The W123 has an auxiliary coolant pump that circulates the coolant through the heater, head and block after the vehicle has been shut off. This pump insures that there will be no hot spots in the head caused by hot coolant siting stationary. Hot spots like these can lead to a head gasket failure, so if your pump stops working make sure to replace it right away.
A couple of safety precautions/instructions you may want to observe before beginning:
Allow cooling system to cool down to a coolant temperature of less than 90 degrees C. Open the cap of cooling system slowly; turn a conventional coolant cap as far as the first detent and turn a screwed coolant cap approx. 1/2 turn and release the pressure. Wear protective gloves, protective clothing and eye protection. Always dispose of used coolant in accordance with the regulations in your region; NEVER pour coolant down a drain, into the ground or a sewer.
Remember your car may have been serviced before and parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.
Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.
Our vehicle may vary slightly from yours as models do change and evolve as they grow older. If something seems different, let us know and share your info to help other users.
Read the Full Article:
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Time: 2 hours
Tab: $90 to $560
Tools:
Flathead screwdriver - [ Ссылка ]
Large bucket -
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Applicable Models:
Mercedes-Benz W123 (1977-85) - [ Ссылка ]
Parts Required:
Auxiliary pump - [ Ссылка ]
Coolant -[ Ссылка ]
Hot Tip: Get a really big bucket
Performance Gain: Proper cooling
Complementary Modification:
Coolant flush - [ Ссылка ]
