dyte2004

i have just noticed that when im sitting in traffic my jeep seems to get hot and coolant is coming out of the overflow on the bottle this only happens in traffic not if im gunning it i have noticed that the second fan the electric not coming on i have searched the forum but all i can find is posts about putting a switch on the fan my question is is the fan suposed to come on or not as i have also read something about it only coming on with aircon it dont come on with this either i have tried hotwiring the fan and it does work i also suspect my water pump as i had a bit of rusty water can the water pump work a little bit or would it just stop alltogether stat seems fine my head hurts any thought would be great
david

a1racer

let me tell you what i did when i had this issue. i replaced the pump the thermostat. and thermostat housing the sensors and flushed the system. also i put new hoses to the heater the rad and any where i could. now i only hit 210 when in traffic or wheeling or going slow and my average temp is about 200 to 195. your best bet if you can do it is to replace the stuff at one time not over months and months that way you have a service record of what you did and when it was done as far as the fan try checking the relays in the under hood fuse box

dyte2004

i will replace the pump as part of coarse but is the fan suppose to kick in or not i have tried swapping the relay with the ac relay as they are the same but as the ac dont seem to work ie no change in engine note when switch on this relay may also be goosed i will sorce a new one

a1racer

does the fan work when you hook it to the battery to test it. and the fan also activates by sensor on the motor for the temp

dyte2004

yes the works when hot wired i just when out there and burped it again just reading from this forum when i put the rad cap back on and squeez the top hose there is cooland coming back to the overflow this is with the engine cold can it be as simple as a rad cap or is this normal

a1racer

if the cap is old yes it can cause issues. but i would still try to figure out why the fan is not working because that is what helps out when the motor gets hot like when you are sitting in traffic. trekker jmm just did a post about how to run a Manuel switch to it a day or two ago. let me try to find it and see if it helps you.

dyte2004

cap looks like a cheap 13psi one i think i read the post your looking for is that the one using the rear screen heater

a1racer

sorry it was howler gt click

dyte2004

after poking about if i remove the plug going to the sensor on top of the thermostat housing the fan kicks in engine fault light comes on so im guessing this sensor could be at fault would anyone agree

a1racer

replace it they are cheap and easy to do. and most likely your issue

dyte2004

cool will let you know how i get on

a1racer

yeah let me know

98 JeepJeep

dont forget to check your clutch fan.......

Mike1998XJ

One one of my 1999 Cherokees I don't have an electric fan. The Jeep was hit in the front and broke it so I just took it out. Don't have a fan shroud on the clutch fan. What I did do was to flush the heater system including the heater hoses to the cabin heater. There was tons of rust in there. I live in Michigan where it gets over 90 degrees in the summer and I have never overheated even in stop and go traffic. Although my AC condensor was damaged in the same accident so I don't use it. The AC is tied in the the electric fan. Did you say you use your AC?

Mike1998XJ

Good Cooling links:
3CORE RAD INSTALL
http://www.jeepin.com/features/gdi/index.asp

AUX FAN TEST WITH A JUMPER
http://www.fivezerofive.com/cpg132/...ls.php?album=81

INSTALLING NEW RADIATOR
http://www.go.jeep-xj.info/HowtoRadiatorFitting.htm

BURPING the COOLING SYSTEM
http://www.lunghd.com/Tech_Articles/...BurpAirMod.htm

CONVERTING THE CLOSED COOLING SYSTEM
http://www.geocities.com/chmwatson/F...ow-bottle.html
http://www.olypen.com/craigh/rad.htm
http://www.off-road.com/jeep/cheroke.../radiator.html
http://www.madxj.com/MADXJ/technical...stemSwitch.htm

WATER PUMP REPLACEMENT
http://jeepin.com/features/waterpump/index.asp

OVERRIDE SWITCH ON ELEC FAN
http://www.olypen.com/craigh/auxfan.htm