Overheating problems

[Be30]

Evening
Okayyy, i have an issue with an m52 swapped touring at the moment and i think i know whats causing it but would just like some confirmation/ other ideas about what it could be!
Its overheating basically, but its odd in the way that i can bleed the entire system, have hot air in the cabin etc and leave it running for 20 minutes without an issue. But then if i go back the next day and start it, it will heat up much quicker than normal, no hot air in the cabin and start to over heat at which point i switch it off again.

Its like its de-bleeding itself over night (if thats a word) and drawing in air causing an air lock which would explain the lack of hot air through the blowers? Would this point to some sort of coolant leak? The coolant level doesnt seem to be dropping at all, by looking into the rad at least

Hope someone knows what they’re talking about
Cheers

[BristolE30]

The system is pressurised meaning the water inside wants to leak out, hence why you get leaks. I don’t think it would be possible for a leak to somehow incorporate air into the system due to the pressure forcing water out, rather than anything in. The unfortunate alternative which is likely your case is a leaking head gasket, allowing combustion gases to leak into your water jackets and cooling system.

Buy a sniff test or take to a garage to confirm

[BristolE30]

Either that or it’s just not bled properly

[Be30]

Yep! As suggested i hadnt been bleeding it properly
Runs lovely now ive done it the right way!

[BristolE30]

Yep! As suggested i hadnt been bleeding it properly
Runs lovely now ive done it the right way!

Nice one!

[Brianmoooore]

I don’t think it would be possible for a leak to somehow incorporate air into the system due to the pressure forcing water out, rather than anything in.

Goes into negative pressure (relative to atmos.) when the system cools down, so not totally impossible.

[BristolE30]

I don’t think it would be possible for a leak to somehow incorporate air into the system due to the pressure forcing water out, rather than anything in.

Goes into negative pressure (relative to atmos.) when the system cools down, so not totally impossible.

I guess it wouldn't be circulating though, so not much draw in..