Hello Mercedes friends, coolers and thermostats are new. This as an introduction 😉 Unfortunately the interior heat problem still exists. Heating stands on “cold”, but from the vents in front of the windscreen and from the 2 side nozzles still comes very warm air. If I turn the blower up, it is as if a hot Sahara wind blows into the interior. The company that changed the cooler thought it could be the heat exchanger. Is it still a new part ? Do you really have to remove the dashboard / center console for replacement or removal? Who has had a comparable repair or made it yourself? Or is the assumption “heat exchanger” simply wrong and the problem lies elsewhere? Do not actually have to “disassemble” the interior. Thank you for your answers. Greetings Kurt Mercedes 420 SL without air conditioning, BJ 2/1986