Hey guys, I'm having an overheating problem after changing both of my fans (mechanical and electric) mechanical was actually only the blades part of it I had one that was only 5 blades so I bought a Mopar
new one even with the tag that I found on ebay and the electric I bought this one TYC 620560 .My mechanic was sure it was only a problem of the cap radiator losing presure because it was leaking after
turning the XJ off from there and also from the coolant tank, we changed it with a same 16PSI but Mopar this time (I had motorad before) went out to give it a try, but after 30 min at a slow pace because of traffic
(also was already 7pm so not really warm hour but still), it went from 225 (after second line from 210) to turn on the check gauges light and airbag and drop till the line before 260, I was about to arrive at my place
so I continue driving 5 min after the nail went back to 225, I arrived by then, turned off the engine, and coolant was starting to go out from the tank a lot of it, not from the cap anymore. Also I just checked the fan clutch and
it stills spins after 10 second more or less of turning off the engine, plus when is really warm (over 210) you can spin it with the hand easily and it will do more than a couple of spins (mechanic said that was ok but i dont think so)
I actually bought the replacement for it just now but what do you think? Should I just go full into fixing the problem and maybe replace water pump and radiator from brand new ones? What else could be the problem
since I replace the fans and one could say because of that it has had overheating issue now?

There's no leak from any other place, actually it comes from a lot of work changing gaskets for exhaust manifold, crankshaft, and other fixes like engine and trans mounts (browndog) new sparkplugs (champions bc this forum
recommended), exhaust manifold was welded etc. It has been exhaustive and I'm getting quite frustated about not seeing an end. It is in a much better shape but still, for the amount of money invested thought this overheating problem was in the past.

I will appreacite any help, I'm also attaching video and pics from this recent incident.


Leaking from coolant tank

was on 225 and sudenly to this and did the beep

after that went back to after 210

exhaust welded recently on that area

new electric fan

new mechanical fan (only blades) and shroud

 

Have your coolant checked for exhaust gasses. You may have a bad head gasket

 

You should always replace the WP and radiator if an over heating issue exists, unless you know full well they are good

There is no need to use expensive parts, aftermarket radiator with plastic tanks and a new WP would be less than $200, fit them yourself

 

1) sounds like your fan clutch is shot. shouldn't continue to spin after engine shut down.2)Unless you've done it recently replace water pump 3) make sure you've burped air out of system

 

Certainly sounds like the Fan Clutch needs replaced. It shouldn't be running at all after you shut off the engine, half a second, maybe, and spinning it by hand, it MIGHT move two blades worth...

Renix setups are a bear to bleed the air out of. They don't self-bleed like a regular ol' radiator and cap. On the driver's side of the engine, all the way at the back by the firewall, the Temp Sensor for the Gauge is threaded downward into the head. Park with the nose facing down-hill, or jack up the rear of your XJ, loosen that Temp Sensor just enough to let the air out. When you get fluid, you're done.

 

I looked at your other thread and I think I'd start with the just the fan clutch and go from there if you didn't have overheating issues prior to the mech and electric fan change.
i replaced my radiator with a Napa (Spectra), Napa premium thermostat and Napa water pump. I've had no problems with overheating for go on 3 years now if you decide to go that route.
74Plb

 

Thank you and for also checking my other thread related to this issue and yes it is frustating to have problems that appear all of a sudden specially after improving the parts I thought were bad for the truck
I will try to get some Napa parts, here in mexico is not available, but will see for taxes and delivery prices, like I mentioned I already bought Hayden fan clutch and will do next a thermostat, water pump and probably
radiator too

 

I think I have to do it and a purge of the coolant liquid and refill because check the pics next I found some paint rubbish from the engine (at the beginning of this year was painted in red) on the just installed new radiator cap
and the coolant is all brownish, that would be a good indicator of a bad head gasket to go and replace it for good?

 

Hey Thanks for your answer I will replace fan clutch in a couple of days. BTW I didn't get the second part of your response, I know where the temp sensor is but should I loose it up a bit? or what you were suggesting? should fluid come out of that hole where it is threaded? I also check
for Renix setups but I didn't get a clear idea of how can i improve the air system and with which kind of renix piece. Thanks a lot for the advice, hopefully you can respond to this doubts I'm still a newbie in all this. Cheers!

 

Note from DJ to Rob312

Are you working on a Cherokee 90 Renix or a 1998 Cherokee?
If a 1998 Cherokee pay no attention to anything regarding the Renix series!

 

1998 XJ 2WD Cherokee haha

 

I used this fan clutch it is a little loud but it does cool good .
https://www.rockauto.com/en/moreinfo...&pt=6812&jsn=4

 

DOH !!! Not sure where I came up with Renix...

 

First your coolant and coolant bottle should never be that color if it started out greenish. If your mech fan spins more than 1/4 turn when you shut off engine the clutch is bad. Your 2nd picture with coolant at first notch past 210 should not trip a check gauges light . You prob have a cracked block-head- or head gasket

 

You'll need to bite the bullit on this.
If you plan on keeping it, overhauling your cooling system is a good way to ensure future operation.
It doesn't have to be with top notch parts either, standard replacements will last you long enough.

Continuing to drive when overheating is potentially doing a lot of bad . Your coolant/engine block needs flushed out before you put any new radiator in, if your coolant looks like that.
But most of all ensure any cracks in the head are excluded- otherwise all else is useless.

Three side things though
- airbag light coming on when overheating is not a standard thing afaik
- external (engine) paint making it's way inside the coolant? Unless the block was painted taken apart?
- have the check engine codes read to ensure there are no other issues