After 3 years of ownership, its only come to light, my son assumed it was normal so didnt mention it. When starting car from cold, no heat comes out of the heater until its well on the way to normal operating temperature, which takes about 10 mins in winter, when suddenly its starts to feed through.

The 1.2tsi has a dual coolant circuit with an electrically operated diverter valve in the water pump. The idea is to speed engine heatup, the cabin heater is excluded until normal operating temperature is reached but only when there is no heater demand, presumably by monitoring the cabin controls.

Question, is this function programmable, either by maxidot or vcds?

My Leon doesn't pump out heat till the car is warm, and its nearly 10 years old (except obviously if you put the front demister on).

 

10 minutes seems a long time to get warm, both my ancient Leon, and brand new diesel (so slower to heat up) Octavia will be pumping out heat well before 5 minutes.

 

What country are you from? Somewhere massively colder than the UK?

The SSP below describes how the Audi 1.2TFSI engine cooling system works. Reading it, I would say that your son's car definitely has a problem since cabin heating should start becoming available shortly after starting.

http://www.yetiownersclub.co.uk/forum/uploads/467/Audi_Self_Study_Programme_485_-_1.2l_TFSI_engine.pdf

I am not clever enough to work out which component or components are not working as they should. Has the car had any work done on its cooling system and, if so, was the system vented using the test equipment mentioned at the top of page 22?

Sorry, this should have been posted in mk2 section...

 

No work has been done on the car apart from routine dealer service. Unfortunately I hardly have access to the car, except when it requires servicing once a year and dad's credit card is needed.... 

Depending on how cold it is, I don't think 10 mins is unreasonable. My Pulsar takes 5 mins or so to start putting out heat, and its quite mild here in Adelaide.

Back in northern Minnesota, it could easily take 10 mins or more to warm a car up on a cold winter morning, sometimes it would be so cold that the engine would never get warm.

Watch the temp gauge. Does the heat start shortly after the needle lifts above C? Or is the needle into the middle of the gauge for a few mins before heat comes?

Sorry for the delay in replying.

The day I had it, the needle reached about 80 deg C, i.e. not far from centre, I then tweaked the the heater control from max heat to cold back to max hot, before heat slowly started coming out. Incidently the idle speed also rose from its warm approx 800rpm to approx 1050rpm at this time which made me think the pump had switched mode.

It was a one off, so I wasnt scientific, but my son says its what always happens. Next time I get my hands on it, I'll be a little more scientific in technique and measurement of time etc.

The SSP below describes how the Audi 1.2TFSI engine cooling system works. Reading it, I would say that your son's car definitely has a problem since cabin heating should start becoming available shortly after starting.

http://www.yetiownersclub.co.uk/forum/uploads/467/Audi_Self_Study_Programme_485_-_1.2l_TFSI_engine.pdf

I am not clever enough to work out which component or components are not working as they should. Has the car had any work done on its cooling system and, if so, was the system vented using the test equipment mentioned at the top of page 22?

 

 

Hi,

the document behind the link above is extremely interesting reading (not only for understanding the heating/cooling). Is there something similar available for the new generation 1,2 TSI with 4 valve head?

I did a search but could not find anything...might be my fault

Sorry but I can't find any similar document for the newer engine.