- Thread starter
- #221
No worries. I appreciate any and all help. I have had both off and did my best to clean out what I could see/reach. I’m also suspecting at this point that the block drain is clogged as well based on the nastiness I was digging out with a screwdriver and the fact that the old heater valve was completely clogged.Sorry, I'm being lazy. Have you had the upper thermostat housing off? If not, start there. If thats blocked off, take off the water pump, if thats blocked off, I would start researching on here about cleaning out the block out manually. There are some good threads here on mud about doing a deep clean of the cooling passages, but to start, you need to get fluid and cleaning agent a way to get in there and do their job.