This is a simple heater valve I made from plumbing parts you can buy from any hardware store. It eliminates the stock failure-prone valve with a higher flowing, more durable plumbing valve. It doesn't allow you to control the temperature of the heater from inside the car, but I've found that just leaving it on when I want heat and turning it off when I don't works fine. It requires you to cut the base off a stock valve and thread it so the other parts can screw in, so you do need a few tools, but the process is very simple and anyone should be able to do it.
Note: I bought all the parts for my heater valve from Lowe's and therefore all the part numbers are from their products. You can find them elsewhere, however.
- Watts Hose Barb Adapter ‐ #A‐390 – 1/2" Barb x 1/2" FIP
- Keeney Quarter Turn Angle Valve ‐ #101121 ‐ 5/8" OD Coarse Thread Inlet to 7/16" or 1/2" Outlet
- Watts Pipe Reducing Coupler ‐ #A‐813 – 1/2" FIP x 1/4" FIP
- Watts Brass Pipe Nipple ‐ #A‐740 – 1/4" MIP x Close
- Base cut from factory heater valve
- Cut base of heater valve off with saw. Sand smooth.
- Enlarge hole in base with 7/16" drill.
- Tap base with 1/4"‐18 NPT tap.
- Assemble all pieces using Teflon tape on the threads.
- Install onto engine and connect heater hose from heater core to 1/2" barb.
If you have any questions, please don't hesitate to ask.