Question about 1998 Jaguar XJ8L

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Coolant light comes on

Replaced motor twice-new water pump-new t-stat-new rad cap
drive car a few miles coolant light comes back on
open cap and is low on coolant
after driving coolant seems to be boiling over
original problem with motor was overheating --dealere recommended changing motor --im on third motor now

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  • 92 Answers

Ouch. Been down that road.

Sounds to me like a head gasket problem.

Pull your oil dipstick.

Is your oil watery?

Does your dipstick smell like coolant?

Does your coolant have an oily film on it?

You can have a dye leak test done to confirm it.

Should you be able just to have the head gaskets changed and not the engine, again..insist on thenewest, brand name, top of the line gaskets
available.

Best of luck.

Posted on Oct 02, 2009

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no, not special but you failed to stated engine, there are many engines.
and some are very tricky here, like 2.0L.
First state the symptoms,
your post states its overheating, then no heat. (why?)
old post. but others might
Ill post , overheating ,
Example if me, with overheat.
I see my dash gauge, show overheating and engine power drops and pings, then steam vents from the rad, cap?
Over heating (ill skip cab heater but on 2L this path blocked causes thermostat to go quite nuts. not posting engine, makes this hard.)
1: full of 50% AF (antifreeze)
2: new thermoSTAT they age and fail fast. so get a new one.
put STAT in with the wax slug down, and jiggle bleed pin forward.
get air out of system after filling, (RTM)
start car, and....
4: then using and IR pyro gun we then check that
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run motor till top rad hose gets too hot to touch 180f is normal.
I had to drive 10 miles, to get it up to 180F.
my car has the hotter, 195 STA,T so runs at 195f. (helps cooling)
USING the pyro gun , the top and bottom of each rad tube.
This tool is Amazing.... and saves burn hands.
if the bottom of any RAD tube is way less than the others?, that is
a clogged UP rad tube. solution is , NEW RAD.
Usually rad repairs, are more costly than new. IN USA.
The water pump must spin at full speed, belt tight.
The impeller or some suz, motors likes disappear. from electrolysis action. so not looking at the impeller is a FAILURE on the mechanic side.
if this car has 2.0 I-4 (4 banger) it has a coolant tube on the rear
of the STAT housing, this tube must flow coolant at all times.
if it dont, the thermostat , will go nuts.
nuts means, that insufficient flow passes the thermostat wax block
causing the thermostat to cycle in a wild and random way.
I dont like this design but is reality. If applicable.
post country, post engine type and state the symptoms.

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1) Your car should have a thermostat regardless of what your mechanic says. Fuel injected vehicles run better and more efficient at proper temperatures. So re-install thermostat properly before step 2.
2) Did the mechanic make sure the heater was on high temperature and blower on when he re-filled the cooling system?
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