have esc cos with mountune engine-all the right bits fitted including swirl-pot, after a short run get gurgling in header tank, long run you can hear it boiling. Could it be air lock even with pot fitted? Temp gauge remains normal car runs ok, only done about 5k since rebuild by mountune, previously changed rad and matrix.
Is this usual- any ideas

 

there is a bleed nipple bolt on the front of thermostate hsing worth a run up and try that!

 

Quite common for the turbo to boil the coolant after shutdown. Had this on Sierra and Escort Cosworths (and MR2 turbo) even after letting the car idle for a bit after the run. As long as the temps are OK and you aren't losing coolant it's probably nothing to worry about.

 

Is there a bleed nipple on 2wd cossies ?
I have just replaced the temp sender and my gauge is indicating between the N and O under normal driving (quite high on the gauge). Is this anything to worry about?
I have 500 cooler infront of rad, turbo cooler rad, swirl pot, heaters in car get very hot.
Cheers

 

I've heard that the difference between the "M" and the "N" is not more then 1 or 2 degrees..

Allthough I agree that between "N" and "O" is a bit high, I only get it at heavy traffic (saff 2wd)

 

The coolant can simmer from the turbo heat but boiling sounds like a possible head gasket problem

 

but if its doing it when teh engine isnt running - i'd say its the turbo boiling off the colant in the core....