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No heat in my 1999 jeep grand cherokee. It broke the blend doors and I replaced them. Still no. Heat. I checked the heater core hoses both are hot when running. I unhooked them to see if the core was clogged, blew air through one and air and antifreeze came out the other. Re filled the system using the air bleeder and funnel on the radiator. What could be the problem?? As far as I can tell it should work.

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  • Brian W Nov 27, 2013

    the blower works fine. i can physically touch the heater core through the access hole i made to replace the blend doors. The rest of the system is 210 deg F and the heater core is cold to the touch

  • Arnie Burke
    Arnie Burke Nov 28, 2013

    new core is needed then-I kno ur thinkn the same-again an involvd job for homemech-test ac evap too--haynes manual from a partstore shows details



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  • 4,536 Answers

Blower motor is probly worn--its a job to replace but inspect heater core and ac evap while in ther-saves $$---a new switch is a must too cause the worn motor drew so many amps it burnt it

Posted on Nov 27, 2013


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Both hoses are hot, heater core not clogged, blend doors work fine (already check via cutting in the assembly for repair), blower works fine, luke warm heat coming out 1999 jeep grand cherokee laredo

ok, its just a heat exchanger.
all that matters for heat is:
1: the engine must reach 180F + and hold, does it.???
we use the scan tool , is ECT reading that, good.!

or hand IR pyro gun,,, pointed at the thermostat housing
then pointed at both heater hoses.... what do they read.

2: the hot water must flow through the core, must.

3: air must flow through said core. (damper or dirt blocking core)

gotta be...

back flush the core? yet? see it flow good?

Sep 01, 2015 | Jeep Cars & Trucks

3 Answers

No heat in 1996 grand cherokee

you could be low on antifreeze/water fluid or you have a blockage on your heater core.. I have a problem with my heater core being plugged.. Try disconnect the hoses to the heater core and see if water will flow through it or you can use air to blow through it.. Good luck

Dec 19, 2013 | 1996 Jeep Grand Cherokee

1 Answer

The heatercore has hot hoes but the heat still dont blow hot

Probably a defective blend door. Are both heater hoses hot? If so, coolant is circulating properly through the heater core.

Nov 20, 2013 | 1999 Jeep Grand Cherokee

1 Answer

My fan works and a little heat comes out after the jeep runs for awhile. i checked the anti freeze and flushed the heater hoses that go into the fire wall but it still isnt working and i checked the...

Did you back flush the heater core? IOW flush it both directions. Are the hoses getting warm/hot. If so you may have a problem with the blend doors. A very common problem with these vehicles. Involves dash removal.

Jan 14, 2010 | 1999 Jeep Grand Cherokee

1 Answer

1996 jeep grand cherokee blower works but no heat. I flushed heater core with hot water, replaced thermostat, and water pump is circulating. Vacuum line?

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.

Jan 12, 2010 | 1996 Jeep Grand Cherokee

1 Answer

Plenty of air but no heat one side of dash use to blow hot air. Now neither side blows hot air. 2000 jeep grand cherokee coolant is fine driver side seat heater doesn"t work air bag light comes on every...

Check to see that the blend door linkage is hooked up. Doubtful it is heater core, as you had heat to one side and not the other. Check coolant control valve linkage, verify it is moving the coolant valve from off to on when you switch temperature from cold to hot. Verify you have coolant flow to the heater core by feeling the heater hoses where they enter the firewall. If all checks out well, then look at hvac controls individually.

Jan 06, 2010 | 2000 Jeep Grand Cherokee

1 Answer

I have no heat blowing out of my '01 grand cherokee, new thermostat, new water pump, and heater core seems unobstructed

are both heater hoses hot if so either you have a blend door problem or you have air trapped in the heater core

Dec 07, 2009 | 2001 Jeep Grand Cherokee

2 Answers

Heat does not work. coolant level ok and temp is ok

Might try checking the temp blend door operation or the temp blend door actuator. If all good there perhaps the control head itself is faulty.

Oct 08, 2009 | 2000 Jeep Grand Cherokee

2 Answers

No heat blows air ac works

2 possibilities. 1 - the heater system isnt getting adequate hot water flow from the engine and not heating the air for your heater to function. This can be due to a defective heater control water valve, a plugged heater core, a disconnected or plugged heater hose.
2 - the system is in fact getting heat, but your heat is bypassed/lost due to dashboard vent and blend door errors breakage common with that era of jeep. have the valve/cor/heater hose flow checked. If that doesnt show issues, have the vent control system checked for blend door or dash door breakage. beware, its alot of labor to change the dash solenoids when they brake, ALOT of labopr (6 hours or more!) so if you are committed to fixing it because a solenoid and/or sensor broke in there, I highly recommend you chaneg ALL solenoids wuith new rather than risk another breaking in a month and the 6 hours of labor must be repeated.

Oct 03, 2009 | 2001 Jeep Grand Cherokee

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