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Jonathan Kay
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Following Andrew's thoughts in #5 above I wonder if a failing water pump could do this, not enough oomph at idle...

But I'd start with the simple stuff. 

Jonathan

SM25T
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Are all the hoses getting equally hot ? If you have a heater, this is a classic place for an airlock. Any hose cooler than the others once up to temperature will show you the airlock .
Orange
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Thank you for your suggestions, if the cap is faulty does it simply not let any pressure build?

I hope it is not the water pump, that is also new last year! Is there any way of testing this without removal?

Martin

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Yes all hoses get hot when revved but then bottom hose goes cold once thermostat closes and appears reluctant to reopen unless revved again.

Does the thermostat rely on pressure to open?

Martin

Jonathan Kay
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Does the thermostat rely on pressure to open?

Not normally. That's why you can test them with two pans of water.

Jonathan

SM25T
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Is it possible you have fitted the stat back to front ? So the sensing bit is not in the hot water.
Jonathan Kay
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I hope it is not the water pump, that is also new last year! Is there any way of testing this without removal?

Sorry, I don't know.

Don't get too alarmed by this, but:

  1. Why was it replaced?
  2. Does the new one have have a plastic or a metal impeller?

Jonathan

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I don't know, water pump was replaced by GP Sevens at the same time as the Cam belt and thermostat by Nick Potter...I would like to think that they would use quality parts and know which way to put a thermostat in!

Can you even put it in the wrong way around?

Wrightpayne
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I dont think its possible to fit the stat the wrong way around. Drilling a hole in it (highest point when installed) helped my issues along with raising and filling slowly via the bleed tee in the heater loop.

paul richards
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Stat won't fit wrong way round. 

Paul Richards

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