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

A/C Constant Run Relay


This relay, used on vehicles equipped with V6-231 engine, is controlled by the electronic control module to maintain a constant engine idle speed. When the engine is idling, the electronic control module energizes the relay through an electronic switch to ground, bypassing the pressure cycling switch for a three minute time period.