Question about 2001 Jeep Grand Cherokee

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2001 Jeep Grand Cherokee heater does not work. Saw the Youtube videos, cut hole in box, verified blend doors both operate when heat turned up. Flushed radiator with a commercial radiator treatment (Prestone), then flushed heater core seperately. THREE times. Nothing really came out, seems to be adequate flow going thru with garden hose hooked to hot water faucet off washing machine. STILL only cold air. Does the sensor mounted on side of thermostat housing have anything do with heater?

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  • Dan Murrell
    Dan Murrell Jan 16, 2014

    I HAVE replaced thermostat AND water pump.

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  • Jeep Master
  • 5,962 Answers

Probly need a new heater core--get a haynes manual or library sec629 has pro mechanics series--if u get new one test evaporator and blower motor also to save labor

Posted on Jan 16, 2014

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6ya6ya

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  • 2 Answers

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Posted on Jan 02, 2017

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Mark Egan

  • 1214 Answers

SOURCE: have heat sometimes. replace radiator,thermasta

Make sure the fan control module has not failed. They tend to do this on Chrysler products. Mine did on my '03 Jeep GC at about 48k miles..

Posted on Dec 18, 2009

Anonymous

  • 1985 Answers

SOURCE: 1996 jeep grand cherokee blower works but no heat

Since your blower is working and it is a heat issue,thats where we'll start,First thing is have you checked the coolant level in the radiator when engine is cold,make sure it is filled to top,next verify you have coolant in reserve ,Start your van and get it up to normal operation temperature,If your heat gauge on the dash works correctly it should be 190 degrees,Now lift the hood and locate the two heater hoses going into the heater assembly at the fire wall,Both hoses should be hot to hold on to,if both are hot and no heat inside your problem will be the blend air door in heater assembly.
if neither hose is that hot you need to replace the thermostat in the engine to get it up to 195 degrees.
if one hose is hot and one is luke warm then the heater core is blocked and to blame. hope this helps you.

Posted on Jan 12, 2010

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Colin Stickland

  • 22484 Answers

SOURCE: I HAVE A 2002 GRAND CHEROKEE LINITED WITH THE V8, I HAVE TOOK THE HEATER HOSES OFF THE ENGINE AND FLUSHED THE HEATER CORE OUT UNTILL ONLY CLEAR WATER COME THREW IT. I HAVE CUT THE HEATER BOX OUT TO G

i think its blocked with rust where engine has been used with no antifreeze causing corrosion ,check their is no valve thats electricaly operated to shut off water supply and if it doesnt have one then block off bottom hose with mulgrips and use a piece of spare hose on the top pipe and a funnel then mix some 50% caustic soloution and pour into funnel till it shows on the funnel then leave overnight it will either kill or cure one or the other ,old fleet fitters trick so it will not be recomended by the elite pundits but it can work ,make sure you flush well before refitting and if you used mullies on bottom pipe then make sure you remove it to flush it all out ,Try with just plain water first and if it works drain some water out and add at least 3 litres of pure eythlene glycol antifreeze .this will keep system clean and it will not freeze up in the cold .

Posted on Nov 16, 2011

TJ McDonald

  • 136 Answers

SOURCE: I have a 4cyl 1999

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.

Posted on Dec 01, 2011

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1 Answer

I am getting code 54 on my jeep grand Cherokee and I know it my driver side blend door. what im wanting to know is do I have to remove the whole dash to replace or is it behind the glove box


IT IS BEHIND GLOVE BOX.YOU WILL NEED A HEATED KNIFE TO CUT THE HOLE AND TAPE TO SEAL IT AGAIN.A 1 HOUR JOB.CHECK OUT YOU TUBE IT WILL SHOW YOU HOW TO DO IT AND WHERE TO CUT THE HOLE.HOPE THIS HELPS

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it is the heater blend door.....you can buy the piece off ebay for around 30.00 dollars the dealer can charge upwards of 800 dollars to fix because they take the steering column and dash apart...you can go through the glove box and cut a whole into ac system and access the blend door. old one slides out new one slides in this is farely easy and takes less than an hour

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When i turn on the heater it doesnt work but the AC cool works Whats wrong with heater?


Your Jeep has a common problem with what they call "Blend Doors", they mix hot and cold air to what the user put it on.

What you have is an "arm" that pulls on a peg to open and close a door, this peg snaps off over time and must be replaced in order for it to work again.

This issue has plagued WJ Jeeps and requires taking must of your dash area apart.

Yahoo, Google and or youtube "Jeep Grand Cherokee blend door repair".

I hope this helped.
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My 2000 Grand cherokee only blows warm air from defrost or any vent, 105 to 110 on a 32 degree morning with high fan, about 10 degrees warmer on low fan. It gets warmer when it warms up outside.Engine...


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.


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Nov 24, 2010 | 2000 Jeep Grand Cherokee

1 Answer

Were is the blend door located on the 2004 jeep grand cherokee overland


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hi
your blend doors are broken in the heater box, go to heatertreater.net they have a diy fix kit that is the buisness, you can install in around half an hour and really does work
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If ythe heater core is not bad then I would replace the thermostat, this will stop the warm coolant running up to your engine go to the heater core.

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