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I just converted my P12 primera with a SR20 engine.I notice however every three days i have to add about 3/4 cup of water in the coolant bottle when I used the A/C.
When I drive without the A/C there is no water loss,but i feel some heat by the accelerator pedal....there is no oil in the radiator or any milky substance under the oil cap.Tuners I need your advice.Thanks

Radiator probably have a crack in it....and is leaking water...

check n see if water pump leaking
thats the sr weakness
had 2 sr's and both water pumps had to be replaced after a while