How do I drain radiator.

jktuck · 01-14-2007, 05:07 PM

Hey folks, I need to know how to open the pet **** on the radiator on a 99 GMC Jimmy. I think I located it on the passenger side of the radiator, but it looks like I need some special tool to open it or either it looks broken. Want to make sure so that I don't break it trying to open it.

Thanks, Jeff

mrjohnwayne · 01-14-2007, 08:55 PM

should look kinda like a wing nut. Easy to open and close. If it is broken you can buy a new petcock for cheap and replace it. If nothing else take the lower hose loose and let her drain.

gmtech · 01-14-2007, 09:02 PM

Some are a wing nut and some have a square hole in them which a 1/4 in drive extension fits into it and just turn counter clockwise 1/4 turn then it pulls out some

791ton · 01-15-2007, 10:40 AM

Quote:

Originally Posted by mrjohnwayne

If nothing else take the lower hose loose and let her drain.

thats howi do it. just be sure to NOT be under the vehicle if you can help it

jktuck · 01-28-2007, 07:31 PM

Ok guys the 1/4 inch drive was the ticket to opening the drain. I did a quick flush on the system with the heater on full. While I was doing the flush the heater warmed the car great, but now I think the heater core is clogged because it does not heat the car. Should I flush the system again? Should I go with the longer flush process. It may sound cheap but I don't want to flush if it is not going to do anygood. I think the crappy dexcool stuff got too old and glogged it up. The radiator and engine are working fine because the operating temp is perfect.

01-14-2007, 05:07 PM	#1
jktuck Senior Member Join Date: Oct 2006 Posts: 76	How do I drain radiator. Hey folks, I need to know how to open the pet **** on the radiator on a 99 GMC Jimmy. I think I located it on the passenger side of the radiator, but it looks like I need some special tool to open it or either it looks broken. Want to make sure so that I don't break it trying to open it. Thanks, Jeff

01-14-2007, 08:55 PM	#2
mrjohnwayne Moderator Join Date: Apr 2005 Location: Texas Posts: 3,104	should look kinda like a wing nut. Easy to open and close. If it is broken you can buy a new petcock for cheap and replace it. If nothing else take the lower hose loose and let her drain. __________________ John Wayne 2000 F-350 7.3L Powerstroke 4x4

01-28-2007, 07:31 PM	#5
jktuck Senior Member Join Date: Oct 2006 Posts: 76	thanks for quick response, however???? Ok guys the 1/4 inch drive was the ticket to opening the drain. I did a quick flush on the system with the heater on full. While I was doing the flush the heater warmed the car great, but now I think the heater core is clogged because it does not heat the car. Should I flush the system again? Should I go with the longer flush process. It may sound cheap but I don't want to flush if it is not going to do anygood. I think the crappy dexcool stuff got too old and glogged it up. The radiator and engine are working fine because the operating temp is perfect.

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01-14-2007, 09:02 PM	#3
gmtech Senior Member Join Date: Dec 2005 Location: farmville Va Posts: 342	Some are a wing nut and some have a square hole in them which a 1/4 in drive extension fits into it and just turn counter clockwise 1/4 turn then it pulls out some