However, its now overheating on road, and very quickly!
First issue is fan.
...they don't appear to come on at all, however i pulled the plug off the rad temp sensor and they came on. It still overheats with them running all the time, so that's not the cause of the overheating, but is obv not right. I took the sensor out and did the test where you boil it in a pan of water and check resistance at various temps.
....all was correct, so don't think that's the cause of no fans. Whats next most likely thing to cause the fans not to come on?As for the overheating.
...engines runs fine, no leaking from any bit of the cooling system is obvious (tiny small leak out rad, but not to level of losing about 6 litres of coolant i keep having to put in the car!). Pipes appear same temp coming out of and in of radiator when car is warm. Could thermostat be the cause (seems to work as when warm coolant colour changes - i'm only putting in straight water at this point - suggesting to me its 'releasing' coolant into the engine).I'm just trying to work out if i haven't thought of anything easy to check, before i get a block leak test kit to confirm its the headgasket
(compression leaking into coolant)!Suppose other thing is water pump.
...is it possible for one to stop pumping coolant around engine? Or would that be obvious?