64 Cheyenne Posted December 17, 2013 Share Posted December 17, 2013 This is not really a DIY cause I didn't take any pics or have any intention of doing a write up. But boy did it sure work good. A little info first: 88 MJ Chief, 4.0 Renix. Converted to "open" cooling system with radiator cap in line, in top radiator hose. Still using Renix radiator. Removed heater water valve, ran straight hoses from engine to firewall. (Common mod doing away with the water valve. Problem was I wasn't getting very much heat out of the heater, and I heard of pulling both heater lines at the car wash and back flowing the core with pressure. Today I tried it, at first I was worried about too much pressure. but I remembered from hydroblasting that there was little volume to high pressure. When you insert the carwash wand into the heater hose, you are going from little hose to big hose = major pressure drop. I pushed the wand into the return side, as far as it would go, kissed the trigger a few times, then I full on rocked it. Actually had large water volume with low pressure. You should have seen the amount of crud that came out, impressive. Kept the water running full on till it ran clear. I was worried that I would cause the heater core to leak, well it didn't; if it did, I would just be replacing one that was plugged any way, so no loss if it did. After hooking the hoses back up, refilling and a purge....HEATED VERY HOT AIR. I recommend this if you have low heat, I would also be weary that this could cause your heater core to leak, if it was very old and "ready to go out". Time needed for this at the car wash, ten minutes, way worth the time and effort. Link to comment Share on other sites More sharing options...
shelbyluvv Posted December 17, 2013 Share Posted December 17, 2013 I can't say I agree with this. Although it may work, and work well. I don't think putting antifreeze in the drain is ecologically sound. If you get caught you will probably get a pretty nice fine too. Link to comment Share on other sites More sharing options...
64 Cheyenne Posted December 17, 2013 Author Share Posted December 17, 2013 Good point. Not to say that a minimal amount never ever gets spilt on the ground on accident either. Wouldn't think the amount in the heater core is a significant amount... As far as the environment goes, are car washes really a good idea, the amount of crud they wash off of cars eg: "underbody wash" at the car wash, how much fluids and oils are washed off from that. I think many more people do an "underbody wash" than do a heater core purge. I guess if I lived someplace like Californistan, I'd do this at home in a bucket with my pressure washer to be the most ecologically correct, and keep everybody happy. Link to comment Share on other sites More sharing options...
Incommando Posted December 17, 2013 Share Posted December 17, 2013 Good point. Not to say that a minimal amount never ever gets spilt on the ground on accident either. Wouldn't think the amount in the heater core is a significant amount... As far as the environment goes, are car washes really a good idea, the amount of crud they wash off of cars eg: "underbody wash" at the car wash, how much fluids and oils are washed off from that. I think many more people do an "underbody wash" than do a heater core purge. I guess if I lived someplace like Californistan, I'd do this at home in a bucket with my pressure washer to be the most ecologically correct, and keep everybody happy. Heck my big concern was how you found an open car wash with running water in Montana in December.... :yes: Link to comment Share on other sites More sharing options...
64 Cheyenne Posted December 18, 2013 Author Share Posted December 18, 2013 42* f today, T shirt weather, gets any warmer and I'm gonna get the Sporty out again.... Link to comment Share on other sites More sharing options...
carnuck Posted December 18, 2013 Share Posted December 18, 2013 Just be careful you don't use TOO much pressure or the core will pop like an accordion! Link to comment Share on other sites More sharing options...
Incommando Posted December 19, 2013 Share Posted December 19, 2013 Good point. Not to say that a minimal amount never ever gets spilt on the ground on accident either. Wouldn't think the amount in the heater core is a significant amount... As far as the environment goes, are car washes really a good idea, the amount of crud they wash off of cars eg: "underbody wash" at the car wash, how much fluids and oils are washed off from that. I think many more people do an "underbody wash" than do a heater core purge. I guess if I lived someplace like Californistan, I'd do this at home in a bucket with my pressure washer to be the most ecologically correct, and keep everybody happy. Heck my big concern was how you found an open car wash with running water in Montana in December.... :yes: 42* f today, T shirt weather, gets any warmer and I'm gonna get the Sporty out again.... It was 18 degrees and we had 14" of snow here on the day I wrote that. Link to comment Share on other sites More sharing options...
jimoshel Posted December 19, 2013 Share Posted December 19, 2013 Don't like Rocky Mountain weather? Wait 5 minutes. It'll change. Link to comment Share on other sites More sharing options...
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