Hi all, hoping someone can help me!

I have a 2006 Audi A6 Avant with the dual climate control. Problem is, it is intermittently blowing cold when the heating is set to high. If I am driving at a steady pace, like on the motorway - the heating will start working, but slow moving or around town - nothing but cold air coming through.

I did a VAGCOM check, and it's giving me the following message which I believe it may be related to:

00739 - Coolant Circulation Pump (V50)
001 - Upper Limit Exceeded - Intermittent

Tried googling this, but can find nothing specific at all, and really don't want to take it to a dealer (Irish Audi dealers are probably the best paid in the world!!).

Cheers all,

Garry

 

OK make sure your engine temp gauge is right up the middle where it is supposed to be and the engine is not over heating or cooling.

if it is not where it is supposed to be - Thermostat

What does your ambient temp say for outside is it wrong?-front ambient temp sensor could be bad or broken wire

you should have 2 cooling sensors, Your model is newer than mine I have 2 in my 02 one of mine is in front of the radiator the other is in my vent. they tell the climate control what temp is outside and what temps in the vent

My front sensor failed and that's what it did, flipped back and forth from a/c to heat.

Try disconnecting the front sensor and run like that see if it helps
it will defer to the inside temp sensor. disconnect it with the car off then restart.