Question about 2003 Jeep Liberty

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Jeep Liberty Defroster does not work when Idle

I have a 2003 Jeep Liberty that has recently been having its share of problems. Yesterday I discovered that when idling (in traffic, at a stop light, just parked) the defrosters stops defrosting the windows. When i began to accelerate (need to get over 10mph) the defroster starts defrosting. I have done some of my own troubleshooting and here are some things i have noted:
1. When the defroster stops working you can smell what seems to be engine coolant.
2. The blower works fine at all speeds and you can feel air blowing out of the vents.
3. The air conditioner works fine (the compressor and clutch were changed within the last month)
4. When sitting in park i have made the vehicle idle as fast as 2500 RPM's and that does not make the defroster work.
5. Once i put the vehicle in drive and exceed 10 mph the windows will suddenly defrost.
Any ideas?

Posted by Anonymous on

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  • Jeep Master
  • 20,706 Answers

It needs service,
i guess front glass defrost fails.
and 2 things must work , AC and the defrost damper
or #3 (overloads the function)
my heater core bad and leaking.(or its 2 hoses)

Posted on Mar 12, 2017

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5 Related Answers

tripletauto

TripleTauto

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SOURCE: Blower not blowing

can you hear the fan working on all speeds?

Posted on Sep 22, 2008

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Anonymous

  • 74 Answers

SOURCE: Blower not blowing

the motor is bad, or there is a fuse blown. check all your fuses, if they are all good then replace the blower motor.

Posted on Sep 22, 2008

Anonymous

  • 2 Answers

SOURCE: heater core leak in 2002 Jeep Grand Cherokee Ltd

your heater core is leaking its not fog on your windows its from the antifreeze having same problem so im replacing it myself but having problems getting the dash off its a head ache the heater core costs 91.99 at autozone i priced the job at a few shops and it runs between 7 and 900 dollars.good luck man

Posted on Feb 08, 2009

gordy

  • 226 Answers

SOURCE: Air stopped blowing through vents, only blows through defroster

Make sure all your vacuum hoses are connected on the engine side. There is a vacuum ball mounted close to or on the fender wall. Make sure that the hose is connected to the vacuum ball. Question: Has the engine started to run rough lately? And do you hear a hissing sound or whistle from the dash area?

Posted on Aug 17, 2009

SQUIRESXX

cock cock

  • 486 Answers

SOURCE: 2001 jeep grand cherokee wont blow air through vents

there is a flap to redirect the air flow under the dash, it may be an item like a pen :) that has dropped down the vent opening stopping it from moving to redirect the air ... failing that, one of the motors/cables that operate the flap has failed

Posted on Dec 05, 2009

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I hope this help you.

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I would start with cleaning the throttle bore and plate. Then clean the Idle Air Control valve, IAC, as this is the device that controls idle speed. Use a can of spray carb cleaner and an old toothbrush. Trouble with the IAC would make sense if you can keep the engine going by holding down the gas pedal a bit.
Use the carb cleaner to check for vacuum leaks at hose connections and elbows. run engine and spray short bursts at hoses and listen for idle speed changes.
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Guru..............saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

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