Charade 1.3 Distributor 6-th gap connection

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Hi,
Please help me to locate where to connect small pipe going out from the distributor cap. Daihatsu Charade 1997 Auto.
After cambelt replacement I get the car from service and all looks OK, but after some time starts problems with engine overheating espacialy when drive with engine high load.
I found that on distributor cap the small plastic pipe going out is not connected. I expect that it is for vacum advancer, but can't find any hose to connect.
Please advise where is the connection of this.

Boris.

Its just a breather tube, it

Its just a breather tube, it does not have a connection pipe to anywhere, just a rubber L shaped cap pointing downwards.

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Current- 04 Silver YRV TURBO
Past- 91 Charade GTti, 89 Charade GTti, 98 1.3 Hi-Jet.
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