Air getting into coolant system - Mondial T | FerrariChat
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Air getting into coolant system - Mondial T

Discussion in 'Mondial' started by UsernameBob, Sep 7, 2025.

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  1. UsernameBob

    UsernameBob Karting

    Jan 21, 2025
    56
    Full Name:
    Rob Dyer
    #1 UsernameBob, Sep 7, 2025
    Hi all,

    Well I seem to be getting one of those head scratchers. Car runs well, but I keep on getting air in the coolant and have to bleed it out from the outlet elbow (where the thermostat is). This is on a Mondial T. Trying to avoid thinking about the head gasket scenario, I am hoping it is just bit sucking in air - accepting that the system should be under pressure, but with water pump and differing flow speeds, perhaps an increase in flow speed somewhere is reducing pressure enough to suck in air. There are no coolant leaks and no coolant in the oil!

    Anyway I looked at the hideous small pipe on the water manifold today, took the pipe off and found it completely blocked (it’s part 45 in attached file). It took a fair amount of swearing and prodding to finally unblock it. So this is the smaller tube that goes to the expansion tank, meaning the expansion tank was only connected by one hose to the engine. I believe I am right in saying that the manifold the small tube goes into is on the outlet side of the engine that then goes either back into engine with thermostat shut, or with thermostat open, then goes on to the radiator. I am not sure what effect having this ‘hot’ side blocked from the expansion tank would do?

    Anyway I will stick it back together this week and test, but it is a nightmare getting the hose clip on with the inlet manifold in place.


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  2. Alden

    Alden F1 Rookie
    Rossa Subscribed

    Apr 25, 2010
    3,712
    Central Florida
    #2 Alden, Sep 8, 2025
    Not sure about your T, but my 3.2 requires some air in the system. If you try to fill it "full" it will expell the excess thru the discharge tube on the overflow tank. "Full" for my car is about 3" below the top of the overflow tank. The repair manual says this is normal.
    Is your car overheating? If not, don't worry about it.
    The 308/328 guys have come up with some crazy procedures to remove all the air from their systems, only to be told by our expert members to stop obsessing about the "air." It's supposed to be there.
    Alden
     
  3. UsernameBob

    UsernameBob Karting

    Jan 21, 2025
    56
    Full Name:
    Rob Dyer
    #3 UsernameBob, Sep 8, 2025
    Yes I have the 2” air gap in the tank, the problem is that air builds up in the elbow above the engine and stops water flowing to the radiator. Having said this I am mildly hopeful now as I cleaned the blocked pipe, stuck it all back together and it seems to be getting better as in she only started getting hot once and a quick bleed and that has not happened again. I think with only one tube from the coolant tank (other being blocked) it was trying to pull from the tank and was sucking in just a bit of air from somewhere. Now both tubes are unblocked, it seems to have fixed - I hope! It would be nice to screw the engine access panel back in and be able to drive without one eye on the temp gauge.
     
    Alden likes this.

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