Check Engine Cooling System For Leaktightness - AR20.00-P-1011MNI
Engine 177 in model 290
Shown on model 290.688
| 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 overpressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses. |
AS20.00-Z-0001-01A | |
| Notice | Notes on coolant | AH20.00-P-2080-01KOA | |
| Notes on coolant level | AH20.00-P-1142-01CW | ||
| Remove | |||
| 1 | Switch on ignition. | ||
| 2 | Adjust heater to maximum heat output. | ||
| 3 | Remove front and center lower engine compartment paneling. | AR61.20-P-1105FRX | |
| 4 | Remove upper engine cover. | ||
| 5 | Remove cap (1). | ||
| Check | |||
| 6 | Check coolant level and correct. | *BF20.00-P-1001-04A | |
| *BF20.00-P-1001-02LA | |||
| 7 | Attach tester cap (3) to coolant expansion reservoir (2). | Fig 1 | |
| 8 | Connect pressure pump (4) at tester cap | Fig 2 | |
| 9 | Apply a test pressure to the engine cooling system for 2 minutes. | Do not exceed the specified test pressure. Otherwise the engine cooling system will be damaged. |
|
Test pressure for pressure-testing the cooling system |
*BE20.30-P-1002-01D | ||
| 10 | Check condition of all coolant carrying component parts and connections and check for leak tightness. | Only in case of pressure loss. If complaints are present, ↓ Replace corresponding components. |
|
| 11 | Relieve test pressure via valve on pressure pump (4). | Fig 2 | |
| 12 | Remove pressure pump (4) from tester cap (3). | Fig 2 | |
| 13 | Remove tester cap (3). | Fig 1 | |
| 14 | Check coolant level and correct. | *BF20.00-P-1001-04A | |
| *BF20.00-P-1001-02LA | |||
| Install | |||
| 15 | Attach the cap (1). | ||
| 16 | Install upper engine cover. | ||
| 17 | Install the front and lower center engine compartment lining. | AR61.20-P-1105FRX | |
| 18 | Switch off ignition. |
COOLING SYSTEM CHECK VALUES
| Number | Designation | Engine 177 | ||
|---|---|---|---|---|
| BE20.30-P-1002-01D | Test pressure for pressure-testing the cooling system | Overpressure | bar | 1, 4 |
COOLING SYSTEM
| Number | Designation | Engine 177 in model 290 except code ME10 (Hybrid vehicle (plug-in, PHEV)) | Engine 177 in model 290 with code ME10 (Hybrid vehicle (plug-in, PHEV)) | |||
|---|---|---|---|---|---|---|
| BF20.00-P-1001-02LA | Cooling system | Workshop replacement amount | Main circuit | Liter | ≈15, 3 | ≈14, 3 |
| Low Temp circuit 1 | Liter | ≈6, 4 | ≈10, 7 | |||
| Low Temp circuit 2 | Liter | - | ≈5, 6 | |||
| Antifreeze/water | Down to -37°C | % | 50/50 | 50/50 | ||
| -38°C and below | % | 55/45 | 55/45 | |||
| Fluids specification | BB00.40-P-0310-01A | BB00.40-P-0310-01A | ||||
| Fluids specification | BB00.40-P-0325-06A | BB00.40-P-0325-06A | ||||
| Fluids specification | BB00.40-P-0326-06A | BB00.40-P-0326-06A | ||||
COOLANT MIXING RATIO
| Number | Designation | All engines, except engine 178 in model 190.381 | |||
|---|---|---|---|---|---|
| BF20.00-P-1001-04A | Coolant mixing ratio | Antifreeze/water | Up to -25°C | % | - |
| Up to -37°C | % | 50/50 | |||
| As of -38°C | % | 55/45 | |||
| Overview and specifications sheet | BB00.40-P-0310-01A | ||||
| References to sheet specification | BB00.40-P-0310ZZ | ||||