Thread: Air in coolant system - grrr

same as all cooling systems.....

park it so the filler is the high point, in nuetral at high idle and up end a 2l coke bottle full of coolant into the filler neck and turn the heater controls on flat out.

300Tdi D1's are pretty hard to get the heater air lock out of sometimes. I have had to drive up and down and around and around a hilly, twisty section of local road in order to bleed them out before now

JC

Thanks guys

I took it for a drive and left it parked nose up (about a 15 deg angle) in the driveway overnight with the coolant tank cap off and the thermostat brass plug unwound in the vain hope that the air bubbles will work their own way out overnight (wishfull thinking perhaps ).

I'll try lifting the coolant tank up, with a fast idle and heater on full tomorrow, although I didn't think the heater being on was that important, because the heater matrix is always in the system isn't it (ie no heater valve or switch)??

Cheers

Goldey

Certainly, heater is always in the system, I think what Dave meant was that you know it is bled out when the heater blows hot air.

JC

Thanks JC and Dave. Both of your advice is always well received .

Cheers

Goldey

If the reservoir level is good, then, with removed thermostat housing plug, you can turn on the engine and screw the plug when water is reaching the upper surface.
The water pump is then free from bubbles, and the pressure it produces by turning shall blow water trough the heater.
If not, i´m afraid it can be clogged. You can check this by running water trough the heater: it is easy to follow and find both hose ends approx over the water pump.

Good luck and regards