Paul S Posted September 6, 2011 Report Share Posted September 6, 2011 Hello All To begin with I would like to thank every one who has helped and guided me in the past. Over the long weekend I was able to flush the cooling system of my '99 STS and I am finding out a lot of my local Cadillac dealers haven't surrived the hostile economic climate. I need to purchase some of the engine coolant supplement pellets GM P/N 3634621. Does any one know of an acceptable knock off product that I could buy at say... Autozone that will work in its place? Link to comment Share on other sites More sharing options...
JimD Posted September 6, 2011 Report Share Posted September 6, 2011 ....Does any one know of an acceptable knock off product that I could buy at say... Autozone that will work in its place? This is not a copy cat product; BAR'S LEAKS RADIATOR Stop Leak available at WalMart. I prefer the powder form which has "p/n G12BP" on the back of the packaging. Bar's Leaks is/was the supplier for the GM part number product. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
Ranger Posted September 7, 2011 Report Share Posted September 7, 2011 Be advised that GM no longer uses them. They tend to clog the purge line and heater core. Jim and I have opposing opinions on them, but if you want to use them, the tabs are product code HDC. Link to comment Share on other sites More sharing options...
BodybyFisher Posted September 7, 2011 Report Share Posted September 7, 2011 I use them also, they tend to minimize nuisence leaks. When I did my crossover seals, I noticed that the supplement had found a home at the seals to stop a leak there, here are a few photos of the seals and crossover with evidence of the supplement Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
rockfangd Posted September 7, 2011 Report Share Posted September 7, 2011 I use 4 supplement tabs on my deville at coolant flush, Only coolant flush. I use the barsleak. It was pointless as the dealer charged more for the same stuff with their name on it. lol. Just dont overdo it. GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
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