Such problems are usually caused either by a defective thermostat which is
stuck closed or defective water pump.
Reduced water flow will overheat the head, which will warp it and burn the
gasket. The head temperature sensor might be toasted too, not showing head
temperature.
You should check all those components for proper function, and have the
head
machined flat if required because it will probably be wrapped.
Bill Spiliotopoulos,
'96 XJ,
'06 TJ.
"Noah" <n_o_a_h_2000@[EMAIL PROTECTED]
> wrote in message
news:4806c527$0$12947$4c368faf@[EMAIL PROTECTED]
> 1999 Cherokee Laredo. 4.0 engine. 120000 miles. We've only has this
> thing for a few months.
>
> First - pretty sure the head gasket is blown. There's oil in the
coolant.
> The oil is not contaminated and there has been no loss of coolant. I
> can't think of anything else that might have contaminated the coolant.
>
> What got me looking around was when I went to change the oil, the
plastic
> cap popped right off in my hand. The threaded ****tion is melted into
the
> inlet on the valve cover. We never noticed it running hot and I last
> checked the coolant about two months ago. I pulled the valve cover off
&
> luckily nothing got into the motor.
>
> Could the cover have melted becuase of a blown head gasket?
>
> Thanks!
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