Hi , my 1985 porsche 924s over heats sat at idle after a drive , didnt notice till it was blowing water out the overflow, any ideas , seemed to stay at a good temp when I drove it home after and then

Under the hood, driver's side, up by the windshield. Its got a black plastic lid held on by clips.

run the car with the radiator cap off or the expansion tank cap off, which is part of coolant system and is pressurized, not to be confused with an overflow bottle which is not pressurized, and the heater on high. drain some coolant to allow for expansion. look/listen for bubbles. air from the vents should get hot. give it about 20 minutes

Do a Compression Test on the Engine and see if you have a Blown Head Gasket. Chances are that is what is causing the Overflow... Exhaust Pressure is getting into the Cooling system

Thermostat is located on the inlet side of the water pump and can be removed without removing the water pump using a specially bent pair of snap ring pliers.

The FRONT flap ,the little one. That's the choke and hi idle ,as soon as the car warms up it should be open. The control for that is on the Pass. side of the carb ,Electric heated coil,if it's bad it won't heat the choke up. Might get lucky and it will have 3 little screws you can loosen and back off the speing pressure but the factory riveted them on.

fuel filter, fuel pump, spark plug gap, fuel distributor, in that order.

check crank sensor

try ebay motors united kingdom same engine as 944

it takes quite a while for a diesel to warm up by just idling in order to produce any heat.you have to put them under a load (drive it), before you will get any noticeable heat.if you have a block heater, plug it in 4-5 hours before you plan on driving it and that will definitely help produce interior heat quicker.