Hi all, Finally got my build running, 1UZ into a 1979 Lotus eclat. After a very long time of fabricating, designing, building, electrical systems, and making a full custom wiring loom it started first click like a new engine. BUT - I'm having trouble with the cooling. The engine starts and runs perfectly, revs ok, and idles nicely, starting about 1200 ish rpm, once warm idles at about 700rpm. No error codes on the engine. I've got a different temp gauge so I'm not sure of the calibration with the 1UZ sender, but the engine warms up and the ECU obviously thinks the engine is warm as it slows the idle to the 700rom idle speed. The gauge shows 80 and up to 90 when running and warmed up. I've not run it continuously for a long time as I'm not convinced about the cooling. However I am not getting any heat to either the main radiator or the heater radiator. The top hose outlet is hot just near the engine, but the radiator is cold and further down the pipe is cold. I figure it must be either: 1 - Lots of air trapped so no water flow - lots went in, about 6 litres, none dripped out of the bottom(!) I've opened the bleed valve at the top of the system after running and cooling down, and only a small amount went in. Heater valve is open (hot). How can I bleed it better? 2 - Water pump broken - how do I establish if this is the case? Run it with a hose off for a few seconds and see if it flows? Thermostat blocked - but this wouldn't affect the heater radiator would it? any suggestions on how to diagnose this and cure it would be greatly appreciated. Thanks, Mat.