Radiators Caps Bozeman MT

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Best Rate Repair and Towing
(406) 586-4357
2107 Lea Avenue, # B
Bozeman, MT
Services
AC and Heating Repair,Truck Parts

Carquest Auto Parts Store
(406) 587-4233
425 N 7th Ave
Bozeman, MT
Services
Auto Parts

Napa Auto Parts
(406) 587-9212
514 W Aspen St
Bozeman, MT
Services
Auto Parts, Car Washes, Car Detailing

Valley Truck and Equipment Repair
(406) 388-6176
151 Andrea Drive
Belgrade, MT
Services
Truck Parts

Auto Inn Garage
(406) 284-6869
114 E Main Street
Manhattan, MT
Services
Engine Repair,Truck Parts

Precision Automotive Repair
(406) 522-3911
115 Commercial Drive, # B
Bozeman, MT
Services
Brake Repair,Electrical Repair,Mufflers Repair,Truck Parts

Accurate Auto Repair
(406) 586-0619
621 E. Peach St.
Bozeman, MT
Services
Oil Change and Lube,AC and Heating Repair,Brake Repair,Cylinder and Block Repair,Emissions Testing,Mobile Auto Repair,Mufflers Repair,Truck Parts

Premier FX Inc
(406) 585-5577
430 Pronghorn Trail
Bozeman, MT
Services
Auto Glass Repair,Fabrication and Restoration,Truck Parts

Napa Auto Parts of Belgrade
(406) 388-4133
101 W Silverbow Ave
Belgrade, MT
Services
Auto Parts

O'Reilly Auto Parts
(406) 586-2378
103 W Mendenhall St
Bozeman, MT

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Radiators Caps Are Important Too

By Bill Siuru   

While radiator caps look simple and do not cost much, they are critical for a properly Operating cooling system. A faulty cap can result in overheating, loss of coolant or major engine damage, so it is important that it is checked periodically and replaced if necessary.

To prevent overheating and coolant loss, cooling systems are pressurized raising the coolant's boiling point about 3-degrees F for each additional psi above atmospheric pressure. The cooling system is pressurized as the engine warms up and the coolant expands. The radiator cap's pressure relief valve allows pressure to build up to a specified level, then lets excess pressure to escape. In an "open" systems found in older vehicles, excess pressure escapes to the atmosphere through an overflow tube. As the system cools, air enters through the overflow tube and coolant is lost. Therefore, "closed" or reservoir cooling systems are used in later model vehicles. Here, as the coolant expands it goes through the over- flow tube into a reservoir. The radiator cap now serves as a vacuum relief and siphon valve allowing coolant to be siphoned back into the radiator as the engine cools and the coolant contracts.

Radiator caps also serve as pressure relief valve to prevent excessive pressure in the cooling system after the engine is turned off. Unchecked high pressure could cause damage to the radiator, heater core, hoses or water pump seal. The pressure cap also prevents radiator hoses and tanks from collapsing due to the partial vacuum which would be created if air was unable to enter.

Check the radiator cap during routine maintenance, when coolant is tested or when coolant is replaced. Check only when the engine is cool. Then with the engine off, place a rag over the cap and remove it. Turn it counterclockwise about 1/4-turn until it reaches the safety stop. Allow all pressure to vent before removing the cap by pressing down and turning it counter-clockwise. On some vehicles, the radiator cap is located on the overflow reservoir.

Once the cap is removed, Pressure test the cap noting the maximum pressure when the cap valve opens. Caps come in a variety of pressure ranges: 4-pound caps (3-5 lbs.), 7- pound caps (6-8 lbs.), 13- or 14-pound caps (12-16 lbs.) and 15- or 16-pound caps (14-18 lbs.). The cap should be replaced if it fails to hold the rated pressure for one minute. Using a cap with the wrong pressure rating can cause over pressurization or...

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