the heater/air con controls on my 1997 peugeot 406 sri turbo only works on full power?

Question

i have tried a new control unit but still have the problem

Answer 1

Not sure about this specific car, but many cars use a ballast resistor to reduce the power to the switch (so the switch doesn't burn out too fast). The lower settings are usually on a different circuit from the full power setting. Hope this helps - and good luck!