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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   2006 Toyoto Camry XLE Driver Side Electric Window Trouble Hello, Looking for a little brain help ...   Tierod end change caused some kind of leak Hello so I just took my car to the nearb...   2011 Dodge Nitro OBD scanner seems to drain battery in 10-20 minutes When I bought this car in summer 2023, a... Grounding Cable, 2017 Jeep Renegade Trailhawk The Cable that connects my negative batt... Rough Idle (Found new thing) Hi everyone. First of all sorry for bad ...     equipment hey yall. im a first year engineering st...   HELP I have a 1956 1/2 ton panel truck, 69 35...   Howdy     Just wanted to s...   ABS/Tractiob/Brake Lights on But No DTCs Hello all, Recently while driving m...   Chevy strut replacement I'm trying to get a sensor of some kind ...

Search Auto Parts Search Ho do I completely drain the cooling system? Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Car Troubleshooting jamextras New User Apr 22, 2012, 6:13 AM Post #1 of 3 (2447 views) Ho do I completely drain the cooling system? Sign In I just recently bought another 96 Blazer and the previous owner left a partial jug of green coolant in the back. I must assume that he's been topping the truck off with it. The problem is, when I when to back flush the the heater core, red coolant came out. What i need to know is how do I completely drain, Flushand clean every single hose, tube and passage way the coolant sees during its circuit. I, and I'm sure many others would greatly appreciate comprehensive step-by-step insructions on how to do this. So far I've only been able to find summaries of this with no mention of the drain plugs on the engine itself (or their location) and how-tos on just flushing the radiator or heater core. Complete step-by-step instructions would be a serious help. Thanks 1996 Chevy Blazer 4.3L V-6 201000 miles Hammer Time Ultimate Carjunky / Moderator Apr 22, 2012, 7:32 AM Post #2 of 3 (2425 views) Re: Ho do I completely drain the cooling system? Sign In You're trying to turn something as simple as lunch into a complicated 3 day process. Flushing a cooling system isn't rocket science. It really depends on what kind of problem that you are trying to cure. If you just want to get all the old coolant out, they make an exchange machine that connects to the upper radiator hose. If you have a heater core that is plugged up, you can try disconnecting the heater hoses and flushing it with a garden hose but you will probably end up replacing the core. Same goes for the radiator. If you have a rusted and sludged up system, you may never get it clean and if you do, you will create some new leaks in the process as the sludge that is covering them is washed away. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. zmame Veteran / Moderator Apr 22, 2012, 7:33 AM Post #3 of 3 (2422 views) Re: Ho do I completely drain the cooling system? Sign In Flush machine would be ideal, but since your at home it's not really an option. Drain the cooling system and leave the valve open. Flush out the rad with water fill the rad with water with the valve open enough for decent flow. Start the truck and run till at operating temp The water will look clear until the the truck gets to temp then the thermostat will open and you will see it change color Run for about 20 mins at operating temp shut truck off and drain. The block will be full of water now. Add about 3/4 of a jug of straight coolant, then add 50/50 mixed. Run truck again to operating temp with cap off to let air escape. Put cap on test drive and re-check level and strength.   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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