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Re: Should I Drain Coolant to Replace Heater Valve?[140-160/90] posted by John O on
Sunday, 30 April 2000, at 12:39 p.m.
No, but it's best to clamp the hoses at the firewall so you don't lose more coolant than necessary. In a shop where we have compressed air, I blow out the valve (and heater core) from the firewall side before replacing it so coolant doesn't spill inside. Otherwise use alot of rags inside the car.