William greaves Posted December 25, 2022 Share Posted December 25, 2022 2011 1.4 turbo issue Run car for 8 mins the top hose is hot Cooling fan kicks in but bottom hose is cold but I have a fantastic heater I have changed thermostat no air lock and no oil in water took up the road for but still bottom hose and rad is cold even after 15 mins Quote Link to comment Share on other sites More sharing options...
Vauxhall Owners Club Posted December 28, 2022 Share Posted December 28, 2022 What temperature is displayed on the instrument panel? generally, the thermo-syphon effect within the cooling system means that the top will be hot and bottom will be cold and the coolant circulates (with the assistance of a water pump) within the engine and ancillary items such as the heater. Therefore the bottom hose should be a lot cooler than the top one. If you measure with an infrared temperature gun, the temperature should fluctuate (without any sharp dips or peaks) throughout the engine. Quote Link to comment Share on other sites More sharing options...
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