Question about 2000 Jeep Grand Cherokee

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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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