Question about 2002 Jeep Liberty

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2002 jeep liberty 3.7, heater blows only warm air. Changed themostat,flushed heater core...flows clean both ways, flushed radiator clean. All hoses to and from heater core are nice and hot about the same as all the rad. Hoses. It never overheated just low heat also checked the old themostat in a pot of water and that turned out to be good...opened right at 192

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  • maloneycr Oct 31, 2013

    Did you ever solve the problem? I have the same thing going on.



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  • Jeep Master
  • 14,406 Answers

Could be your blend door is not opening all the way on heat,here's a link to look at.

Posted on Jan 20, 2013

  • 2 more comments 
  • Robert Fedorczyk Jan 21, 2013

    Thanks, link talks about two different installations, were there two HVAC units for 2002 jeep liberty?

  • Thomas Perkins
    Thomas Perkins Jan 21, 2013

    Yeah,one is for Liberty,other is for Wrangler,sorry for the confusion.

  • Robert Fedorczyk Jan 22, 2013

    Thanks Tom, it's my daughters jeep and its not here right now. I'll check it out in a day or two and let you know how I made out....definitely sounds like you got me on the right path, thanks, Bob

  • Robert Fedorczyk Jan 22, 2013

    Tom I can't find the yes button under your solution , but YES it did help thanks



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Posted on Jan 02, 2017

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hi, I had the same problem. change the fan relay and the wire molex to the relay. The wire molex is the most important part, because the the wire wears out from the heat. good luck

Posted on Nov 21, 2012

  • 702 Answers

SOURCE: 94 jeep wrangler overheating

Have the cooling system pressure tested. If it holds pressure, that's a good thing. If it doesn't hold pressure, you may have a leaking head gasket. What may be happening is the crack in the head gasket could be blowing hot air into the cooling system causing it to overheat.

Posted on Sep 27, 2008

  • 242 Answers

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

  • 404 Answers

SOURCE: The heat in my 1992 Jeep Wangler is not working.

It appears we have an Air lock scenario and you will need to perform a system Bleed.
Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.
If persistent boil ups/over attention must made in the cylinder head
or gasket area, or possibly water pump?
Please press the Blue button to appraise my FREE Efforts, Thank You!
Paul 'W' U.K.

Posted on Feb 05, 2009

  • 2299 Answers

SOURCE: I have a 4cyl 1998

There is a heater control valve on the heater core hose. This is a common problem on the Jeep Wranglers. The valve is not opening.

Posted on Jan 10, 2011

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4 Answers

My 2002 Jeep Liberty 3.7 don't throw me heat only cold air

There is something called a blend door in the heater box. This door is what moves to change from cold air to warm air. The part is 86 dollars online.

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I have a jeep liberty 2002 changed radiator heater core back flushed at jeep dealer heater works for a while really hot and sometime itj just starts blowing cold air suggestion jeep dealer said sceen keep...

What does your radiator fill tank look like? When is the last time you changed radiator fluid? If you have an oil leak into the radiator, combination produces a jelly like substance that may be what blocks the screen. You may need a radiator flush and refill.

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Make sure that the intake is not leaking, pressurise the system and look for a leak.

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2005 jeep liberty blows cold air through the heater.

Either you are low on coolant and there is air in your heater core, or the thermostat isn't working properly, or your water pump is going out.

Dec 13, 2014 | 2005 Jeep Liberty

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2002 jeep liberty

there is a blend door actuator under the dash that controls air flow.
This would need to be changed

Dec 10, 2013 | Mercury Cougar Cars & Trucks

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2002 jeep liberty heat only works at high rpm

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.

Nov 26, 2013 | 2002 Jeep Liberty

1 Answer

Heater on 03 jeep liberty blows hot air only when motor is revved and cold air at traffic lights

oneor two things low coolant in radiator or poor flow through heater core . if motor is at normal running temp. and coolant full , then heater core needs flushed, check coolant in radiator first....

Dec 05, 2011 | 2003 Jeep Liberty

1 Answer

I have a 4cyl 1999 Jeep Wrangler. The heater only blows warm air, no hot air. I have back flushed the heater core with a garden hose and there was no clog. I have checked the t-stat and it is...

The key is the heater hoses. The top hose is the inlet for the heater core and the bottom is the return line. If the bottom hose is not hot, there is little flow through the heater core. It does not have to be completely clogged to reduce the heat output. The core needs to be flushed multiple times IN BOTH DIRECTIONS through the heater hoses. If this does not restore the heat, try a commercial/radiator flush. Many people have had alot of success by filling the core, through the heater hoses, with a CLR type product and letting it sit for 10-15 minutes to remove scale followed by a thorough flush.

Jan 08, 2011 | 1999 Jeep Wrangler

1 Answer

Why does my 02 Jeep Liberty blow out cold air at an idle & warm air only while driving?

Hello mcebbie.
From the symptoms you describe it is a restriction in the heater core or the hoses.
At idle the water pump is turning slowly and has less pressure and flow.
As your engine speeds up so does the water pump and it flows more heated coolant through the core.
Check for a pinched line in and out of the heater core. If they appear OK you may need the core flushed or replaced.
I hope your repair goes well for you.

Thank you for using FixYa.

Oct 15, 2010 | Jeep Liberty Cars & Trucks

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