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solenoid valve control

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?

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14
steveastrouk says: Nov 10, 2012. 2:26 PM
No, you need something to pulse the solenoid - its either open or closed, and can't be partly open. That said, it needn't be hard to do, just a 555 timer.
stevelee10 (author) in reply to steveastroukNov 10, 2012. 3:11 PM
why cant it be partly open? on the hydraulic units at work we use proportional controls on the solenoids that dont use pulses.
14
steveastrouk in reply to stevelee10Nov 10, 2012. 3:40 PM
Because its not a 500 quid hydraulic proportional valve, its a cheap, (probably <10 quid) piloted on/off valve because that's all it needs.
stevelee10 (author) in reply to steveastroukNov 11, 2012. 2:43 AM
Ah ok. Ive got a load of 555.s knocking about ill have a bash
16
Lithium Rain says: Nov 10, 2012. 5:06 PM
Hmm, stevelee and steveastrouk, any relation? :D
stevelee10 (author) in reply to Lithium RainNov 11, 2012. 2:42 AM
Nope, no relation
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