Coolant Flush Problems

SMarlin40CL · 05-03-2006, 03:59 PM

My truck ('99 Sierra) recently hit 100,000 miles so I underwent a coolant drain, flush, and replace. I purchased a Chiltons manuel a while back to assist me in the numerous processes to complete for 100,000 maintenance. After I began draining the coolant from the radiator (through the tube), it said to remove the drain plugs on the cylinder block. I located the place on my truck where the manuel said they would be, but on one side the cylinder block was blocked by other items and on the other side there was a sort of inward hex bolt looking thing, something that I did not have the tool to remove.

Does anyone know where these plugs are or are they even necessary to remove to preform a flush? Any assistance in this process would be greatly appreciated.

Thanks, Andrew

chevyguy · 05-03-2006, 06:12 PM

Yip thats them. Not really a requirement. i just pull the thermostat housing and run a hose thru ontil the water comes out clear.

mudseeker · 05-03-2006, 06:20 PM

you can remove the small stud on the one side you talked about. the oppisite side should have a sesor you need to remove.

SMarlin40CL · 05-04-2006, 04:47 PM

Thanks ya'll I appreciate it, but what kinda tool do you use to remove those bolts?

mudseeker · 05-05-2006, 05:49 AM

i suggest getting a set of sockets with an allen wrench head on the end.

chevyguy · 05-05-2006, 12:24 PM

I spray the bolts with silicroil a few days prior to removing them. it halps them come right out.

05-03-2006, 03:59 PM	#1
SMarlin40CL Junior Member Join Date: May 2006 Location: Baltimore, MD Posts: 4	Coolant Flush Problems My truck ('99 Sierra) recently hit 100,000 miles so I underwent a coolant drain, flush, and replace. I purchased a Chiltons manuel a while back to assist me in the numerous processes to complete for 100,000 maintenance. After I began draining the coolant from the radiator (through the tube), it said to remove the drain plugs on the cylinder block. I located the place on my truck where the manuel said they would be, but on one side the cylinder block was blocked by other items and on the other side there was a sort of inward hex bolt looking thing, something that I did not have the tool to remove. Does anyone know where these plugs are or are they even necessary to remove to preform a flush? Any assistance in this process would be greatly appreciated. Thanks, Andrew

05-03-2006, 06:12 PM	#2
chevyguy Senior Member Join Date: Sep 2005 Location: ALABAMA Posts: 3,370	Yip thats them. Not really a requirement. i just pull the thermostat housing and run a hose thru ontil the water comes out clear. __________________ Friends dont let friends use body lifts USMC 92-96 USCG 98 to present

05-03-2006, 06:20 PM	#3
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 6,374	you can remove the small stud on the one side you talked about. the oppisite side should have a sesor you need to remove. __________________ i'd rather be hunting

05-05-2006, 05:49 AM	#5
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 6,374	i suggest getting a set of sockets with an allen wrench head on the end. __________________ i'd rather be hunting

05-05-2006, 12:24 PM	#6
chevyguy Senior Member Join Date: Sep 2005 Location: ALABAMA Posts: 3,370	I spray the bolts with silicroil a few days prior to removing them. it halps them come right out. __________________ Friends dont let friends use body lifts USMC 92-96 USCG 98 to present

05-04-2006, 04:47 PM	#4
SMarlin40CL Junior Member Join Date: May 2006 Location: Baltimore, MD Posts: 4	Thanks ya'll I appreciate it, but what kinda tool do you use to remove those bolts?

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