Cooling Systems....

[ZGR]

Just looking into why my car keeps on overheating... The gauge is right up at about 110 although it does occasionally drop below this. It could be a gauge calibration problem!

There is no steam! But my question really is how should it be set up? I have a '94 400 with PAS, there does not appear to be a swirl pot, just a tank instead. No other places to top up the rad except through this tank - Is this a correct set up?

I checked the tank, empty! Filled it up to about 2/3rds full, take her out for a spin, still showing hi temp on the gauge and on checking, the tank is empty again... no puddles, no steam?? Where did it go?

Am I doing the right thing?? Any input would be appreciated!

[rigga]

Sounds like you have coolant loss issues,temp reads far too high,and the fact you have to keep refilling the system indicates there is a loss of fluid,if you cannot see a leak from the engine then it may well be an internal problem which needs to be checked out properly,ie head gasket or even cracked heads slipped liner issues.....if however the system has been drained at some point,you may have an air lock,but this should have been resolved pretty quickly after few top ups

[GreenV8S]

I would suggest you check for oil contamination in the coolant, have the cooling system pressure tested, after filling / degassing it and getting it warm with the cap off rev it and make sure you don't get lots of exhaust gases bubbling out of the filler. Also check for water contamination (mayyonaise) in the oil although trace amounts are normal if the engine has been run cold so don't be too alarmed if you see any. If in any doubt get the coolant chemically checked for HC contamination (easily done using a block tester).