Quote:
Originally Posted by mss
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?
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In actual fact the vacuum at the manifold will be lower as the bypass system will effectively open the throttle slightly to keep the idle correct during the extra load from the air con.
This means you'll have slightly less vacuum.
As regards the OP, the extra load ontberngine, coupled with the extra head at the condenser in front of the main radiator, means lots more heat, which will need to be dissipated, with this in mind, the engine will I evitably get hitter,cleaning more chance of steam coming from the expansion cap. Where are you topping the expansion tank up to, remember, it only just needs to cover the webbing at the bottom of the tank, any more that that and when the coolant expands, it's simply going to blow past the expansion cap.