Heater Parts Back to Chevrolet Index Heater Shutoff Valves (Mechanical) Mechanical heater control valves mount on the head, block or in-line in the heater hose.   Price  Head or block mount $28.50 In-line in heater hose $14.65 Heater Control Valves This is the valve that controls the amount of hot water that goes to your heater. If it leaks, you will have a mess all over your carpet. All heater control valves of this type are $135.00 with your old one in exchange. Add $30.00 refundable core deposit until your old one is returned. Please note: Your old one must have brass water connection tubes to be eligible for refund.    Part # 1953-54, all 1215 1958, all 1212 Back to Top