Hi all I just had the timing belt changed on my TT - water pump, high flow thermostat and belts were also replaced. The temperature use to sit about half way and never had a problem but on the way home it was almost at the maximum reading in slow traffic or when idling. Taking it back to the mechanic but any ideas what the problem might be would be appreciated. Rob
Could be any number of things (see check list below) but reliance on the oem temp gauge is a recipe for disaster. It is a poor indicator and you should look at getting a decent aftermarket gauge for your zed Did you check the thermostat operation before installation ? Is all the air bled out of the system ? Was coolant used when radiator refilled ? Is water pump or fan belt slipping ? Is viscous clutch functioning correctly ? Are the fan shrouds fitted correctly ? Is your timing still @15 BTDC ? Was water pump fitted oem or aftermarket ?
To get the air out, run the front up on ramps, open the radiator cap start the engine, let it idle until its up to operating temepture. If there is air in the system the cooliant level will drop, top it up until the level stays constant. Always use a Nissan water pump.
There was air in the system - had to add 1.5 litres. Temp seems fine now so looks like that was the problem. Thanks to all for the advice.
I agree with Rob260. Air in the coolant circuit, its a trap for unknowing players. Nose the car up on ramps or something, turn the heater on to full and crack the bleed screw on top of the radiator.
