When i fit my new thermostat is it worth drilling a small hole though the steel plate along side the thermo part ? if so how big 3mm -4mm ?
Its going in a 2l pinto
Thank's Jacko

Not one drilled in mine.

But if you feel the need then I would go for 2-3mm in the flange somewhere.

David

it'll be fine mate

Just put it in

I put a 2mm hole in mine, mainly to cure an airlock problem on my x-flow - the air used to get trapped under the thermostat. In my case, it makes filling the system much easier.

A couple of 2 to 3 mm holes works wonders

You only really need one hole as long as you put that hole at the top but I drilled 3 x 3mm holes equally spaced just to provide a small amount of circulation irrespective of the thermostat condition. This will extend warmup but should help avoid airlocks and will give me more warning of a stuck 'stat.

Many stats come with a jiggle pin fitted as standard. This is designed to allow air to pass but block water flow which releases airlocks without extending warmup time.

HTH,
Craig.