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What degree of thermostatic should use in a 1999 mercury grand marquis with v8 engine?

There isn't a specific "thermostat degree" universally recommended for a 1999 Mercury Grand Marquis with a V8. The correct thermostat temperature is determined by the factory specifications for that particular vehicle and engine.

To find the correct thermostat temperature:

1. Check your owner's manual: This is the best place to start. The manual should specify the correct thermostat temperature for your specific engine.

2. Consult a repair manual: A repair manual specific to your 1999 Mercury Grand Marquis (Haynes or Chilton manuals are popular options) will list the specifications, including the thermostat temperature.

3. Look up the thermostat online: You can search online using the year, make, model, and engine size (e.g., "1999 Mercury Grand Marquis 4.6L thermostat temperature"). However, always verify this information with a reputable source like a repair manual or parts store website that cross-references your vehicle's VIN.

Using the wrong thermostat temperature can lead to overheating or poor engine performance. Therefore, it's crucial to use the manufacturer's recommended temperature. Don't guess – find the correct specification using the resources mentioned above.