1975-79 Nova Radiator Overflow Jar

Correct reproduction of radiator overflow jar for fitment on 1975-79 Nova and all GM X-Body models. Utilizing correct blowform method, each jar is manufactured in correct clear plastic material and features correct lettering with fluid level markings as original. Includes mounting clips and screws.

Note: Jar cap available separately, please see below.

The 1975-1979 Chevrolet Nova, like many other vehicles of its era, was equipped with a radiator overflow jar, also known as a coolant overflow reservoir or recovery tank. The purpose of the radiator overflow jar was to help manage excess coolant in the cooling system, especially when the engine was hot and the coolant expanded. Here are some details about the 1975-1979 Nova radiator overflow jar:

Function: The radiator overflow jar served as a supplementary coolant reservoir. It was connected to the vehicle's radiator through a hose. When the engine was running and the coolant heated up, any excess coolant that expanded beyond the capacity of the radiator would flow into the overflow jar. Conversely, when the engine cooled down, the vacuum created would draw coolant back from the jar into the radiator.

Material: Radiator overflow jars were typically made of clear or translucent plastic, which allowed for easy visibility of the coolant level. This transparency allowed drivers and mechanics to monitor the coolant level without opening the radiator cap.

Mounting Location: The overflow jar was usually mounted in the engine compartment, often secured to the inner fender or firewall for easy access. Its placement allowed for efficient coolant management and monitoring.

Hose Connection: A hose connected the radiator to the overflow jar. This hose allowed for the transfer of coolant between the two components. When the engine was hot and the coolant expanded, it would flow into the jar. When the engine cooled down, the vacuum created would draw coolant back into the radiator.

Maintenance: Regular maintenance of the radiator overflow jar involved checking the coolant level, ensuring that the hose connections were secure, and verifying that the jar was free from cracks or damage. Any signs of coolant leaks or damage to the jar would require replacement.

Importance: The radiator overflow jar was an important component in preventing coolant loss due to overheating and ensuring that the cooling system remained at the proper operating level. It also helped reduce environmental impacts by minimizing coolant spillage.

Replacement: If the radiator overflow jar became cracked, damaged, or worn out, it was crucial to replace it to maintain the proper function of the cooling system and prevent coolant loss.

Fitment: Nova: 1975, 1976, 1977, 1978, 1979

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1975-79 Nova Radiator Overflow Jar

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Fitment: Nova: 1975, 1976, 1977, 1978, 1979