Question about 2000 Jaguar S-Type

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My s type thermostat keeps going to hot after not even 5 minutes of driving...and normally it goes right back to midway after a few its going straight to hot and not going down..however its no smoke coming from the engine...could it just be a bad thermostat???.....or something else??

Posted by kheat2011 on

  • chargerhp
    chargerhp Dec 30, 2011

    Are your fans coming on at about 200 degrees. When the engine is cold and you start it does the top radiator hose get hot all of a sudden between 180 and195 that would mean the thermostat is opening and working then the fans should come on if they don't there is a problem with the fan. Don't have the air on otherwise the fan will run



1 Answer

Dan Hooper

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I would suggest changing the temperature sending unit on the engine.

Posted on Jan 24, 2018


5 Related Answers


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SOURCE: overheating? s type

Had the exact problem. Turned out that it was the thermostat that needed replacing, relatively cheap and quick by mobile mechanic. Things were fine for a year and the second time it happened I assumed it was the same problem. However, this time the thermostat was fine, wasn't sticking, and I had a slow leak in radiator, losing colant and causing engine to overheat, which paradoxically had stopped the heater working as well. Had to get new hose also by local mobile mechanic and everything seems okay again except for the intermittent "stuck in park" problem that a lot of people are also experiencing.

Posted on Jun 08, 2009



  • 33 Answers

SOURCE: On hot days (high 90's}while driving will start

Without more info, things that come to mind are vapor lock and old spark plug wires and failing fuel pump.
....Could put a wet towel around the carb and fuel lines as a test.
....A partial test of plug wires would be to open the hood while it is running at night---and you can often see the spark shorting out to any nearby metal--and especially if a particularly bad section; remember that they are carbon core which is high resistance (to lower radio interference) and the current path would rather go to metal than down the more resistive path of the spark plug)
..could pull off a connection from the fuel pump to check the pressure, though a bit hard and still keep it running without a tee....should also look for leakage around the fuel pump--often a sign that the rubber diaphragm is leaking/failing.
...all hail the memory of the Rambler..

Posted on Aug 09, 2009


  • 39 Answers

SOURCE: 98 Mazda 626 overheating. Blew off hose and was

Yes, this is most likely a thermostat problem.

As a basic explanation, the thermostat is the device which separates the hot coolant in the engine block from the cool coolant in your radiator. If it gets stuck closed, your radiator coolant will remain at near room temperature, while the coolant in your block (which is what your gauge reads) does not circulate and will skyrocket in temperature.

Posted on Aug 13, 2009

Testimonial: "Very helpful. Discription makes sense/logical explanation of symptoms."



  • 322 Answers

SOURCE: My 2000 Jaguar S-Type High Engine Temperature

I assume the car drives okay the rest of the time at varying speeds and conditions?
It may be you have an air lock in the system (have you had work done or lost coolant?) or the sensor or its wiring is faulty.
Check the level of your coolant tank when the car is at full temp and idling - for safety - the tank is opaque you should be able to see the water level - do not open when hot !

Posted on Oct 21, 2009


  • 263 Answers

SOURCE: my x type 3.0 when driving on motorways,suddenly

change your thermostat it must get stuck time to time,and check your water hoses which get clogged up

Posted on Nov 01, 2009

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