heat sink radiator fails to warm up

16 Dec 2008
Reaction score
United Kingdom
have drained the system ( microbore gravity fed with pump) to fit new radiator. All rads heat up with the exception of the heat sink rad next to the immersion tank - any ideas why its not warming up - I have bleed the rad although bleed valve is located in bottom entry port as pipe enters at top?? - so its not going to bleed out air anyway!
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you have an airlock in the pipe that needs to be moved. You can't bleed a radiator from the bottom as air rises! If no air vent at top of radiator then fit one (change plug for air vent) or split the nut.
The radiator should be Top, Bottom Opposite ends (TBOE) with an air vent in the top opposite side to the flow.

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