2003 Ford KA temp light coming on , but stay on, stop the car goes off!

Car: Ford KA
Year: 2003
Variant: 1.3
Categories: Engine & Drivetrain
TEMP LIGHT CMING ON & STAYING ON, BUT IF YOU STOP PULL OVER LIGHT GOES OFF WHEN YOU START THE CAR
AGAIN AFTER 30SECONDS LIGHT STAYS OFF !.
BUT THE FAN KICKS IN & THE CARS COOLS DOWN, BUT THE TEMP LIGHT COMES ON BUT NO STEAM ,& WHEN THE LIGHTS GOES OFF & YOU REV THE ENGINE IT DOES COME ON .
ITS DRIVING ME MAD JUST FITTED A NEW THERMO & HOUSING WITH SENSOR.,CAR RUNS NOW WITHOUT FULLY OVERHEATING SO THE THERMOS WORKING ,COULD THIS BE A AIR LOCK ,OR HEATER VALUE ,OR HEAD GASKET.
ANY INFO WOULD BE GREAT ,THANKS
Posted: Aug 9, 2015 (8 years ago)
You need a reactive dye test done,
the special liquid in the tester reacts to any combustion gas in the coolant.
if it stays blue then the head gasket is fine,
The tester is 30-40 or so on ebay,
Or try calling round garages,
I typically charge £20 to do the test,
Others may too,
Posted Aug 9, 2015 (8 years ago)
Block test kit , if needed . Probably cheaper to get garage to carry out test as it's not something you would use too often .

http://www.ebay.co.uk/itm/Block-tester-kit-for-petrol-and-diesel-engines-original-BT500-leak-tester-/181059430832
Posted Aug 9, 2015 (8 years ago)
Have you had a look at this similar problem:

This message was auto-generated based on a user suggestion.
Posted Aug 9, 2015 (8 years ago)
OKAY, I TAKEN ON BOARD ALL YOUR ADVICE , I DECIDED TO BUY A COMPRESSION TESTER!
& CHECK THAT WAY ITS CHEAPER THAN THE BLOCK KIT.
ALSO HAS ANYONE USED THE STEEL SEAL? MY PROBLEM IS MY CAR OVERHEATS, SO I CHANGED THE THERMO,HOUSING & SWITCH , THEN THE CAR WORKS OK THEN TEMP LIGHT COMES ON THE FAN KICKS IN THE LIGHT STAYS ON , I JUST SAT IN MY CAR 45 MINUTES & THE CAR WAS REVVING BETWEEN IDLE & 2.5 REVS & THE THE TEMP LIGHT DID NOT
COME ON AT ALL, CARS WARM FANS BEEN ON BUT NO TEMP LIGHT OR STEAM COMING FROM THE EXPANSION TANK IN ALL THE TIME! NO OVERHEATING.
MY PROBLEM
Posted Aug 9, 2015 (8 years ago)
OKAY, I TAKEN ON BOARD ALL YOUR ADVICE , I DECIDED TO BUY A COMPRESSION TESTER!
& CHECK THAT WAY ITS CHEAPER THAN THE BLOCK KIT.
ALSO HAS ANYONE USED THE STEEL SEAL? MY PROBLEM IS MY CAR OVERHEATS, SO I CHANGED THE THERMO,HOUSING & SWITCH , THEN THE CAR WORKS OK THEN TEMP LIGHT COMES ON THE FAN KICKS IN THE LIGHT STAYS ON , I JUST SAT IN MY CAR 45 MINUTES & THE CAR WAS REVVING BETWEEN IDLE & 2.5 REVS & THE THE TEMP LIGHT DID NOT
COME ON AT ALL, CARS WARM FANS BEEN ON BUT NO TEMP LIGHT OR STEAM COMING FROM THE EXPANSION TANK IN ALL THE TIME! NO OVERHEATING.
MY PROBLEM
Posted Aug 9, 2015 (8 years ago)

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