 and 4 as well. This is according to the parts supervisor at JEEP a common related problem for all 02-06 Liberty's so there you have it two birds with one stone.(LOL) Hope this info will help get you out of the cold. Please rate me. And if you need further assistance you can always ask me.
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is coolant circulating in motor/radiator? does radiator top hose get hot when engine has been warmed up? might be water pump, not thermostat. and you do have plenty of antifreeze/coolant in radiator I'm sure.
You could be low on antifreeze, bad water pump, bad thermostat or a collapsed hose. Assuming you do have plenty of antifreeze and hoses are in good shape, do you have good heat inside the car? When car is still warming up open the radiator cap and visually see if antifreeze is circulating. If it's not you can remove the thermostat and then check if you have circulation. If yes then replace the thermostat, if no then replace water pump. That's how I troubleshoot old school cooling systems.
That could be caused by one or more of three things;
1) Bad Thermostat
2) Water pump problems
3) Yes the cooling fans not running properly and not cooling the water could do it.
I would start with the thermostat because that is the number one cause of this problem, remember you can buy a brand new thermostat and it be bad. Then check to see if the water is being pumped thru the motor by the water pump by removing the thermostat and just let the motor run and look in the radiator for circulation. Then watch when the cooling fan comes on and at what temperature because a faulty sensor could be the cause.
Over heating can be caused by a faulty thermostat and or weak water pump and dirty radiator and old antifreeze or the radiator fan now working when at idle but should not over heat when driving. Service the cooling system if it has never been serviced before. Replace the thermostat, buy some radiator flush to clean out the radiator and heater core. Just follow the instruction and replace the antifreeze and make sure it's a 50/50 mix water/antifreeze. If you not sure how to mix it 50/50 you can buy them 50/50 premixed. Water boils at 100'C so you need antifreeze mixed with it but antifreeze does not have the same heat transfer as water so you cannot run 100% antifreeze cause it does not transfer heat fast enough and you over heat. Good luck and hope this helps. Keep me posted, Be glad to help, once you service the cooling system and your still over heating, then we look at the water pump.
One of two things. if it is not leaking either it is the heater core or the thermostat. if it is the thermostat you will most likely have no hot air when you turn on the heat. if it is the heater core you MAY smell antifreeze inside your car when you have the heat on.
Maybe,but I don't believe so.One of two things can be going on,either you don't have a thermostat installed or,your heater core has gone bad.Since you say you have plenty of antifreeze,I would most likely try the themostat.