What the heck is going on.

This morning I was driving to work. No problems, turned on my XJ to warm her up while I busted out the ice scraper to clean the ice and snow off the windows. Still no problems.

Get going start driving, about 5 minutes later, the temp gauge gets to about 50%, like always. So I hit the heater and keep going, well usually when the temp gauge hits 50% it will jump down to about 30-40% and climb and drop, its always like this

WELL not today.

It climbs all the way to the top, by this time I am half way to work. on the highway... not good.

So I pull off to the emergency lane, let it cool then limp to the next exit, so I wait and wait, so I turn around and plan to go home and pick up my trans am.

So I get to a gas station and decide to boil off the coolant and fill it with some fresh stuff from teh station. I go in and get some stuff and come out and there is a 4door XJ next to mine with the same exact problem, WTF

He tells me that its a common XJ problem. So now I am home using up my precious comp time, I dont want to go to work anymore, all this frustration.

Any ideas. It was running fine the past week with the same freakin temperatures, I have it filled with 50/50 coolant.

Help would be appreciated.

 

thermostat need replacing?

 

Thats what Im starting to think, too bad my t-stat housing is help to the block by RTV and luck. hahaha

 

 

one idea and i am not too sure on how effective it could be is getting a good cooling system flush,, i heard all the 4.0 cooling systems get clauged very easily just throwing it out there... or you can get a do it your self flush for ten or fifteen bucks at checkers or advanced auto

 

You need to solve your T-stat housing problem first and replace the T-stat. See if that was your problem before flushing it out(seldom helps).

 

its more of a joke than truth about the housing, actually i broke off one of the bolts in the head, so i had to drill it out, so now one of the bolts is a little off center.

 

If it seals then remove the housing and replace the T-stat then report back if that doesn't solve your problem.

 

Well Last night I got the t-stat replaced, I then let it run for about 30 minutes, it got up to 210 then went a little over then cooled again just below 210. Well I started to hear hissing and saw steam, I was pissed, thinking that my head or something was cracked. Well I pop the hood and to my surprise it was just a hose leaking. So I also noticed that my water pump sounded horrible, so I bought that also. I really hope its not just the idler pulley

So I am going to fix what I can today. I guess Im driving the T/A this week.

I will let yall know how it goes.