Electronics 2000

hi, im wanting to build somthing simple to control the heater control valve on my fiesta. its a simple solenoid valve at 0v its open(hot) at 12v(14.4v) its closed(cold) the propper control board uses pulses to control the valve, the board has since given up and im left with a very hot car, now i thought a simple way to sort the problem might be to use the 10k pot on the control board with a MOSFET and just vary the voltage going to the valve. will this have the same effect on the valve?

Hi,

The valve will be either open or closed - supplying an intermediate voltage won't give you a partially open valve. You'd need to feed pulses to the MOSFET or a relay in the same way as the control board. This could be done with a 555 timer in astable mode (with the pot varying the mark / space ratio), or with a microcontroller.