I have a 2000 jaguar s-type, 3.0 v6. The blower motor works but there is no heat, the system has coolant and the thermostat is brand new. The coolant to the heater core is regulated by an electrically controlled valve that varies the flow. I need the wiring diagram for this heater valve and also any input to what you might think the problem could be

replace thermostat

Did you bleed your system of air???....usually a bleed screw near the thermostat housing...get allllll the air out...simetimes the heater core is at the highest oart if the system..therefore if there is air in system..thats where the air settles and no coolant will flow through the heater cire!!

the 2000 s type 4.0 has a return flo head cooler line under the intake that is not visible. this line is attached to the back of the thermostat and runs to the back of the head and a small leak is hard to detect. if you are adding coolant periodically then I would have this checked. if not, then I would replace the thermostat.

check your starter.....second battery or second alternator?

replace the thermostat in it.

Hello,
Here a two of the most common causes for overheating;

1. Low coolant.

2. Faulty thermostat.

Make sure your coolant level is up to the FULL line on the coolant reservior, ( do not fill completely up or you cauld cause the check engine light to come.)

Check to see if the thermostat is working.

How to test the thermostat in most vehicles;
Make sure the heater is off, start the engine and let it run for 6 to 8 minutes, ( this will allow the
engine to reach, " normal operating temperature "), from the inside of the vehicle turn the heater
temperature on high and turn the fan speed on high.
1. Listen very closely for a click sound from the engine, ( most thermostats make a click when
they open )
2. Watch your temperature guage, it should begin to lower as the coolant starts to circulate.
3. Usually within a few minutes the radiator fan will kick.

I hope this helps you.
Donnie

Check the little pump below the brake booster for running and the coolant valve for movement.

Both hoses to fire wall should be hot.

Check for air lock in system.

Blend doors on this vehicle stop working....common complaint.

To verify Blend door movement, turn on ignition with engine off.

Run temp to max and the min..... listen under glove box for ( sliding ) motor noise as door swings from hot to cold.

This is a digital system needing a Jaguar scanner for diagnosis.

These systems are not a DIY proposition. It is a fully electronic system and only dealership tech's can diagnose your problem.

Unlikely it is a fuse as the systems components are relay driven. Usual problem with this machine is previous overheating melting the coolant flow valve under to hood just in front of the brake booster.

Reduced heat or no heat is often coolant air lock. Blend doors on this model are also a problem.

You may be one of a few who have a bad blower motor. ...but this still needs diagnosis by a tech'.

likely to be paddle flap motor died, they used to be manual, so the vent is letting in cool air only, the flap changes position for the heat to enter, the flap on yours is not moving, so likely to be the motor

2000 S-TYPE JAG 4.0 / MY ENGINE TEMPERTURE LIGHT CAME ON AND I SAW THE NEEDLE GO FROM COLD TO HOT AND THE CAR WAS MAKING A CLICKING NOISE. BESIDES REPLACING THE COOLANT WHAT ELSE COULD BE THE PROBLEM?