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Reply to "Some good...some bad! It passed the MoT test ... But it over heated on the way home."

Do you know what water pump you have installed? Some water pumps have the bypass blocked, mainly Weiand pumps. If you have one of those pumps you can use a regular thermostat, but the bypass could have been drilled... You can also use a plate with just a small bleed hole and then also use a regular thermostat. It is still recommended to use the correct one..
Do you have the brass plate under the thermostat?
This thread has some nice pictures..
http://pantera.infopop.cc/eve/...562/m/7101010346/p/1
The Robertshaw thermostat is considered a high flow thermostat.
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