gw204
NAXJA Forum User
- Location
- St. Leonard, MD
My '00 4.0 XJ started running a bit on the hot side this summer with highway temps right around 210 and idle temps about 220. So, I started with the easy stuff and recently flushed the system, installed a new 195 degree t-stat and refilled. The old coolant that I drained out was pretty nasty. While that did help, it's still not running as cool as I would like. Highway temps are registering about 198 on the gauge (which I'm happy with), but as soon as I get stuck in traffic, the temps goes back up to around 220. It will drop back down once I get moving, but it comes down very, very slowly.
I also made an attempt at cleaning the radiator by powerwashing from the engine-side, but I didn't get any significant amout of crap out, so I don't think there are any blockages in between it and the AC condenser.
To the best of my knowledge the radiator, fan clutch, hoses and water pump are all original and now have 150K on them.
This weekend, I am going to clean/degrease the engine. I have had a leaking valve cover for quite a while now and it's pretty dirty. I can't help but think the oil and grime on the engine woud insulate it somewhat from airflow.
So, I'm wondering what you guys think my next step should be? I've read about the ZJ fan clutch upgrade, but don't want to blindly throw "upgrade" parts at it without knowing the true source of the elevated temps.
Thanks.
I also made an attempt at cleaning the radiator by powerwashing from the engine-side, but I didn't get any significant amout of crap out, so I don't think there are any blockages in between it and the AC condenser.
To the best of my knowledge the radiator, fan clutch, hoses and water pump are all original and now have 150K on them.
This weekend, I am going to clean/degrease the engine. I have had a leaking valve cover for quite a while now and it's pretty dirty. I can't help but think the oil and grime on the engine woud insulate it somewhat from airflow.
So, I'm wondering what you guys think my next step should be? I've read about the ZJ fan clutch upgrade, but don't want to blindly throw "upgrade" parts at it without knowing the true source of the elevated temps.
Thanks.