Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Heater Blower Switch Test

1. Remove heater control, refer to A/C Heater Control Removal.

Heater Blower Switch Test:




2. Use a ohmmeter, and check continuity between the terminals of the switch as shown in the Heater Blower Test.
3. If switch fails any part of the continuity test, other then Pin 1 to Pin 7, replace heater control. If no continuity between Pin 1 to Pin 7 check the lamps, replace if necessary.