Heater blowing cold air only

[neilthechampion]

Hi all, haven't posted for a while as the skodas been going strong but...  Got an issue with the heating that I can't find the answer to either on here or Google. 

So my heater pretty much blows cold air all the time regardless of any settings /temperature selected,then all of a sudden it blows warm air for a few minutes then goes back to cold. 

The carpets are dry, thermostat changed and my mechanic cant find any leaks, 

I've reset the flaps, and done a code read which is below

 

2008 1.9 superb 

 

Any help will be greatly appreciated Many thanks 

[StevesTruck]

I believe the sensor is in the heater intake.

 

It's worth doing a HC "sniffer" test. I shouldn't think it is head gasket, but it's worth discounting before you go down a rabbit hole like I did with my Octavia. You can get a test kit on eBay/Amazon for under £20. 

[neilthechampion]

What's a HC sniffer test??? 

[Paws4Thot]

3 minutes ago, neilthechampion said:

What's a HC sniffer test??? 

Hydro-Carbon. In basic terms it's a test for an exhaust leak into the engine bay and hence ventilation system. That said, IME the mk1 human nose can detect exhaust gases being sucked into the ventilation system.

[neilthechampion]

2 minutes ago, Paws4Thot said:

Hydro-Carbon. In basic terms it's a test for an exhaust leak into the engine bay and hence ventilation system. That said, IME the mk1 human nose can detect exhaust gases being sucked into the ventilation system.

Definitely don't smell anything in the car