Question about 2001 Jeep Grand Cherokee

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Heater wont work its as if the heater core is not getting fluid

The heater will not get hot on the interior. It is full of radiator fluid. and the ac works fine.

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  • ptmidkiff Oct 08, 2009

    thanks for all the ideas I will check those out this
    weekend.

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Sounds like the water line going to the heater core inside is blocked or it may be moved if you have a bad heater core i also have a grand cherokee 2001

Posted on Oct 08, 2009

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Sounds to me like the thermostat is stuck open on the vehicle. Replacing that should solve your problem.

Posted on Oct 08, 2009

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1 Answer

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check radiator fluid is full the heater operates buy the radiator fluid flowing through the heater core. next your thermostat might be stuck in the open position thus your radiator fluid not heating up on cold days - no hot radiator fluid no heat. if fan is not coming on check fuse first if fuse is good check heater fan motor

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I would suggest that you have a small leak in your heater core. It does not take much of a leak to cause moisture on the windows. Eventually your radiator fluid will start to go down. This will not get any better and you need to replace the heater core. You may soon smell a sweet antifreeze smell as well and if you drive that way your interior will get sticky. Get it checked ASAP

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If it is filled up to capacity (also check that the upper radiator hose is full of fluid by squeezing), then the next thing to check is the two heater hoses that enter the firewall for the heater core. If they aren't getting hot at normal operating temperature, the heater core is plugged up and will have to be flushed or replaced.

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Heater does not come on, Radiator fluid full. Fluid heats, heater does not work blower works heater does not get hot or even warm.


Probably air locked. check to see if one of the hoses leading into heater is hot. Other cause could be heater solenoid control valve faulty. Very unlikely that the heater matrix is blocked. Easiest way to bleed heater is to remove hose's when car is cold and GENTLY flush through with garden hose and push hoses back on when full of water, so you know you have a heater full of fluid. Hope this helps

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Did they change the Thermostat? Did they flush the system? Check where the heater core hose meet the firewall. Is one hot and the other cold? They both should be hot when the engine is at full temperatur. If one is hot? And the other is cold? You have a blocked Heater core. Now the radiator hoses that meet the radiator. If one is hot and the other is cold? You have a bad thermostat. Try bledding the system if all above fails.

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Heater in my 2002 jeep wont get hot unless going down the road and I have water in the floor on the pasenger side.


Sounds like you have a leak at the heater core and lack of heat usually means low water level in radiator. When engine is cold ,add some radiator "stop leak" top up the radiator, start the jeep but leave the cap off until the water is hot and you are sure radiator is full. Then tighten cap and drive or idle for about half hour or more. When you can afford it change out the heater core.

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The temp guage pegs out on my 2005 uplander. I have changed the thermostat and flushed the radiator. The water pump seems fine and both radiator hoses get hot after it runs for a while. The fans kick on...


Having a blocked heater core will not make the engine over heat. You will just not get any of the heat from the fluid that would normally be pushed through the heater core because your core or cores are blocked (I think you have two cores if you have a rear heater.). The engine does not need your interior heater cores to keep cool. When you select "heat" on your console, either a valve opens up and allows fluid to move through the lines to your heater cores and or an air duct opens to the cores to blow air across them...


Did your heater work before your work?

Does the gauge stay pegged or does it fluctuate?


If your gauge now fluctuates after your work, it would indicate to me that there is air trapped in the engine or bubbles passing by. The air does not cool the engine block as well so the temp will rise quickly. It will then cool a bit as the coolant splashes by. If your gauge is staying hot and never moves, it could mean: you are missing a lot of coolant, trapped air near the temp sender, or your thermostat is not opening. A closed thermostat would make the gauge go all the way hot and stay hot. The thermostat can be checked with a pan of boiling water on the stove. When boiling, put the thermostat in the water and check to see if it opens. It is also important that the thermostat is installed in the correct direction. The temp sensor much be on the engine side. I am also assuming your pump shaft is not sheared and is still connected to the impeller and it is spinning as well. You can take your belt off and move it by hand to see if you feel any resistance. If you are sure the thermostat is opening and the pump circulating, I would then check and see if you have air in trapped in your system. I looked at my Uplander and noted a lot of hoses and metal pipes at a higher level than the filler neck of the radiator. Perhaps, when you filled your system back up from the radiator, that a lot of air got trapped in the upper part of the engine and the heater lines. I also saw that there were little brass valves near were the hoses connect near the pump and on the driver side. I would suggest running the engine and open and close the little brass check valve on the divers side to see if you have fluid or just air coming out. I wouldn

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Sounds like the thermostat is stuck open or fans running all the time (if electric). If water pump was shot, then engine would get hot, depending on the temperature where you are.
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Hello,
The thermostat was a good choice however you should go to a service station and get a complete cooling system flush.
your heater core and or radiator could be clogged.

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