You're asking for information about a "HAIER AC 8888 / 30 AIR CONDITIONER" service manual, but the information provided is misleading and likely incorrect. There is no vehicle, car, truck, or SUV produced by Haier. Haier is a Chinese multinational company primarily known for manufacturing home appliances, including refrigerators, washing machines, air conditioners, and televisions.

The product you're referring to is most likely a specific model of Haier air conditioner, not a vehicle. The model number "AC 8888 / 30" is likely a combination of the model designation and cooling capacity. Service manuals for Haier air conditioners are usually available online through their website or authorized service centers, and they are designed to assist technicians in diagnosing and repairing common issues with the appliance. Therefore, the description provided is incorrect, and there is no "vehicle" or "secrets" involved.