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A6 v6 tdi 3.0 only blows cold air!!!!!!


TIDYDUBS
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Hello there......have not posted for what seems an eternity. Have a friends A6 2007 3.0 TDI with the twin controls for the climate control. Car blows cold all the time ......sporadically it will get a little hot only experienced this just now.

(00739)COOLANT CIRCULATION PUMP (V50) UPPER LIMIT REACHED.

Have checked pipework up to bulkhead still cold even the rear valves situated in the plenum chamber are stone cold and just the general heat there is non existant. Have not got underneath it yet as I'm off wok for a few weeks.........signed off so only got my basic diagnostic tool.VAGCOM is on a dead laptop.

Any ideas would be welcome..........cheers Tidy.

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  • 2 months later...
  • 8 months later...
All fixed.........there is a TPI for the said fix.......there is a pump in the plenum chamber underneath the 2 changeover valves......not cheap mind and a complete fecker to bleed without a vacuum fill kit.......mail me if you need to know more

would you mind posting some more info on how you fixed it?

I seem to have a similar problem with mine. It makes sounds like bubbles are escaping. Very weird and not to mention scary!

Any help welcome

Cheers!

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would you mind posting some more info on how you fixed it?

I seem to have a similar problem with mine. It makes sounds like bubbles are escaping. Very weird and not to mention scary!

Any help welcome

Cheers!

Hello there i have all the info but not with me at the moment but the pump in the plenum chamber with all the coolant pipes to and from it needs to be changed.....pretty much as I have described above.....vacuum filling the cooling system is the best way to complete the job without getting air locks, as i tried without it first and ended up with only the one side working in the cockpit once hot................

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  • 4 weeks later...
Hello there i have all the info but not with me at the moment but the pump in the plenum chamber with all the coolant pipes to and from it needs to be changed.....pretty much as I have described above.....vacuum filling the cooling system is the best way to complete the job without getting air locks, as i tried without it first and ended up with only the one side working in the cockpit once hot................

Hi there, you're problem is exact same as mine, and I'm pretty sure that I need to change that 'Heater Valve' too: item number 4F2 959 617 (A or B)? Just want to make sure that is the same item you are talking about! Also, if so, just a quick rundown on the method of 'vacuum filling': is it a diy job (with the right tools!).

Many thanks,

Garry

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