Audi A6 C5 2.7 biturbo

Peacedub · 22-01-19, 12:46 PM

Hey all,

Sorry but I didn't know which category to put it into so I've placed it here first.

I've recently purchased the titled vehicle and all is good in the world

Its not so much of a problem but the heaters blow cold when at idle and warm up again when the revs pick up then cold on low etc, its more annoying than anything especially in these cold mornings. I've done a full coolant flush and replaced as I usually do with new cars. Its just had in the last 12 months a cambelt with water pump etc. Is this an issue with the matrix/heater flaps?

Thanks in advance

Mellis46 · 22-01-19, 12:51 PM

Thermostat?

V6Rob · 22-01-19, 02:09 PM

not sure if it's the same as the 2.6 but is there an air bleed screw in one of the rubber pipes just before they go through the bulkhead?

Peacedub · 22-01-19, 03:20 PM

Quote:

Originally Posted by Mellis46

Thermostat?

Yeah this was my first thought, it gets up to temp pretty quick, stuck open? it was a mission to do the coolant swap (bumper off job), is the thermostat a bastard on these engines? I'm more used to cars with loads of space under the bonnet. These are literally shoe horned in!

Quote:

Originally Posted by V6Rob

not sure if it's the same as the 2.6 but is there an air bleed screw in one of the rubber pipes just before they go through the bulkhead?

Not sure, I too have a 2.6 v6 avant as well so will compare.

Mellis46 · 22-01-19, 09:19 PM

Quote:

Originally Posted by Peacedub

Yeah this was my first thought, it gets up to temp pretty quick, stuck open? it was a mission to do the coolant swap (bumper off job), is the thermostat a bastard on these engines? I'm more used to cars with loads of space under the bonnet. These are literally shoe horned in!

There isn’t a lot of room no! It’s been a while but I remember us getting one in and it being part of the timing belt / water pump service, it’s next to the water pump itself. Sure someone who knows better will correct me if I am wrong!

If the engine itself comes up to temp but the heater doesn’t it probably isn’t the stat tbh, more like air in the system or duff heater matrix...

Sandro · 22-01-19, 09:48 PM

Yes, the thermostat is the water pump / timing belt job on these. In the middle at the front of the engine block.
The quickest way is to remove bumper, front panel with rads on one side (so You don't need to disconnect aircon rad) and it's a pretty simple job. Just timing tool for camshafts recommended.

If the engine gets up to ~90C them it will be air in the pipes or matrix. I would bet on air

22-01-19, 12:51 PM	#2
Mellis46 Aero Advocate Classic Audi Club Member Join Date: Aug 2014 Location: Lancashire Posts: 1,448	Thermostat? __________________ -1987 90 2.2E / Sapphire Blue (Rest in Pieces) -1989 90 quattro with Sport Equipment / Satin Black -1997 A4 Avant quattro TDI 110 / Tropical Green (Sold)

22-01-19, 02:09 PM	#3
V6Rob Grown up member Join Date: Oct 2015 Posts: 172	not sure if it's the same as the 2.6 but is there an air bleed screw in one of the rubber pipes just before they go through the bulkhead?

22-01-19, 09:48 PM	#6
Sandro Grown up member Join Date: Feb 2011 Location: Chelmsford Posts: 651	Yes, the thermostat is the water pump / timing belt job on these. In the middle at the front of the engine block. The quickest way is to remove bumper, front panel with rads on one side (so You don't need to disconnect aircon rad) and it's a pretty simple job. Just timing tool for camshafts recommended. If the engine gets up to ~90C them it will be air in the pipes or matrix. I would bet on air