Radiator now replaced. No change (including from a couple of hundred!!)
The thermostat is apparently quite hard to do as it requires the alternator to be taken off and it's accessed from underneath. I have the car at home for the weekend but limited technical capability/tools/time.
In the absence of any better suggestions the next step is to re-replace the stat. The only other bit is the pump which is an expensive job as it involves cambelt removal
Parts replaced so far )in order):
Fan (expensive, def wasn't working)
Thermostat
Sensor
Filler cap
Radiator and bleed cap
Other info
Car is only 2011 with 45k miles
Sniffer in coolant tank indicated no head problem
Water is "active" in tank which makes them deduce that pump is OK (at least at tickover).
All pipes seem to get pretty hot except bottom radiator one which remains almost cold (all being to/from cabin heating, top rad, connected to engine, back to coolant tank)
Temp reduction when cabin heater turned on probably a erd herring as it rose after use in that state
Aircon is not blowing v cold
No visible obstruction on front of aircon "radiator" (which sits in front of the coolant rad)
EDIT to add:
It seems that it will sit all day on tickover with no problem, though that's only properly tested once.
One time when I took it ion the motorway run to test if fixed, I let it stand idling for a while and the bottom hose got hot
Last edited by: smokie on Fri 28 Jun 19 at 13:35
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