Question about 2001 Chevrolet Blazer

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How do you drain the radiator for a flush and fill? i can't find a petcock valve anywhere.

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See the arrow in the pic.

how do you drain the radiator for a flush and fill - 2507099.gif

That is the petcock.

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Posted on May 11, 2010

Testimonial: "Thanks, will use a flashlight and look more carefully!"

  • blueextc3221
    blueextc3221 May 11, 2010


    Looks like this when removed. Thanks!!


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1. When setting the temperature to MAX, blower level to FULL and outside air Vent CLOSED, no hot air comes out after 2-5 minutes?
If YES, when did you last flushed your radiator and is it full?
2. if more than 5 years ago, flush radiator system, instructions are usually in Owners manual. Use a bottle of Radiator cleaner, run egine hot for about 10-15 minutes, carefully open petcock in bottom of radiator to flush out radiator, WARNING, careful as flushed coolant would be boiling hot. As sson petcock is open and water start to flow out, carefully open radiator cap to enhance flushing flow. Use garden hose to fill radiator while flushing until water coming out from petcock is cold and clear.
Once clear, start engine, turn heter full and blower full blast and keep hose in radiator flowing full, leave petcock open until clear water flows out again. Once clear waters comes out, turn off engine,turn off garden hose and let water drain empty radiator. Once it stops flowing out, close petcock snug and put radiator cap on, pull off radiator coolant catch bottle, clean bottle for any debris and dirt. Drain any water, leave bottle empty and put it back onto its place.
3. Fill radiator with 1 gallon (4L) of concentrated coolant, top up radiator until full, fill catch bottle with concentrated coolant, start engine and keep it overflowing until no bubbles comes out and the radiator is fully hot. Once it is flowing good, close and connect everything. Drive with it and keep catch bottle filled as necessarry.
Good luck. Give as vote and good comment if this advise solve youor problem. Thank you.

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How tjo do a radiator flush in a 1999 Grand AM SE


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Where is the drain valve for the radiator to flush it it out. thank you, joe.


Should be a plug at the bottom or rear of radiator or remove the lower hose.

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.

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Close the petcock.

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