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  • Heating AC and Engine Cooling
  • Radiators
  • Pontiac Montana
  • Nissan Pathfinder

How do you Flush the radiator on a 2002 pontaic Montana Where is the radiator valve?


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Answered 2007-09-23 06:18:51

What you'll need to perform a radiator flush:

* Phillips head screwdriver or wrench (whichever your radiator drain requires) * Cloth rag * Radiator Flush solution * Coolant * Funnel * Used coolant receptacle Using your owner's manual or your eyeballs, locate your radiator's drain plug. It could be anywhere along the bottom of the radiator, and will be either a screw plug, bolt plug or a petcock (simple drain valve). Be sure you have your used coolant receptacle in place under the drain before you open it up. With your coolant catcher underneath the drain, unscrew it and let the coolant empty completely. If you have a screw or bolt type radiator drain plug, remove it completely. If your radiator has a petcock, open it all the way.

Once all of the coolant has drained from the radiator, replace the drain plug and remove the radiator cap. Add the contents of the radiator flush solution to the radiator, then fill it to the top with water. Replace and tighten the radiator cap. Now start the car and let it run until it gets to its operating temperature (the place on the temp gauge that it normally stays at). Turn your heater on and move the temperature control to the hottest position. Let the car run for 10 minutes with the heater on. Turn the car off and wait for the engine to cool off. If the radiator cap or metal radiator is hot to the touch, it's still too hot to open. *IMPORTANT SAFETY REMINDER: Do not attempt to loosen or remove the radiator cap while the engine is hot. Serious injury can result! Once the engine has cooled down, open the drain and completely empty the contents of the radiator. Your radiator flush is almost finished! Depending on the size of your coolant receptacle, you might have to empty it into a separate container to make room for the second draining. No matter what, never pour coolant on the ground!

Now that you have performed a radiator flush, all you need to do is refill the radiator with fresh coolant. Replace the radiator drain plug or fully close the petcock.

Using a funnel to eliminate spills, fill the radiator with a 50/50 mixture of coolant and water. I'm a big fan of the premixed coolant that's become popular lately, it eliminates the measuring or guessing step. With the radiator filled, go ahead and fill the plastic coolant reservoir if your car has separate openings, again with a 50/50 mix. Tighten all of your caps well and you're like Fonzarelli -- cool!

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