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Jeep Cherokee Overheating

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Orangeamc13
Got Rev Limiter?
Got Rev Limiter?


Joined: 20 Feb 2006
Location: East Springfield, Massachusetts - U.S.A.

PostPosted: Mon Sep 17, 2007 9:29 am    Post subject: Reply with quote

JIm1973 wrote:
Wiring your radiator to run nonstop is not a solution, it is a temporary fix.


With a switch it does not run non-stop. You control when it is on or off. For me this "temporary fix" has been working 100% fine since I installed it, over 2 years ago. My 99 runs at 210, but when I get on the trails it sometimes goes a hair over, that's when the switch really comes in handy. Mud in the radiator fins is a definite cause for the temp to rise. How do you keep the temp down in the woods when the fins are caked (especially in the peak of summer) and the needle starts going over normal operating temp? Occasionally when I'm in the city, outside temp ~90, and in stop and go traffic, the needle goes past 210. Again, it works great! I would recommend this switch for any XJ. The fan is still controlled by the a/c, but when the switch is flipped you can run the fan whenever wanted, even with the a/c off. Twisted Evil
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Grey Mountain
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Joined: 27 Aug 2007

PostPosted: Wed Sep 19, 2007 2:04 pm    Post subject: Reply with quote

Had a new radiator installed, problem is fixed. This after two flushings, replacing the thermostat, replacing the water pump, replacing the fan clutch.
Replacing the radiator was a bit beyond my mechanical abilities, so had it done by my mechanic.
Now another, possible related problem - no hot air coming from the heater. Could the heater coil be clogged up?

Lonnie
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88WOWJ
Member


Joined: 12 Aug 2006
Location: Hinesville Ga

PostPosted: Sat Sep 22, 2007 4:26 am    Post subject: Jeep Cherokee Overheating Reply with quote

Yes the heater core could be clogged??
Dont frit yet.
The heater control valve maybe stuck or not getting vacum for it to open.
Check the heater control valve first.
Then go the route of the clogged heater core.
I dont know your year so I could not tell you the local of the valve.
Generally follow the hose that comes off of the thermostat housing and it will lead you to the heater control valve. A small looks like a can with
heater hoses attached with a vaccum line coming off of it.
You could blow out the heater core by removing the lines at the fire wall
and with compressed air blow air thru the core. be careful as this can damage the core with to much air. I have done this and it worked.
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1988 Wagoneer Limited XJ Tellico Tested
Rocklizards panels, Tomken rear bumper and front Tow brackets, Rocket air intake, 2 inch lift,
30x950x15, 1991 coolant system with electric fans, 8,000 mile marker winch
1991 Cherokee Limited
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88WOWJ
Member


Joined: 12 Aug 2006
Location: Hinesville Ga

PostPosted: Sat Sep 22, 2007 4:26 am    Post subject: Jeep Cherokee Overheating Reply with quote

Yes the heater core could be clogged??
Dont frit yet.
The heater control valve maybe stuck or not getting vacum for it to open.
Check the heater control valve first.
Then go the route of the clogged heater core.
I dont know your year so I could not tell you the local of the valve.
Generally follow the hose that comes off of the thermostat housing and it will lead you to the heater control valve. Looks like a can with
heater hoses attached with a vaccum line coming off of it.
You could blow out the heater core by removing the lines at the fire wall
and with compressed air blow air thru the core. be careful as this can damage the core with to much air. I have done this and it worked.
_________________
1988 Wagoneer Limited XJ Tellico Tested
Rocklizards panels, Tomken rear bumper and front Tow brackets, Rocket air intake, 2 inch lift,
30x950x15, 1991 coolant system with electric fans, 8,000 mile marker winch
1991 Cherokee Limited
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quadna71
Member


Joined: 02 Jan 2004
Location: Delaware

PostPosted: Sat Sep 22, 2007 6:53 am    Post subject: Reply with quote

for cleaning out the heater core you can also pull the hoses from it (where the two enter the firewall) and flush it with regular pressure from your garden hose. run the water through both direction - normal and reverse flow. you'd be suprised how much crap will come out of there in reverse flow. reconnect the hoses, rebleed everything, and try it then. if it you had steady flow coming when flushing with both directions and still no heat then i'd look at other issues (like the valve).
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Grey Mountain
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Joined: 27 Aug 2007

PostPosted: Sat Sep 22, 2007 5:33 pm    Post subject: Reply with quote

This is a '99 Jeep Cherokee.
I'll give your suggestions a try. Remember that in my earlier post I stated that as a mechanic I'm a pretty good woodworker.

GM
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swataz
Member


Joined: 22 Jan 2008

PostPosted: Thu Jan 24, 2008 3:01 pm    Post subject: Re: Jeep Cherokee Overheating Reply with quote

88WOWJ wrote:
Yes the heater core could be clogged??
Dont frit yet.
The heater control valve maybe stuck or not getting vacum for it to open.
Check the heater control valve first.
Then go the route of the clogged heater core.
I dont know your year so I could not tell you the local of the valve.
Generally follow the hose that comes off of the thermostat housing and it will lead you to the heater control valve. Looks like a can with
heater hoses attached with a vaccum line coming off of it.
You could blow out the heater core by removing the lines at the fire wall
and with compressed air blow air thru the core. be careful as this can damage the core with to much air. I have done this and it worked.


I have similar issues and a 1999 WJ 4.0L 6 cyl...can you pinpoint where the heater control valve would be in this kind of truck provided I am too dumb to find it? lol
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Grey Mountain
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Joined: 27 Aug 2007

PostPosted: Thu Jan 24, 2008 3:32 pm    Post subject: Jeep Cherokee Overheating Reply with quote

After replacing most everything, I pulled the heater hoses and flushed out the hoses and the coil with a garden hose. A plug of "gunk" came out one end. That gunk had effectively stopped circulation of water; thus, got no heat.

Works fine now.

GM
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swataz
Member


Joined: 22 Jan 2008

PostPosted: Thu Jan 24, 2008 6:40 pm    Post subject: Re: Jeep Cherokee Overheating Reply with quote

Grey Mountain wrote:
After replacing most everything, I pulled the heater hoses and flushed out the hoses and the coil with a garden hose. A plug of "gunk" came out one end. That gunk had effectively stopped circulation of water; thus, got no heat.

Works fine now.

GM


I am probably going to do what you did...but I have to ask you, did your lack of heat problem come on suddenly or gradually?
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Grey Mountain
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Joined: 27 Aug 2007

PostPosted: Thu Jan 24, 2008 6:54 pm    Post subject: Re: Jeep Cherokee Overheating Reply with quote

swataz wrote:
Grey Mountain wrote:
After replacing most everything, I pulled the heater hoses and flushed out the hoses and the coil with a garden hose. A plug of "gunk" came out one end. That gunk had effectively stopped circulation of water; thus, got no heat.

Works fine now.

GM


I am probably going to do what you did...but I have to ask you, did your lack of heat problem come on suddenly or gradually?


I'm not sure when the blockage happened. We were on vacation on Vancouver Island in British Columbia when I noticed some overheating. I put some stop-leak in the system (which probably caused the blockage), and when we returned home, I started replacing everything. Finally, a new radiator took care of the problem. It was summer, so didn't notice the lack of heat until colder weather got here. If I had to guess, I would guess the blockage occurred when I put the stop-leak in the system.

GM
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