Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1999ASTRO VAN 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDESCRIPTION AND OPERATIONAFTERMARKET (ADD-ON) ELECTRICAL AND VACUUM EQUIPMENT
1999 Chevrolet Astro Van 2WD V6-4.3L VIN W
Aftermarket (Add-On) Electrical and Vacuum Equipment
1999 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION Aftermarket (Add-On) Electrical and Vacuum Equipment
Aftermarket (add-on) electrical and vacuum equipment is any device installed on to a vehicle after the vehicle has left the factory that connects to the electrical circuits or vacuum hoses of the vehicle.
NOTE:
^ Do not attach add-on vacuum operated equipment to this vehicle. The use of add-on vacuum equipment may result in damage to vehicle components or systems.
^ Connect any add-on electrically operated equipment to the vehicle's electrical system at the battery (power and ground) in order to prevent damage to the vehicle.
Add-on electrical equipment installed as instructed can cause the system to malfunction.
Add-on electrical equipment not connected to the vehicle electrical circuits can cause the system to malfunction. Examples of these types of equipment include the following:
^ Portable telephones
^ Portable radios
Disconnect all add-on equipment in order to diagnose a malfunction.
NOTE:
^ Do not attach add-on vacuum operated equipment to this vehicle. The use of add-on vacuum equipment may result in damage to vehicle components or systems.
^ Connect any add-on electrically operated equipment to the vehicle's electrical system at the battery (power and ground) in order to prevent damage to the vehicle.
Add-on electrical equipment installed as instructed can cause the system to malfunction.
Add-on electrical equipment not connected to the vehicle electrical circuits can cause the system to malfunction. Examples of these types of equipment include the following:
^ Portable telephones
^ Portable radios
Disconnect all add-on equipment in order to diagnose a malfunction.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.