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© 200324 3-1 Description of components PE ENGINE COOLING SYSTEM CF65/75/85 series 2 6 3. DESCRIPTION OF COMPONENTS 3.1 PRESSURE CAP The pressure cap is fitted to the header tank by means of a threaded connection. The pressure cap has two valves: a pressure relief valve (1) and a vacuum relief valve (2). Overpressure pressure in the cooling system will increase. If the pressure in the cooling system becomes too high, the pressure relief valve (1) will open against the pressure of the spring. Underpressure the cooling system will decrease. If the pressure in the cooling system becomes too low, the vacuum relief valve (2) will be opened. 2 1 A B M201036 |