Check low-temperature circuit cooling system for leaks - AR09.41-P-1010CD
MODEL 172 with ENGINE 274
MODIFICATION NOTES
| 26.9.14 | Mixing ratio, coolant | BF20.00-P-1001-04A |
| Risk of injury to skin and eyes suffering scalding from contact with hot coolant spray. Risk of poisoning from swallowing coolant. | Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses. |
AS20.00-Z-0001-01A | |
| Notes on coolant | AH20.00-N-2080-01A | ||
| Remove | |||
| 1 | Remove upper engine cover | ||
| Check | |||
| 2 | Check coolant level and antifreeze content coolant in low-temperature circuit | In a case of the antifreeze content of the coolant being too low: ↓ Add antifreeze or replace the coolant. |
*BF20.00-P-1001-04A |
| 3 | Unscrew tester cap (3) at low-temperature circuit coolant expansion reservoir (2) | Fig 3 | |
| 4 | Connect pressure pump (4) at tester cap (3) | Fig 2 | |
| 5 | Apply compressed air to low-temperature circuit for 2 minutes at the test pressure | Do not exceed the specified test pressure. Damage can occur on the engine cooling system otherwise. |
|
| Test pressure for pressure-testing the engine cooling system In the event of pressure loss: ↓ Perform a visual inspection on the components carrying coolant. |
*BE20.30-P-1005-01A | ||
| 6 | Actuate pressure relief button on pressure pump (4) and relieve the pressure | Fig 2 | |
| Install | |||
| 7 | Unscrew tester cap (3) at low-temperature circuit coolant expansion reservoir (2) | Fig 3 | |
| 8 | Check coolant level and antifreeze content of coolant and correct if necessary | *BF20.00-P-1001-04A | |
| 9 | Screw cap (2) onto low-temperature circuit coolant expansion reservoir (1) | ||
| 10 | Install engine cover |
RADIATOR OR EXPANSION RESERVOIR CAP
| Number | Designation | 1-stage cover latch | 2-stage cover latch | ||
|---|---|---|---|---|---|
| BE20.30-P-1005-01A | Test pressure for pressure-testing the engine cooling system | Overpressure | bar | 1, 4 | 1, 4 |
COOLANT MIXING RATIO
| Number | Designation | ENGINE ALL | ||
|---|---|---|---|---|
| BF20.00-P-1001-04A | Coolant mixing ratio | Antifreeze/water | up to -37°C | 50/50 |
| Antifreeze/water | up to -45°C | 55/45 | ||
| Specification | Coolant (Specification 310.1). See https://bevo.mercedes-benz.com/index.php?language_id=1 | |||