What is indicated if more than a few droplets of water are noticed when the supply reservoir is drained?
- The alcohol reservoir needs to be topped up
- The weather is extremely humid
- The air dryer or compressor may require servicing ✓
- The supply reservoir is functioning properly
Answer: C. The air dryer or compressor may require servicing
More than a few droplets of water in the drained supply reservoir means the air dryer or compressor may need servicing.
Why this is the answer
The handbook says that if you see more than a few drops of water when you drain the supply reservoir, the air dryer or compressor may need servicing. Air dryers are meant to pull water vapor, oil mist and carbon particles out of the air before it reaches the first reservoir, so water showing up in the reservoir points to a problem with that drying job. The manual goes on to say to check the air dryer's operation by looking for water in the reservoirs during your periodic checks.
Why the other answers are wrong
- A. The alcohol reservoir needs to be topped up — The passages never tie water in the supply reservoir to the alcohol reservoir or say anything about topping it up.
- B. The weather is extremely humid — Humidity is not given as the cause; the passages point to the air dryer or compressor needing service, not the weather.
- D. The supply reservoir is functioning properly — Finding more than a few drops is a sign something needs servicing, so it is not evidence the supply reservoir is working as it should.
Remember it
Remember it as water in the tank means work for the dryer: if draining gives you more than a few drops, think service, not normal.