Check the cooling fan belt or add coolant if necessary．
举一反三
- Check the engine oil level and add if necessary．
- It is necessary to remove （） from the cooling spaces.
- It is not necessary for parents to accompany the kids and to check their 'treats'.( )
- The freight forwarder would prepare all necessary documents for exporter if necessary．
- Whilst the engine is turning， check to see that no water is leaking into the crankcase， scavenge air belt， or from （）.