kermit_rr said:

Sounds like you've proven that the flaps aren't flapping

Click to expand...

dont really understand how it works but i guess i did lol

im thinking about adding valves to open / close during summer/winter to avoid having to remove the dashboad. adding valves to the existing factory setup is very hard but i was thinking about using the blanked off hoses originally used for the egr cooler. Any reason why that wont work? I see that i can use the feed from the oil cooler and add a shutoff valve there and then use the return to the expansion tank

something like this i think would work nicely:

The coolant always flows through the heater matrix, electrically operated flaps control how much air flows through them.
You don't need to take out the dash to remove/replace the motors (at least on the p38, i suspect the disco is similar)

i would need some guidance on what i can check however @sierrafery said that there is no way i can access motors or the flaps without total dash removal