Question about 2000 Jeep Grand Cherokee

2 Answers

If my top radiator hose gets hot and not my bottom one is that a sign of a bad thermostat

We took our 2000 jeep grand Cherokee to have the heater core checked. too expensive to fix so we bypassed it. now it overheats. the top radiator hose gets hot but not the bottom one. does this mean we have a bad thermostat?

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  • Jeep Master
  • 5,568 Answers

Apollo's answer likely correct but can also be caused by an internally delaminated hose or severely blocked radiator.
Flow diagram attached-

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if my top radiator hose gets hot and not my bottom - 25291516-40zudchujnybsp30ug2lmjpg-5-0.jpg

Posted on Nov 22, 2014

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  • Contributor
  • 31 Answers

Sounds like a stuck close thermostat.

Posted on Nov 20, 2014

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Posted on Jan 02, 2017

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SOURCE: 2000 jeep grand cherokee v8/heater core

Yes it's the heater core, It's a complicated diy job and unless you are an experienced mechanic you are going to need a good workshop manual for the job.

Best of luck.





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Posted on Oct 22, 2008

  • 45 Answers

SOURCE: Heater Core replacement

yes you do have to disconect the a/c system.google dash removal for jeep.hope this helps

Posted on Oct 04, 2009

wracefans24
  • 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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SOURCE: 2004 jeep grand cherokee overheating.

Are you losing coolant. If you are I would check your heater core which is located under the glove compartment.

Posted on Feb 05, 2010

  • 593 Answers

SOURCE: Heater Core in Jeep Grand Cherokee 1999

Unfortunatly, those are the classic symtoms of a bad
heater core. But just to be sure, check the heater hoses at the firewall and make sure that a loose clamp is not allowing coolant to spray into the car.
I don,t know what the part costs, you can find that out by calling autozone/napa or any parts store.
But there probably will be a slight markup by who ever is to do the job. As for the labor, the book allows
5.9 hours for the job. This will give you a place to
start when you check around for the best price.
If you have a mechanic that you use often(and trust)
ask him/her what it will cost. It's not strictly dealer.
Hope this helps.

Posted on Feb 28, 2010

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2 Answers

If my top radiator hose gets hot but not my bottom one does this mean my thermostat is bad


I don't know how did you test your radiator but if you apply below steps you can clarify your problem easier.

If you want to test your radiator:
A) Park your car (it takes more longer to get real temperature values, if the car is moving)
B) Start the engine (don't forget to engage handbrake)
C) Wait around 10 to 15 minute
D) If your top radiator hose gets hot and bottom radiator hose gets warm; your radiator is functional. (In few minutes your radiator fan suppose to work)

If bottom radiator hose is still cold, it means there is a problem at thermostat. If you see any leakage at thermostat housing at the end of above step C, you need to renew thermostat housing gasket too. Even if you buy new thermostat, i suggest you to test it before assembly. If new thermostat doesn't open enough, your car may run so hot.

If you would like to test your thermostat:
A) Boil water in disposable bowl (thermostat may exposure chemical substances)
B) Put thermostat into boiling water.
C) If thermostat opens totaly, it is ready for assembly.

top-radiator-hose-gets-hot-but-not-3h5pkc2unruv115jj1tsixdi-5-0.jpg

Nov 20, 2014 | 2000 Jeep Grand Cherokee

1 Answer

98 grand cherokee little heat.heater hoses hot top rad warm bottom is cold collant barely luke warm


While it doesn't seem likely, if you've changed, or had the thermostat changed.... I'd say you got a faulty thermostat. I am curious as to what your temperature gauge says the temperature of the engine and coolant is.. If your gauge is showing hot, I can think of two more possibilities... the water pump isn't pumping right... and, if the water pump isn't working right, the problem can be a cracked head or block, which can cause an airlock in the coolant system. Check the coolant or radiator cap.

Nov 14, 2013 | 1998 Jeep Grand Cherokee

1 Answer

Heater blows cold air


soun ds like heater core is plugged. did you try back flushing the system?

Sep 27, 2012 | 2005 Jeep Grand Cherokee

1 Answer

Heater won't go to full hot have air but little heat


Check your thermostat. Put a meat thermometer in radiator start engine wait till top radiator hose gets hot it should be 180 or better if not replace. If it does get hot flush the heater core by disconnecting the two hoses and hook a garden hose to it and back flush it. If no heat now your doors are not working under the dash

Dec 01, 2011 | 1995 Jeep Grand Cherokee

1 Answer

My heater won't get hot


Make sure if both the hose pipes are hot to touch if the bottom hose is not hot as the top one then change the thermostat, if they are both hot then you have a bad evaproter, air in the system or leak in the system. Try changing the radiator cap before you do any thing else.

Oct 05, 2011 | 2000 Jeep Grand Cherokee

2 Answers

My 2000 jeep grand cherokee has an overheating problem, replaced radiator ,hoses and thermostat , but still runs hot


Is the fan working properly? Is the radiator flowing correctly? Does the rad cap hold the proper pressure?

Aug 21, 2011 | 2000 Jeep Grand Cherokee

4 Answers

Changed thermostat and upper hose. found pin hole in hose, but this should still not cause no interior heat should it?


I had a camaro do the same thing and it was the heater core plugged with brown gook! I took the hoses off the heater core on both ends and put the hose in one of them until water came through the heater core. It took a little time but in became unclogged in a few. Brown water for a bit. Then reconnect and see if you get warm air for your heater. Hope this works.

Jan 22, 2011 | 1994 Jeep Grand Cherokee

2 Answers

99 jeep cherokee no heat but blower working


now there are several thing you need to check( since you know the blower and vents are working) start the jeep. let it warm up, sorry to do this to you, but turn on the heater. under the hood are two hoses going to the heater core, by the blower. after the jeep has warmed up, and heater running for about 2 minutes, check to see if either hose got warm or hot. If yes, bad heater core. if no, then the control valve that allows hot coolant to the heater core is bad. you can trace it if you follow the line to the engine, it is connected to a valve, and valve needs to be replaced( you can get it at the auto parts store). hope this helps you

Jan 15, 2011 | 1999 Jeep Grand Cherokee

2 Answers

My 1994 jeep grand cherokee laredo is running hot


could be a lot of different things. bad heater core, cracked, ripped, or soft hoses, crack in the radiator, bad thermostat, clogged lines. next time you run the vehicle, try to see if you can see under the hood to see where the steam is coming from. that will help you to see if there is a bad line or hose. then try to flush the radiator to see if there is a clog in the lines. then go to get a new thermostat if none of those. then you get into the more expensive items the heater core and the radiator.

Jun 24, 2009 | 1994 Jeep Grand Cherokee

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