Mistra Overheating Check Engine Light

Indeed, an active air flap fault could certainly explain those symptoms. The flap's primary function is to regulate air intake, and if it's malfunctioning, it can lead to both a check engine light and overheating. Have you had a diagnostic scan performed to confirm the fault code related to the air flap motor? What were the exact error codes?

Thanks! I haven't done a scan myself. I was hoping to avoid the expense if it was something simple. But if it's the flap motor, how complicated is that to fix? Are we talking a simple replacement or a whole air intake overhaul? Is this something I can even attempt on my own?

While a DIY repair is theoretically possible, given the potential for complications and the need for specialized tools, I would strongly advise against attempting it yourself. It is akin to performing surgery on yourself when a trained surgeon is available. The error code points to a defective electromechanism. I recommend taking it to a qualified workshop. They can properly diagnose the issue and replace the faulty component. Neglecting it could lead to further engine damage.

Okay, thanks for the advice. I figured it was probably beyond my skillset. I took it to the shop, and you were right – the active air flap electromechanism was shot. Cost me 590€ to get it fixed, but at least the engine's running cool again and the check engine light is gone. Lesson learned!