No hot air & clicking sound

[bennesspipers]

Iv just replaced the water pump, & iv squeezed what air i can out of the system, but there's no hot air coming through the heater. And at the back left of the engine bay there is a electric clicking sound. Whats going on, any ideas ?

 

[BlackC55]

Fill with coolant. keep it on hot. Drive it for 5 mins. Done

 

[bennesspipers]

Unfortunately iv done all that for 20 minutes, & the heaters still stone cold. Is there a tap or bleed valve anywhere ?

 

[BlackC55]

Nope.

have you put the belt on right? (WP turning the right way)

Take the top hose off and fill it up. This might help

 

[bennesspipers]

definitely put it back the way it came off, but didnt try heater before removing pump. try your hose idea tommorow, thanx

 

[bennesspipers]

But whats that solenoidy clicking all about ?

 

[BlackC55]

Dont know.

is it the duo valve? If the cooling system is empty on the heater side the duo vale may have a funny five.

 

[bennesspipers]

Im wondering whether to remove one heater hose, hold it up in the air, & keep filling till the rad overflows, what you think ?

 

[BlackC55]

Yes do this with the engine off

 

[stevesey]

Yes do this with the engine off

Voice of experience?

 

[BlackC55]

Voice of experience?

No, just common sense!

 

[bennesspipers]

Yes, thanx, I agree with that

 

[bennesspipers]

Im pleased to announce that it was an air lock, taking the heater hose end off ,lifting it, filling it,squeezing pipes & refit has done the trick. Funny tho, all the air bubbles came up thro the rad, not up the heater pipe as id expected ! Job sorted anyway. Many thanks to BlackC55 for your input. John Worked on many different cars over the last 40 years, but this MB certainly has its mysteries !