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MSS · 28th July 2019, 15:52

This is a long shot.

The additional load placed on the engine when the aircon is drawing power will lead to a larger vacuum in the inlet manifold. Could it be that as a result of this larger vacuum, a small amount of coolant is being sucked in past a marginally sealing IMG?

28th July 2019, 15:52	#10
MSS This is my second home Rover 75CDT, Jaguar XF-S 3.0V6, V'xhall Omega V6 Estate, Twintop 1.8VVT, Astra Estate and Corsa 1.2 Join Date: Dec 2007 Location: Suffolk Posts: 7,085 Thanks: 283 Thanked 624 Times in 440 Posts	This is a long shot. The additional load placed on the engine when the aircon is drawing power will lead to a larger vacuum in the inlet manifold. Could it be that as a result of this larger vacuum, a small amount of coolant is being sucked in past a marginally sealing IMG? Last edited by MSS; 28th July 2019 at 16:06..