Originally Posted by
zzsteve
Hi Keithy,
Yep, been there done that. Resoldered the fusebox and have good supply to both blowers. It's just missing the drive signal to the relay on the LH blower unit. I suspect if the HEVAC detects a short or open circuit and then takes that motor offline until the error is cleared.
Prelude,
Thinking Teensy
Teensy USB Development Board (because I have some) and it has up to 12 PWM outputs for servos. This should allow me to put conventional hobby servos in place of the blend motors. Even three high torque metal geared servos are cheaper than one blend motor. Have ordered a couple of PWM controllers (12V, 20A) for the blowers. To keep it simple, I'll emulate a Holden Commodore - rotary switch for fan speed, ignore solar and ambient temperature input. Just drive the A/C request line to ECM and the compressor relay signal while checking evap. temperature to prevent icing-up. Could get fancy with some PID algorithm, but just blowing some cold air would be a significant milestone currently. The more I dissect this thing, the more I see it suffering from over-engineering. As everything in the system ages, the faults just compound each other.
First tasks are to install servos on cable actuators to the heater box while it is on the carport floor and make up a panel to replace the HEVAC.
Stay tuned...
Cheers and thanks
Steve
I see a growth industry developing here!!!! Might even pay for your retirement in due course.
MY16 D4 TDV6 - with a little Cambo magic for towing "The Brick"
MY95 RRC LSE Vogue Softdash "Bessie" (turning circle comparable to QE II) with MY99 TD5 and 4HP24 transplants. Back home Nov 22 after a magic overhaul by Chivalry
SADLY SOLD MY04 D2a TD5 auto Classic and MY10 D4 2.7 both with lots of goodies
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