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Guest 4123
Guest
If you switch off the A/C controller, the blower will not run. So removing fuse 38 will also stop the blower.
RAB
RAB
Not sure if Fuse 38 supplies the Climatronic Controller as well as the AC, don't have a cct diagram. The Climatronic Controller does more than just control the AC, so may be fused independently.If you switch off the A/C controller, the blower will not run. So removing fuse 38 will also stop the blower.
RAB
Was that with a hot or cold engine? Don't forget that you have two sources of heat, the electric heater and the normal heat exchanger. The former will supply heat at start-up (but not with ECON on) and the latter will take over when the engine heats up. However, with AUTO selected, if the heat exchanger does not heat up, the blower will run slowly.When pushing ECON mode today, the air came back instantly. Heat as well.
These circuits are usually (or should be) designed to fail safe. So A/C would be off with such a failure.The AC is controlled by means of regulating valve N280, which is continuously variable via PWM (Pulse Width Modulation), so, not just open or closed. The HVAC (Climatronic) Controller controls the N280 valve. So, if it fails open, AC is on, and uncontrolled.
RAB, I was thinking of a mechanical failure of the N280 valve, so the control circuits would think it was (nearly) closed when it wasn't. But, you're probably right, something somewhere would spot an anomaly, and flag an error code.These circuits are usually (or should be) designed to fail safe. So A/C would be off with such a failure.
RAB
Don't forget that the A/C switches off at something like 5 to 7deg C to prevent icing. ECON also switches off A/C, as well as the electric heater. There are other factors that switch off the electric heater, such as the load on the alternator.Good stuff, I'm thinking that the the " necessary air throughput" that the the partially open flap allows, is necessary because their is always a flow, (albeit >2%), of refrigerant through the evap. If there was no flow the evap would get very cold indeed, and, probably ice up. This is independent of ECON or AC mode (no AC compressor clutch, just the N280).
RAB,Don't forget that the A/C switches off at something like 5 to 7deg C to prevent icing. ECON also switches off A/C, as well as the electric heater. There are other factors that switch off the electric heater, such as the load on the alternator.
RAB