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Collapsing radiator hoses (especially upper radiator hose ) may be an indication of a malfunctioning vacuum relief valve in the engine . Inspect and clean vacuum valve. Also make sure that overflow hose is open between overflow bottle and radiator .
The cooling system upper radiator hose should be replaced whenever they become cracked, swelled, deteriorated, or have a tendency to collapse.
Partially drain the cooling system to replace a cooling system upper upper radiator hose . Drain the cooling system completely to replace the radiator upper radiator hose .
NOTE: In some cases, prevailing compression spring clamps are used to attach the upper radiator hose and lower radiator hose to the radiator . The clamp for the lower radiator hose is the larger of the two. Do not switch the clamps on upper radiator hose and lower radiator hose .
- Drain or partially drain the cooling system by removing the radiator cap and attaching a 9.5mm (3/8-inch) inside diameter hose to the draincock nipple, located at the lower rear corner of the radiator . Then, open the radiator drain cock and allow the coolant to flow through the hose into a suitable container.
- Then, expand the clamps on each end of the hose(s) to be removed. Slide the hose(s) off the connections.
WARNING: DO NOT STAND IN LINE WITH OR NEAR THE ENGINE COOLING FAN BLADE WHEN THE ENGINE IS RUNNING.
- Position the clamps on each end of the new hose. Slide the hose onto the connectors. Make sure the clamps are located beyond the beads on the connectors.
- Fill the cooling system with a 50/50 mixture of coolant and water and bleed the system.
- Operate the engine for several minutes, then check the hose(s) and connections for leaks. Retighten screw clamps.
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