Hi John,
I have found that drilling a 1/16" hole through the thermostat "valve"
cures the no vent problem.
As others have said, there will be about 1/2 quart of expansion from
cold to hot, so underfilling or using a coolant recovery tank are the
only ways to handle this.
Dave Russell
John Harper wrote:
>Sam
>
>Is it possible that you fitted a type of thermostat without a venting
>'jiggle pin'?
>
>I had this problem many years ago. What happens is that with the
>thermostat fully closed and no way for a small amount of coolant to move
>around the system and allow warm coolant to reach the thermostat bellows
>the thermostat doesn't open.
>
>The coolant then boils inside the head. This cases back pressure and
>forces coolant out of the radiator overflow. Eventually steam or hot
>coolant will get to the bellows and they will open.. The system then
>operates normally as you describe.
>
>I suggest that you have a look to see that you have the correct type of
>thermostat fitted.
>
>Regards
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