Radiators Caps Great Falls MT

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Electric City Brake & Alignment
(406) 761-2852
500 8th Avenue South
Great Falls, MT
Services
Brakes Service & Repair, Auto Parts Retail, Tractor Equipment & Parts Dealers, Plumbing Service & Repair, Auto Alignment Frames & Axles Service & Repair
Hours
Mon-Fri Weekdays
Products
alignment, Commercial Industrial, Parts Available, Electric Brake Controllers,

Napa Auto Parts of Great Falls
(406) 452-9567
326 Central Ave W
Great Falls, MT
Services
Auto Parts

Carquest Auto Parts Store
(406) 452-8555
2305 11th Ave S
Great Falls, MT
Services
Auto Parts

Rocky Mountain Truck Service
(406) 452-8561
5808 2nd Avenue North
Great Falls, MT
Services
Truck Parts

Novco
(406) 761-0000
711 10th Avenue South
Great Falls, MT
 
Motor Power Great Falls
(406) 727-3055
4732 Tri Hill Frontage Road
Great Falls, MT
Services
Truck Parts

Carquest Auto Parts Store
(406) 453-6557
520 1st Ave S
Great Falls, MT
Services
Auto Parts

Tractor and Equipment CO
(406) 761-7900
4001 River Drive North
Great Falls, MT
Services
Truck Parts

Napa Auto Parts of Great Falls
(406) 453-6517
1515 10th Ave S
Great Falls, MT
Services
Auto Parts

O'Reilly Auto Parts
(406) 454-1345
1301 3rd St Nw
Great Falls, 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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