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| Secure coolant hoses to heat exchanger with hose clamps -MP 7-602- (if the coolant hoses are not secured, then the coolant must be drained). |
Note If the heat exchanger is replaced, drain the entire coolant and fill system with fresh coolant. |
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| Place cleaning cloth below heat exchanger connection to collect drained coolant. |
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| Detach coolant hoses -2- and -3-. |
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| Carefully blow coolant out of the heat exchanger with compressed air. |
| To do so connect up the hose with compressed air on the connection fitting for the feed and attach the container under the connection fittings for return flow. |
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| Unscrew connection fitting for heat exchanger -1--arrow- and lay to the front. |
For vehicles with heating element for additional air heating (PTC) -Z35- |
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| Separate plug connection of the auxiliary heating to the vehicle wiring loom on left or heater unit. |
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| Unscrew the earth cable of the auxiliary heating under the bottom part of the air distributor housing. |
Continued for all vehicles |
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