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)

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Service Tips

Service Tip:





- If the A/C is on during the diagnostic trouble code check, Diagnostic Trouble Code No. 525 or 539 is output.
- If the circuit is open, wide open throttle A/C cutout will not occur.
- If the circuit is shorted, the A/C will not operate.