Coolant drain

[Chz]

I tried to drain the coolant as part of the installation of Stage1 injectors. I was able to turn the valve 90° but no more and no coolant would drain. Should the valve turn more than 90° or is my drain valve defective? I got around the problem by pulling coolant out of the top tank and catching a few drops that leaked at the thermostat housing but I want to know if I can get the coolant drained in the future or do I need a new valve?

[ElectricBlueGT]

Chz,

When you turned the valve, was the coolant system cap off? [It looks like a radiator cap] If not, little, if any, coolant will drain.

Scott

[Chz]

Several others are also reporting that the drain valve doesn't open. Any ideas? It's not necessary to vent the cooling system because it will pull coolant out of the over-flow bottle.

[Cal Cruzer]

I just did it over the weekend when we installed a Stage 1 upgrade on R_K_GT's car and it only turns a little. And it will come out if the cap is off

[Gear_Head]

I did my stage 1 this weekend, and turned the drain valve 90 degrees (Max Limit) removed the system cap (radiator cap) and did all that I knew how to do to the damned thing & there was no way that even a drop of fluid came out. Fortunately the cruiser was up on the lift, so I removed the lower radiator hose to drain the system. Drained it all, & installed fresh coolant. [:I]
Alan

[Chz]

I was told to turn the valve 90° and "pull it out". This is a Mercedes design. It works.

[Cal Cruzer]

We only had to drain about a quart to do the upgrade.