Flushing coolant, need translation from FSM - Chevy Impala SS Forum
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post #1 of 6 (permalink) Old 10-05-2001, 05:15 PM
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Hey guys,

Getting ready to flush what's left of the antifreeze in my '93. I'm looking at the FSM here, page 6B-6, and have a question or two. From the process:
3. Open drain cock assembly
I assume that's the drain under the radiator

4. Remove drain hole plug and knock sensor, located on either side of engien block assembly.
I looked all through the FSM and couldn't find mention of either of these things. Will it be obvious when I get under the car what I'm supposed to remove? Or do I really even need to?

5. Close drain cock assembly.

6. Install drain hole plug and knock sensor
This must be after all the fluid has drained out. But I thought you were just supposed to run it and keep putting water in to flush it out continuously?

Thanks for any help if you have it. [img].gif[/img]
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post #2 of 6 (permalink) Old 10-05-2001, 05:41 PM
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I surgest, do it once and do it right. Pull the thermostat, lower radiator hose, knock sensors. Pull the heater hoses. Flush the entire system with clean water until it is really clean. Be sure to clean the plastic tank. Put in a new thermostat, a 50/50 solution of antifreeze and water. Make sure you bleed the air out of the system and make sure that the plastic tank is kept at 3/4 inch higher than the full line to prevent sucking air into the system.
post #3 of 6 (permalink) Old 10-05-2001, 05:53 PM
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<BLOCKQUOTE>quote:</font><HR>Originally posted by RJI:
I surgest, do it once and do it right...<HR></BLOCKQUOTE>

..so where's the knock sensor? And how do I go about checking for air bubbles? I've never done this before, guys. I'm cashing in some cluepons. [img]0.gif[/img]
post #4 of 6 (permalink) Old 10-05-2001, 06:47 PM
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The knock sensors are located on the lower part of the engine block, one on each side of the motor. The passenger side is located just in front of the starter, the drivers side is a little harder to see, kind of behind the a-arms. Make sure the car has cooled off when you remove them! I had to remove the starter to get to the passenger side one. These things are sometimes hard to remove because the outside part of the sensor detaches from the threaded part, making it impossible to turn.
I did the fluid change on a lift, it was tough even having the car in the air. I'd go to a place that has a coolant exchange machine, they can get most of the old coolant out without going through all of the hassle of removing the sensors. Bottom line, it's not a fun job, good luck if you attempt it. Narti.
post #5 of 6 (permalink) Old 10-05-2001, 07:18 PM
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<BLOCKQUOTE>quote:</font><HR>Bottom line, it's not a fun job, good luck if you attempt it. Narti.<HR></BLOCKQUOTE>

Yikes. Screw that; I don't even have the best place to do it. People had told me "just open the drain plug in the radiator, stick the hose in the tank and run it til no more coolant comes out." Guess I'll head to Jiffy Lube tomorrow morning.
Thanks again!
post #6 of 6 (permalink) Old 10-05-2001, 08:03 PM
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Stay away from the coolant exchange place. Go to a few small shops and tell them what you want done and get it done right. It's not a hard job and any quality shop can handle it. It will save you in the long run in water pump replacements, heater core replacement, and clogged heater core and radiator. You should be able to find a shop to do the entire job for about $50 plus parts.
I owned my own shop for over 20 years,
ASE certified, and taught auto repair. Believe me when I say it will be money well spent. Good Luck!
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