Step | Action | Yes | No | ||||||||||||
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DEFINITION: Noise originating from the blower motor and/or the air delivery system. No loss of battery or ground is occurring in the blower motor circuit. The blower motor resistor and the blower motor are not exhibiting any intermittent internal shorts. For electrical diagnosis of the blower motor circuit, refer to Symptoms - HVAC Systems - Manual in HVAC Systems - Manual or Symptoms - HVAC Systems - Automatic in HVAC Systems - Automatic. | |||||||||||||||
1 | Did you review the HVAC Description and Operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - HVAC Systems - Manual in HVAC Systems - Manual or Symptoms - HVAC Systems - Automatic in HVAC Systems - Automatic | ||||||||||||
2 |
Is a scrape or pop noise evident when selecting modes or temperature settings (moving a mode or temperature valve)? | Go to Step 12 | Go to Step 3 | ||||||||||||
3 | Is a tick/click, chirping, groaning or scraping noise present -- constantly but decreases as blower motor speed is decreased, or only at start-up/intermttent -- in all modes? | Go to Step 6 | Go to Step 4 | ||||||||||||
4 | Is an air rush/whistle noise evident in all modes but not all temperature settings? | Go to Step 13 | Go to Step 5 | ||||||||||||
5 | Is an air rush/whistle noise evident only in defrost or lower mode? | Go to Step 14 | Go to Step 15 | ||||||||||||
6 | Check for blower motor and impeller assembly excessive vibration at each blower motor speed by feeling the blower case. Is excessive vibration present? | Go to Step 7 | Go to Step 9 | ||||||||||||
7 |
Does the blower motor impeller exhibit any of these abnormal conditions? | Go to Step 8 | Go to Step 9 | ||||||||||||
8 |
Is the action complete? | Go to Step 16 | -- | ||||||||||||
9 |
Was foreign material found? | Go to Step 11 | Go to Step 10 | ||||||||||||
10 |
Is the repair complete? | Go to Step 17 | -- | ||||||||||||
11 |
Is the action complete? | Go to Step 17 | -- | ||||||||||||
12 |
Is the action complete? | Go to Step 17 | -- | ||||||||||||
13 |
Is the action complete? | Go to Step 17 | -- | ||||||||||||
14 |
Is the action complete? | Go to Step 17 | -- | ||||||||||||
15 |
Is the action complete? | Go to Step 17 | -- | ||||||||||||
16 |
Is the noise still present? | Go to Step 10 | Go to Symptoms - HVAC Systems - Manual in HVAC Systems - Manual or Symptoms - HVAC Systems - Automatic in HVAC Systems - Automatic | ||||||||||||
17 |
Is the noise still present? | Go to Step 2 | Go to Symptoms - HVAC Systems - Manual in HVAC Systems - Manual or Symptoms - HVAC Systems - Automatic in HVAC Systems - Automatic |