Question about 2000 Jaguar S-Type

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1999 S Type 4litre V8 2mths ago fan stays on after switching engine off. fan stops after 4mins. I gather this is normal under extreme conditions. this should not happen after a 2 mile trip. The radiator sensor and module have been changed but the fault remains. Please can you offer some advise? Thank you Ernest Roberts

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  • ernesterober Aug 03, 2009

    radiator sensor and module replaced - fault persists

    Car temperature gauge reads normal



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If im not mistaken its a fail safe system its designed that way the fan will run until the engine cools down to a certain temperature i believe its around 150degrees yours may be a little different or it could be the signs of a early break down the sensor may be failing. hope this helps.

Posted on Jul 04, 2009

  • Katdaddy21 Aug 04, 2009

    your fan relay may be malfunctioning it could be sending a bad signal to the ecm causing your problem and its not unusual to get a faulty part you may have gotten a dud when you purchased your sensor.



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The fan is only supposed to come on when there is excess heat .. in normal driving conditions it doesn't start. When you start your car in the morning the fan won't come on because the engine is cold.

With a hot engine - and it depends how hot the engine is - the fan will only kick in to prevent overheating. In heavy slow moving traffic or a traffic jam, the fan will kick in if needed.

The air flow through the radiator is usually sufficient -in normal driving conditions - to cool the engine.

When you park up and the car has a hot engine, the fan will kick in. This is perfectly normal. It is caused by a surge of hot coolant triggering the fan sensor. Perfectly normal.

The fan then should cut out after a while .. maybe 2-3 minutes at the most. If the fan runs continuously that suggests a fault in the temperature sensor switch.

Next time - wait by the car and see how long it takes for the fan to quit after you have parked up. It should stop of its own accord after a couple of minutes.

If the fan cuts off after a short while, and your battery is becoming drained, that's probably a battery or alternator fault.

Remember: when you start the car the fan won't kick in at idle speed because the engine is COLD, and there is no reason for the fan to start up ..
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Both fans, motor and A/C is not working properly.

hello yafrivera,

does your car's engine is straight to the radiator?. meaning does it has its mechanical fan attached to the water pump of the engine?

if that is the case, then the ac fan that you are reffering to is the auxilliary fan where in it is triggered by the high pressure switch.

that is just normal for that fan to run at 350 psi then turns off at below 200.

that only means that you are low on gas because the normal pressure of the condenser is 250 psi.

if you are under charged, the pressure drops below 200 and cuts the fan, as the fan stops, pressure again shoots to 350 and triggers the fan back on, and so on..

but if the charge is correct, as you turn it on the first time, the pressure shhots to 350, cuts the fan on, pressure drops to 250 at full charge then the fan would no longer stop.

i hope i was able to solve your problem...

pls rate me



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