2015 Audi A3 Quattro, no heat diagnosis and repair

[@motivation-eh1kb]

I have the same problem with my audi a3 I changed the heater motor it wasn't the problem. When I put on low heat it works when I put it to the maximum it starts blowing cold air.

[@bulldogsautomotiveadventur4387]

@@motivation-eh1kb that sounds more like the core plugged up, low flow through the core will still produce heat but with the fan on high it blows it away and can’t keep up, if you’ve already checked that valve to make sure it’s flowing I would flush the core to see if that does it.

[@motivation-eh1kb]

@bulldogsautomotiveadventur4387 not yet I haven't checked the valve.

[@dalethornton1113]

Part number? Part name?

[@bulldogsautomotiveadventur4387]

@@dalethornton1113 heater shut off valve, pn# 4H0121671D