Jag s type 2001 the water header tank burted en toute and due to coolant the engine management systemreduced engine power until i stopped uppon cooling down i filled with lookwarm water and limped home .after reparing i found that i did not have a heater.the fan blows but no heating.i have bled from the plastic blead point in the top of the main hose,to no avail.suggestions please

There isn't one take off the small pipe on top of header tank when car is cold start car let it run until waters coming out the pipe stop engine replace pipe top up with coolant

Hi there
A bad or worn water pump ,you will either boil the engine water system or loose water or coolant while driving and when you stopped or water [temp] light will come on when it gets down in the header tank,AND
you will hear the grinding noise as soon as you start the engine and the water pump pulley will move about when running and water will start leaking .
Let me know how you go.

remove header tank cap undo drain plug at bottom of radiator and bleed screw at top of radiator once all coolant has drained retighten tthe drain plug pour the new coolant into the header tank waiting for the coolant to drain through system and watch for coolant to come out of the bleed screw , shut bleed screw top up the header tank to the max level replace cap.Now run engine ,dont drive just stay with revs at 1500 open bleed screw to let any trapped air out and wait for the cooling fan to cut in , allow engine to cool down and refill header tank if required and repeat the running/bleeding/fancutting in procedure until when engine has cooled the coolant is near the max mark on header tank

Blockage will cause this, Thermostat, Bad Water Pump, Blown Head Gasket....

HEAD GASKET is the Biggie.. Why did you change the Water Pump?

Pressure from the Engine (Blow by) will do exactly this...

FILL COOLANT SYSTEM UP BY POURING COOLANT IN THE EXPANSION TANK UNTIL COOLANT LEVEL STOP DROPPING IN THE EXPANSION.WHEN YOU POUR COOLANT IN EXPANSION TANK AIR BLEED OFF THROUGH THE SMALL COOLANT LINES GOING TO EXPANSION TANK.WITH PRESSURE CAP OFF RADIATOR COOLANT LEVEL IN EXPANSION IS AT FULL COLD MARK.WHAT YOU TO DO CRANK ENGINE UP LET IDLE WARM UP UNTIL COOLANT DROPS IN EXPANSION TANK KEEP ADDING COOLANT UNTIL STOP DROPPING STAY AT FULL COLD MARK.WHEN COOLANT LEVEL START RISING IN EXPANSION TANK.PUT PRESSURE CAP BACK ON RADIATOR.WHILE ENGINE IDLING WATCH TEMPERATURE GAUGE.IF START CLIMBING TURN OFF ENGINE LET IT SIT FOR LITTLE WHILE TAKE A LARGE RAG OPEN RADIATOR PRESSURE CAP A LITTLE AT A TIME TO KEEP FROM GETTING SCALDING TO RELEASE AIR IN COOLANT SYSTEM.WHEN PRESSURE IS RELEASED OPEN PRESSURE CAP ADD MORE COOLANT IN THE EXPANSION TANK.CRANK ENGINE AGAIN LET IDLE WHEN TEMPERATURE GAUGE START CLIMBING. TURN OFF ENGINE WAIT FOR WHILE BEFORE OPEN RADIATOR PRESSURE CAP.WHEN YOUR THERMOSTAT OPENS WHEN TOP RADIATOR HOSE IS HOT AND ENGINE COOLANT TEMPERATURE GAUGE STOP CLIMBING AND COOLANT LEVEL STOP DROPPING IN THE EXPANSION TANK.ALL AIR IS EXPELLED FROM COOLANT SYSTEM TO KEEP ENGINE FROM OVERHEATING.

check themortast check coolant sensoir and then check water pump water pump 75.00 had same problem hope u can do your own labor

did you replace the thermostst? have you got an airlock in the heater/header tank.

You have a coolant (radiator fluid) leak somewhere. Low coolant will cause you the no heat problem but things could get a lot worse. Have a pressure test done on your radiator. Look for any coolant leaks from your vehicle. If you find leaks, tighten or replace that part if necessary. Also have your thermostat checked as well.

I had the same problem with my 2001 Jag s type v8 at around 100k My mechanic tested my coils packs and replaced 2 of the 8 he said you don't need to replace them until they go bad but that cured mine also make sure you are using premium fuel also could be injectors clogged or water in the tank try fuel injector cleaner it will cure either of these problems

There are only 3 possibilities:
1) Coolant is leaking on the ground - puddle under the car.
2) Coolant is leaking into the engine crankcase - engine oil is "milky" looking.
3) Coolant is burned during combustion process - defective head gasket or intake gasket.
Let me know what you find and we will go from there.
Regards,