mud_digger

My jeep keeps getting hot. i pulled the thermostat out so there isnt one in it, has a new water pump, i got a new temp sensor from the JY and I also got a complete coolant system flush as well as a new fan clutch. I cant figure out why its getting hot. Its in the 80's here the past couple days. i can drive about 20-25 mins before it starts getting hot. the gauge gets up to 210 and stays there awhile and then it starts moving up and gets within a neddle width from the 3/4 mark and thats where i shut it down. what is goin on? my elec. fan is working so its not that. im stumped

fishtaconc

did you burp the cooling system? you could have an air pocket. Are the radiator fins clear and not packed with mud or debris?

claygrassmann

burp the system clean the rad a posted ^^^, put the thermostat back in, its what allows the water to stop in the rad to be cooled down, get some water wetter from autozone and but that in, get the head checked to see if you have a blown head gasket, if the head is good then check the radiator, or just replace cause you can get them from ebay for cheap!

mud_digger

i will clean the radiator fins to make sure. how do you burp the system? how would i know if there is a blown head gasket? it runs fine and nothing else happens besides it get hot but i shut it down before it get to the 3/4 mark

fishtaconc

first off put a tstat back in there is a lot of debate over the reasons of needing this, I personally have seen no tstat cause cavitation in vehicles like the XJ with smaller radiators which is basically air pockets.
To burp the system, fill the radiatior slowly till it no longer burps or bubbles wait a minute or two recheck the radiator level then start vehicle and turn the heat all the way to hot let idle with the cap off till the tstat opens then refill as the level goes down until full. look for water in your oil itll look like a chocalate milkshake or white smoke out the tailpipe.

PolarXJ

You can also squeeze the radiator hoses to help remove the air. Be careful when doing this with hot antifreeze, sometimes it will splash out. Also, sometimes it takes a few tries of squeezing the air and taking it for a spin, to get all the air out.

mud_digger

ok i dont think its head gasket because my oil is not milky and the jeep dont smoke. im going to get a new t-stat, water pump, some water wetter, cut off my cat tomorrow. we will see what happens. i am also going to change the opil today and burp the system. anything else i should try?

offroadnut36

Don't cut the cat off. It's a federal offense and your jeep will run a little bit worse.

mud_digger

i have cut the cat off just about all my vehicles and it dopesnt run any different. my buddy has a 93 with no cat and runs fine. i dont think it will cause it to run worse

offroadnut36

It does run a little bit worse. Less backpressure isn't always a good thing. It's been proven that having a bit of backpressure will produce more power than not.

davida

Don't throw it away (The Cat) you might need it in the future, If you don't think it will run any better or worse why take it off? If you want a performance cat you can get one from many sources (I like the one MagnaFlow offers).

davida

Also some Cherokee's have a O2 Sensor that is mounted in the side of the cat, you will have to make a new location for it.

mud_digger

there is no o2 sensor in my cat and i never said it wouldnt run any better. i think it may be clogged a bit, i only said i dont think it will run any worse

mud_digger

im not gonna argue about a cat. i just need help with the cooling issue. i tried to burp it and nothing cam out. im sure when i had my coolant flush done the place did that.

dyte2004

check your bottom hose isnt colasping when your jeep is hot