The 1991 Chevy truck requires a mixture of ethylene glycol-based antifreeze and water.
The exact ratio of antifreeze to water will vary depending on the climate in which the truck is operated.
In general, a 50/50 mix of antifreeze and water is recommended.
However, in colder climates, a higher concentration of antifreeze may be necessary to prevent the coolant from freezing.
Antifreeze
The antifreeze used in a 1991 Chevy truck should be specifically formulated for automotive use.
It should also contain corrosion inhibitors to protect the metal components of the cooling system.
Some common types of antifreeze that can be used in a 1991 Chevy truck include:
* Dex-Cool
* Prestone
* Peak
Water
The water used in a 1991 Chevy truck should be distilled water.
Distilled water does not contain minerals or other impurities that can damage the cooling system.
If distilled water is not available, filtered water can be used as a substitute.
Mixing Antifreeze and Water
When mixing antifreeze and water, it is important to follow the directions on the antifreeze container.
In general, the antifreeze should be added to the water slowly, while the mixture is being stirred.
This will help to ensure that the antifreeze is evenly distributed throughout the mixture.
Replacing Coolant
The coolant in a 1991 Chevy truck should be replaced every 2 years or 30,000 miles, whichever comes first.
To replace the coolant, follow these steps:
1. Drain the old coolant from the radiator and engine block.
2. Flush the cooling system with water.
3. Add the new coolant mixture to the radiator and engine block.
4. Run the engine for a few minutes to circulate the coolant throughout the system.
5. Check the coolant level and add more mixture as needed.
By following these steps, you can help to keep your 1991 Chevy truck's cooling system in good working order.
