Hello all, I'm in my where its about 50 degrees., im out fishing and sat in the car for about 15-20 with the heat on, when I shut it off and walked passed, I could hear the antifreeze boiling, the temp was around 210 ish, would this Bc I wasn't moving and no air circulation? I'm going to check the electric fan later. Should I be concerned or is this ok? Thanks for any help. '96 cherokee classic 4.0

 

Boiling noises at 212? Your cap is probably bad. A working radiator cap should raise the boiling point about 3 degrees per pound, so a 15# cap should not boil until 257 deg or better.
If it's leaking instead of holding pressure it'll dump hot coolant into the overflow and since there's no pressure there it'll boil.

 

Yea. The E-fan comes on at 218*....and when you turn on defrost, and on AC, but I think the AC needs to work for it to come on. (not sure there). Something ain't right.

 

Thanks for the help, I'll take a look at during the day

 

First
What are you running as coolant. And how old is it.

Next
What does it look like. Any rust color?

Next
How full is it

Next
What is your normal operating temperature.


You should be fine Untill over 220
If not. You may have a blockage, rust, bad t stat, bad fan, bad rad cap, old coolant, waterpump

If you turn your AC or defrost on. Your compressor runs as well as the e fan.

But just @ idle if you have it on defrost for an extended Time it will cause a lot of heat build up, due to the compressor running. So yeah it was extra hot from no air circulation. But somethings wrong.

But Never should it boil if everything is working right and your not in 100* weather.

 

I recently purchased the jeep, PO put on a new water pump, no rust in the antifreeze, doesn't look brand new but not terribly dirty either, it just did that one time, I was in and out of the jeep whole fishing trying to stay warm. I'm going to give it a once over tomorrow or even do a fluid change

 

Clever catch Radi! (as usual!). (or the gauge/sender is not right). JJ, is your fan shroud OK, and e fan blowing?

 

Are you sure you heard it boiling? Nothing wrong with 210 degrees...maybe you just heard the coolant being sucked back in from the overflow bottle.

 

I would flush for sure, when you do look In the bucket for signs of corrosion. Refill with 50/50 mix.

Its very difficult to refill the xj cooling system. Most people will have trapped air. It requires burping and adding, I'd check daily for 5 days. Unless you have the Wierd filling tools the dealer uses.

 

When my radiator was in bad shape, I would boil @210. After replacement of the ENTIRE cooling system I run at 208 and no boil

 

At first It looked good, upon drain....Rust!!!! I hope this isn't true with yours it was depressing. Damn PO. Makes you wonder why they replaced their waterpump. Lol

 

The E-fan will not come on with A/C if your system is too low on refrigerant, which will cause the compressor to not kick on also due to the low pressure safety switch. Probably a leaky evaporator core, but that's a whole 'nother can of worms.

I can usually hear mine bubbling after running it for a while and shutting it down, but I have a mostly new cooling system and she runs solid at 195-200. I'm sure it's just the reservoir tank. You might be just hearing normal operation sounds.

Replacing the rad cap is usually a good, cheap place to start though for sure.

 

Don't think that's exactly correct as u can pull the a/c clutch fuse, which disables the compressor, but still allows the efan to run when the a/c position on the dash **** is selected. Almost like having a manual and automatic efan switch.

 

Well, my A/C is too low on refrigerant and the compressor or anything won't run at all. The E-fan will come on when the engine runs a little past the 210 mark so that still works. But switching to A/C, no action. A bunch of research led me to believe that the low pressure switch wasn't allowing the system to turn on But, this is also for the 97+ models. Might be a different setup on the previous generation.

Sorry, didn't mean for the threadjack.

 

Compressor also comes on for de frost... Shouldn't need AC for that ...