Quote Originally Posted by Dohabibi View Post
Good afternoon, I am seeking assistance from you guys to solve the issue I'm experiencing with my Nissan Urvan model 2009 (UV express). Since the van is experiencing high pressure recently, we brought it to our mechanic, he then performs the following on consecutive days, 1) Removed the Thermostat but still there is high pressure; 2) replaced the water pump and fan blade with brand new ones but again still high pressure while running; 3) cleaned both the radiator and sub radiator but last night my driver called and told me again there is high pressure, he then turn off the engine check the radiator (still full and no water leakage). He restarted the car after a few minutes and it became normal until he finished his duties. Any ideas what other possible factors that causes the high pressure? thanks a lot.
It couldn't have "higher pressure". The radiator cap that relieves the built up hydrostatic pressure couldn't get stronger but the other way around. Maybe, what you're trying to say is that the temperature is higher.
Your rad cap is designed to open at 0.9 kg/sq.cm or roughly 13 psig.
If your situation is overheating, try bleeding your cooling system.