Question about 2002 Jeep Liberty

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2002 jeep liberty heat only works at high rpm

I have replaced the thermostat and checked the heater core hoses and both are warm. I can feel a difference when the engine is at higher RPM. Low RPM = cool air. RPM at 2000+ = warmer air(not hot).

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  • Contributor
  • 46 Answers

Sounds like low flow issue. Flush and clean system, PROPERLY! Buy a flush kit, drain system, blow compressed air through, fill with cleaner/water mix, run for 30 min with heat on, drain system, blow out with compressed air, fill with water, run for 30 min, drain, blow out with compressed air, fill with 60% coolant mix.

Posted on Nov 26, 2013

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Posted on Jan 02, 2017

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brainyass
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SOURCE: heater only blows warm air.

The hoses from your heater core should be very hot to the touch. Check the hoses going to the core from the water pump. It should be very hot. The return hose should also be very hot. Now check the hoses going to the core. If they are not the same temp, then your heater control valve is not working correctly or the vacuum is not working. At any rate, locate the vacuum line going to the heater valve. Remove the silver bar on the valve from the plastic plunger arm. You will have heat all the time now if it was only a vacuum problem. You can fix it later when it's warmer out. BTW a 200* thermostat will make your heater even hotter.

Posted on Nov 21, 2008

  • 1118 Answers

SOURCE: 96 Jeep Country-Heater blowing warm; NOT hot

unless you got visable signs of leakage its not heater core, but it could be pluged with sediment. take off both heater hoses and flush it both ways until it runs clear. you can also mix a little baking soda and water and pour in core and let set for a while and then flush.

Posted on Jan 17, 2009

  • 159 Answers

SOURCE: When started idels high about 2000 rpm then drops when hot cold ?

the iac probably has carbon built up around it this controls the idle speed try cleaning it first,if not it could be a bad iac or a vaccum leak that the iac takes some time to compensate for to control idle.

Posted on Sep 27, 2009

ramairgto72
  • 75 Answers

SOURCE: My 2000 Grand cherokee only blows warm air from

This is a common problem with WJ Grand Cherokees, it's called a "Blend Door".

In the heating and cooling system you have doors that open and close to give you warm and cold air and a mix of both.

What you have is an arm that pulls a door with peg on top, the peg tends to snap off. As you said your dealer replaced the blend door or doors I would take it back as is has blend door all over it.

Yahoo and youtube "jeep grand cherokee blend door repair"

I had a 02 limited blend doors issues (note the issueS) and was lucky to have it still covered.

I do hope this helped.


ramairgto72_8.gif

Posted on Nov 24, 2010

  • 836 Answers

SOURCE: 1997 jeep wrangler will not

sounds like either the antifreeze solution is to strong [ shouldn't be more then a 70% mixture ] or the heater core is plugged [ some "stop leak" products will cause this.

Posted on Dec 29, 2010

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1 Answer

I only get like warm air on floor but no heat anywhere else. 2001 ford f150


Either your heater blend door is failing, your core is plugged, or you have poor coolant circulation. checking the temp of both heater hoses will rule out the core usually. (Warm engine, heater ON, both hoses should be HOT and near same temperature). If 1 hose is hot and the other cold, your core may be plugged. If both hoses are HOT, and still no heat inside, your heater box is likely not directing the warm air properly on the interior. If neither hose is hot or warm, and heater is ON, your heater control valve should be checked to make sure it is flowing coolant to the heater.

If all THAT seems to pass (heater valve definitely open) an d still low or not heat inside and both hoses the same, your water pump may not be making enough flow to feed the engine and the heater. Typically if this is the problem, holding the engineat high rev (3000+) for 5-10 minutes will cause the heater to warm up mostly, and then dropping the RPM to 1000 or 1500 you will feel it cool off rapidly. If that is the case, you will need cooling system repairs.

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Engine overheating.


That sounds like a plugged heater core or heater hoses. At lower RPM there is not as much pressure from the water pump, so the coolant can't circulate through the heater core. Find the heater hoses (in and out) on the firewall. With the car running, engine warm to hot, squeeze the hoses - they should be hot and pretty tight. If they aren't, then something's probably blocking them. Then you'd just have to figure out if if it's the heater core that's blocked or the hoses. You can disconnect the hoses and blow compressed air in to the heater core. Probably a lot of crud buildup. It's messy but it can be done.

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My heat in my truck comes and goes but the temp gauage stays at normal range


It is possible that the coolant is a little low causing the heater core to get "air locked" Check your coolant level. There could also be a problem with your water pump not able to pump correctly due to a worn or corroded impeller. This will usually cause the heater temperature to fluctuate widely with engine RPM. There is allways some fluctuation caused by RPM, but if it is a large fluctuation, it usually means low water pump output or possibly a partially clogged heater core.
Feel the hoses going into and out of the heater core. They should both be hot. There may be a 20 or 30 degree difference in temperature, but both should feel very hot to the touch. If one is really hot and the other just feels warm, the heater core is probably clogged. If you have access to an infrared thermometer, taking the temperature of the hoses is the best way to check this.
If both hoses feel "Warm" at idle and get really hot when the throttle is cracked open for a short period (20-30 Seconds ), the water pump may be the problem.

Jan 23, 2011 | 2000 GMC Sierra

1 Answer

My heater wont blow hot air.. Just barely warm. I replaced the thermostat but the temp of the heater air has not changed.... Any ideas?


feel the 2 hoses going to the heater core (inlet & outlet) when the engine is warmed up.if there is a noticeable difference in the temp,your heater core is plugged up and will need to be replaced or possibly flushed out. Also check the temp cable to see if it goes all the way to hot

Feb 16, 2010 | 1991 Geo Prizm

3 Answers

My heater takes a long time to warm up


You may need a new thermostat. They are cheap and easy to install on a blazer. They sell different temp ones. ask for a higher temp thermostat if you want warmer heat. Also it would be a good idea to get the cooling system flushed. That helps a lot.

Dec 29, 2009 | 1999 Chevrolet Blazer

1 Answer

Why wont the heater blow hot air, the core doesnt look clogged?


Hi


Thanks for using FixYa. Try and check if the heater core is plugged. Find the 2 coolant lines going to the heater core. They are right next to each other with approx 3/4" hoses going to the engine. Now, warm up the engine with the heater on max (don’t turn on the fan). Next, feel if the hoses are warm (maybe HOT!) If they are not warm, then you most likely have a plugged core. A back flush will resolve the issue. If your hoses are warm, turn on the fan. One hose should go cold (or cooler than the other, actually should be about the same temp as the air from your air vents, if there is a plug). If both hoses are hot and stay hot, and you have no heat, then the problem is not with the heater core but with the blend doors.


There are electric motors that operate the "blend doors" inside the dash directing air flow from the heater core and A/C evaporator core to the cab of the vehicle. If you feel a drastic difference in one of the radiator hoses, then try replacing the thermostat and see what happens. If all the heater and radiator hoses are pretty much the same temperature I would suspect a control problem in the dash controls or in the blend door operation. You’ll need to remove the dash to check these.


Please do accept the solution if the issue is resolved or else revert for further assistance.


Thanks

Rylee

Dec 27, 2009 | 1991 Mazda MPV

1 Answer

2001 crysler town & Country 3.3. when it gets really cold the engine wont warm up. heater doesn't work. replaced thermostat and water pump. still no heat


Hello Justin.
If your thermostat has been replaced with the proper one your engine is heating up.
The problem then becomes twofold.
The amount of coolant/antifreeze flowing through the heater core or a problem with the airflow over the core inside the heater plenum assembly.
I would check for coolant flow through the core first.
If the heat feels like it is warmer coming out an outlet with the fan on a low setting rather than a high one your heater core isn't flowing enough.
To verify you can also check the two hoses that go through the firewall to your heater core once the vehicle has been warmed up, feel the temperature difference between the two. They should both be almost hot enough not to hang on to and close to equal temperature. A hand held temperature gun is really handy for doing this.
If one is hotter than the other your heater core has restricted flow and will need to be flushed or replaced.
Next is to check your temperature blend door operation.
Move the control to hot and cool and listen for the door to move and feel for the temperature to change, if it does at all. The fan on low setting is best to listen and feel temperature changes.
If you feel a temperature change or hear the door thump at each end of it's travel it is OK.
If you have more questions on this problem leave it in "add a comment" and I will return your question.

KL

Dec 12, 2009 | Chrysler Town & Country Cars & Trucks

1 Answer

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faulty thermostat will cause overcooling by staying open at all times.to check this.crank up vechicle until it warm up.becareful watch out for drivebbelt and cooling fan.feel all hoses.plus heater core hoses all hoses should be hot when engine warm up.if engine run until it get hot all hoses feel luke warm thermostat is bad. if all hoses get hot.check your fuses to HVAC mode switch.if all is good.you have a faulty heater air door or it could be stuck.your heater cores could be restricted stopped up.if you have climate control this is a dealership fix.

Dec 12, 2009 | 1999 Jeep Cherokee

1 Answer

Heater takes along time to warm up and gets cold at idle or parked


Sounds like your thermostat is stuck open and not keeping the coolant in the motor long enough to get it good and warm. Try replacing the thermostat first and doing a good flush on the coolant system. Pay close attention to the heater core when you flush the system . Make sure it is on hot while you flush.

If that does not help, (and you can rally check this first) you may have a problem with the flow into the heater core. Feel the two hoses going into the firewall when the engine is hot and see if the hoses are hot going in and out. If you have a laser temp gage you can check the surface temp. One should be a little higher than the other.

Hope this helps.

Nov 22, 2009 | 2002 Buick Century

1 Answer

Heater blows cold air


With the car warmed up,feel the heater hoses,are they both warm/hot near the firewall in the engine compartment?If they are both warm/hot,then the heater core should have circulation through it and it may be a "blend door" issue in the heater a/c assembly.If they are not warm/hot then the heater core could be dirty and plugged up and needs to be flushed.
If the above does not help,a drain and vacuum of the cooling system and vacuum refill will remove any trapped air.
Sometimes,clamping off the top rad hose and holding the engine rpm at 2000 rpm will force trapped air out of the heater core.(Watch temp gauge when trying this)
Lastly,a NEW thermostat doesn't mean its working correctly.

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