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Buy heater bypass valve and get the best deals at the lowest prices on eBay! Great Savings Free Delivery / Collection on many items. ... FOUR SEASONS 74603 Vacuum Non-Bypass Closes Heater Valve. £37.95. Click & Collect. Free postage. Brand: Four Seasons. 2 watching. Genuine Vauxhall Vectra B Omega B Heater By-Pass Valve 95517483.That is because opening and closing based on your desire for heat is the responsibility of the heater control valve. When you want to heat up the inside of your vehicle the Chevrolet El Camino heater control valve opens a pathway for engine coolant to enter the heater core, and when you shut the heat off the valve closes that pathway.