radiator crud
Thread Starter
Intermediate
Joined: Mar 2008
Posts: 26
Likes: 0
From: Greenville SC
radiator crud
Looking into the radiator of my 74 L48 you can see white crystalline crud collected at the end of each tube. No overheating problems, stays at 170 all day even in the heat, but the crud bothers me. Is there a real radiator flush that can be bought that will dissolve this stuff and leave a bright shiny new looking radiator?
Ochsy
Ochsy
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
It's no longer in production ... but check your local GM dealer pts dept old stock for GM p/n 12346500 ... it's actually Prestone p/n AS100 that too is no longer in production .. it's a strong oxalic acid powder and it really works when used as directed ... NOTHING comparable is currently in production for over counter sale. I doubt your 170F ...'specially after SC's very hi mid-spring +100F days ... check yours with a known t'meter. If it has had the wrong sender installed during it's 34 years ... it can easily read low or hi. Call every GM pts dept for p/n 12346500 and replace t'stat and get a correct sender from lectriclimited.com.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Buy a jug of radiator cleaner at your local car parts store. Do exactly as the instructions say. You should also change out the thermostat with a 180 F hi-flo unit and a new gasket. Refill with 50/50 Dexcool/water. You will notice a considerable improvement.
