Over heating question...
#1
Member
Thread Starter
Join Date: May 2012
Location: Gilbert, Arizona
Posts: 203
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
Over heating question...
I live in Gilbert, Az. My 99 Cherokee has a new cooling system (within 1.5 yrs, new radiator, therm, water pump, and hoses). I tried to go up north to St. Johns to visit a friend and I overheated about 10 miles outside of Payson (a long stretch up the mountain). The only thing I know that is wrong with my cooling system is the shroud (it's chewed up, cut up, and held on by zip ties by the previous owner). My A/C does not work, so I don't run it. Does the electric fan not run if the a/c isn't running? Should I look into aftermarket electric fans? Will venting the hood make a big enough difference? Any info or help you can give me would be greatly appreciated!!
#2
CF Veteran
Join Date: Sep 2010
Location: Milwaukee, WI
Posts: 21,168
Likes: 0
Received 5 Likes
on
5 Posts
Year: 1987
Engine: Check
I think the efan only runs with the AC, but I could be wrong.
Fan shrouds are an important part of the cooling system, try replacing yours if your sure everything else is working correctly.
Fan shrouds are an important part of the cooling system, try replacing yours if your sure everything else is working correctly.
#3
Seasoned Member
Join Date: Apr 2011
Location: GSO NC
Posts: 328
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
Engine: 4.0L HO
I believe the e-fan will kick on under a few conditions, one is if AC is on, another is if coolant temp is over a certain temp. The XJ 4.0L needs the extra fan under load, or else it will overheat.
You can easily check the e-fan...unplug the coolant temp sensor from the t-stat hsg, the e-fan should kick on i a few seconds. This will also throw a code. If its still not kicking on, try unplugging the fan and running 12v directly to it.
You can easily check the e-fan...unplug the coolant temp sensor from the t-stat hsg, the e-fan should kick on i a few seconds. This will also throw a code. If its still not kicking on, try unplugging the fan and running 12v directly to it.
#4
CF Veteran
Join Date: Nov 2009
Location: The Republic of TEXAS
Posts: 8,172
Likes: 0
Received 14 Likes
on
14 Posts
Year: 1998
Model: Cherokee
Engine: 4.0L HO
I live in Gilbert, Az. My 99 Cherokee has a new cooling system (within 1.5 yrs, new radiator, therm, water pump, and hoses). I tried to go up north to St. Johns to visit a friend and I overheated about 10 miles outside of Payson (a long stretch up the mountain). The only thing I know that is wrong with my cooling system is the shroud (it's chewed up, cut up, and held on by zip ties by the previous owner). My A/C does not work, so I don't run it. Does the electric fan not run if the a/c isn't running? Should I look into aftermarket electric fans? Will venting the hood make a big enough difference? Any info or help you can give me would be greatly appreciated!!
#6
Newbie
Join Date: Jan 2012
Location: Greenwood
Posts: 26
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1995
Model: Cherokee
Engine: 4.0L
you should be able to feel the upper hose. if it's warm when the truck is overheating, it's likely ok; but given that the whole system is relatively new, and that part is not on the replaced list, it might be cheap insurance. There should be a good overheating troubleshooting tree in your haynes manual.
#7
Member
Thread Starter
Join Date: May 2012
Location: Gilbert, Arizona
Posts: 203
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
Trending Topics
#9
CF Veteran
Join Date: Nov 2010
Location: In the middle of Minnesota!
Posts: 5,805
Received 99 Likes
on
88 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
Does it overheat on the highway, only at idle? With any overheating condition, the devil is in the details.
As DJB mentioned, the e-fan should kick on about 218. Be sure that it is.
Even though your cooling system components are relatively new, don't get tunnel vision and think that they can't fail. They can. If your cooling system is clean and you are having trouble on the highway with temps, I'd suspect the water pump more than any other component.
Don't forget about your radiator cap. Replace it. It is a critical component and often overlooked.
Good luck!
As DJB mentioned, the e-fan should kick on about 218. Be sure that it is.
Even though your cooling system components are relatively new, don't get tunnel vision and think that they can't fail. They can. If your cooling system is clean and you are having trouble on the highway with temps, I'd suspect the water pump more than any other component.
Don't forget about your radiator cap. Replace it. It is a critical component and often overlooked.
Good luck!
Thread
Thread Starter
Forum
Replies
Last Post
LittleRed94
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
5
10-06-2015 08:09 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)