Need help jeep overheating and no heat out of the vents.

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02-20-2021, 05:57 PM

#16

Trace Lansdell

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Join Date: Feb 2021

Posts: 1

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Model: Cherokee (XJ)

Quote:

Originally Posted by jeepxjho

Need some help guys.

My jeep is a 2000 jeep wj with the 4.0

I was coming home from work today cruising around 60 on the highway and my heat just quit blowing out of the vent then came back for a second then was gone and about 1 min later my guage light came on and the jeep was pushing 240 degrees for coolant temp.

So i pulled over and popped the hood and coolant was just bursting out of the over flow but other then that no hoses were torn other thn the upper radiator hose looked like it was going to explode.

I had my wife pick me up and came and got it about 30 mins later and drove it home which was about 2 miles away and stop by the carwash to hose off the engine so i can look to see if coolant was leaking anywhere else when i got home.

Well after it cooled off an the engine was clean i filled it up with coolant and started it up it took only about 2 mins for it to reach 240 and climbing.

Coolant was bubbling out of the over flow again but know where else and there was also no heat at all coming from the vents and the heater core wasnt leaking and no smell of coolant from the vents.

Also there was no smoke at all form the exhaust or the engine running rough so i dont think its a headgasket.

SO i really need some help after about 4 hours i started it up again and there was a horrible screching noise coming from the front of the engine i couldnt tell if it was a water pump or not so just wondering what you guys think.

The symptoms are .

1. engine overheats with in about 5 mins of being totally cold at idle.

2. the upper radiator hose feels like its going to explode.

3. coolant is bubbling out of the over flow when its running.

4. horrible screeching noise from the front of the engine just started after leaving it sit for a few hours.

5. And no heat at all from the vents.

Also the tempature out side is about -5 F so thats why the no heat is very important.

alright I’m having the same issues with my 2007 Cherokee I replace water pump and radiator and thermostat and thermostat housing and still gets hot quick and no heat but water is leaking now says transmission over heating I don’t know what to do I’m thinking about having a bonfire with it

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02-28-2021, 08:41 PM

#17

2DrXJRegulatorFix

Junior Member

Join Date: Apr 2020

Location: New York

Posts: 77

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Year: 2000

Model: Cherokee (XJ)

Engine: 4.0

OP you need a radiator. Pressure to the upper radiator hose means the pump should be working. Hot upper radiator hose means your thermostat is working. Feel your lower radiator hose for temperature. If it's cool you definitely have a blockage in the radiator.

Quote:

Originally Posted by metzintg

I am having similar problem in my 2000 Cherokee. Replaced temp sensor, thermostat, radiator, hoses. Flushed multiple times, drilled recommended hole in top of thermostat for venting, burped system, checked flywheel on water pump - no looseness in the shaft and it spins freely. I did find out yesterday that I have no heat. The top hose to the heater is hot but the bottom is cool. Would a blocked heater core cause the entire engine to overheat. What is next? Any suggestion?

Blocked heater core wouldn't over heat the engine. You probably need a radiator too. Disconnect the engine sides of your heater core hoses and back flush them with the garden hose into a bucket. You should be able to free up something in there so you get some heat.