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The temperature regulator valve (see rice. The air filter) operates the gate. At the faulty valve there can be interruptions in operation of the engine idling in the warming up mode, interruption at increase in frequency of rotation, the engine develops insufficient power, fuel consumption increases. The valve is checked on the cold engine. The gate has to turn easily, without jammings. On the warm engine depending on ambient temperature access of warm air has to be blocked partially or completely.
| PERFORMANCE ORDER |
| 1. To remove the filter, without disconnecting hoses (5) and (17). |
| 2. To start the engine and to leave to idle. |
| 3. To disconnect a hose from the valve. The gate has to block supply of warm air. |
| 4. To put on a hose the valve. The gate has to open access to warm air. |
| 5. To disconnect a hose. The gate has to turn and block access to warm air. If it does not occur, the valve means is faulty. |
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