Hamfisted
Full Access Members
You can get the heater valve from Rock Auto and replace it yourself to stop the leak. You should take the coil packs off #3 & #4 and blow the sparkplug wells out with compressed air to get any coolant out of there.
https://www.rockauto.com/en/catalog...355,heat+&+air+conditioning,heater+valve,6860
https://www.rockauto.com/en/catalog...355,heat+&+air+conditioning,heater+valve,6860