I have just bought a new expansion tank and cap.

Tiny
ANONYMOUS
  • MEMBER
  • 2008 FORD FIESTA
  • 52,000 MILES
I have just bought a new expansion tank and cap because there was a hissing and I was always topping up. I warmed the car up and coolant came out of the cap after topping up to the max line.I refilled and drove to Wigan from Leeds and back and checked level the morning after and it was very low but there was no audible hissing but pressure was still there. Is it possible its natural level is loe and its using all the spa ce in the tank to expand? It looks like its circulating as it should. Its a diesal and what colour should exhaust smoke be? Thanks
Wednesday, October 31st, 2012 AT 6:14 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
The coolant will expand when hot and contract back when cool, that's normal, the system runs under pressure as when a pressure is applied to the coolant it raises the boiling point if it is not using coolant and keeping between the high and low mark in the surge tank that's fine, a diesel engine smoke will be black on start up (over rich for cold start up) and it should be a dull grey hot running, if blackish the injectors may need servicing, if white this can be low compression issues also if white due to low comp problems the exhaust will smell strongly of raw diesel and it will sting the eyes some what.
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Wednesday, October 31st, 2012 AT 7:55 PM

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