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Chevy Silverado and GMC Sierra Radiator and Cooling Questions

55 messages,  Last post on Dec 01, 2009 at 3:07 PM

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What is this discussion about? GMC Sierra 1500, Truck

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#48 of 55 Patching leakly heater core by drainman881999 Mar 27, 2009 (10:40 am)
I have a 1999 Sierra,small block v-8. For several months,I have been smelling antifreeze,ever now and then seeing a small amount on the driveway. Just the other day saw a leak from the heater core area by the hoses. Not the hoses;but a small 90 ell shaped rubber hose.I think maybe a drain to release coolant mix if the heater core was leaking. Has anyone seen this?Is there a way to stop a small leak? Maybe some type of stop leak?
#49 of 55 '04 Silverado 5.3L "Invisible" Coolant Leak by pwryan Oct 11, 2009 (5:56 pm)
I have an '04 Silverado 5.3L with the same coolant leak mentioned in the forums. Pressure testing, both at cool and hot, revealed nothing. No visible leaks. Not a huge loss. The thought was a seeping head gasket. Coolant would just burn before showing up on the ground. Was going to try the GM pills referenced in the forums but cannot find anyplace to add them to the radiator. Any suggestions? Replies to this message: obyone (Oct 11, 2009 6:22 pm) mpcarpentry (Nov 22, 2009 1:02 pm) obyone (Nov 22, 2009 1:51 pm)
#50 of 55 Re: '04 Silverado 5.3L "Invisible" Coolant Leak [pwryan] by obyone Oct 11, 2009 (6:22 pm)
Replying to: pwryan (Oct 11, 2009 5:56 pm) Add them to the recovery tank. Not while the engine is hot though as it's under pressure. Replies to this message: mpcarpentry (Nov 22, 2009 1:02 pm) obyone (Nov 22, 2009 1:51 pm)
#51 of 55 Re: '04 Silverado 5.3L "Invisible" Coolant Leak [obyone] by mpcarpentry Nov 22, 2009 (1:02 pm)
Replying to: obyone (Oct 11, 2009 6:22 pm) I have the same problem with the '04 Chevy Silverado 5.3L. Where is the recovery tank located? and you add them when the truck is turned off? Thanks. Replies to this message: obyone (Nov 22, 2009 1:51 pm)
#52 of 55 Re: '04 Silverado 5.3L "Invisible" Coolant Leak [mpcarpentry] by obyone Nov 22, 2009 (1:51 pm)
Replying to: mpcarpentry (Nov 22, 2009 1:02 pm) The recovery tank should be located on the passenger side under the hood against the fender. Fill both the tank and the radiator when cold, start it up and allow it to reach running temperature so that the thermostat opens.
#53 of 55 LOSS OF COOLANT/5.7 by huero Dec 01, 2009 (9:32 am)
I HAVE A 95 SIERRA AND I SEEM TO BE LOSING COOLANT SAW AROUND THERMOSTAT AND REPLACED IT BUT STILL LOSING COOLANT NO BIG PUDDLES ARE ANYTHING RESERVE IS EVEN EMPTY ABOUT A DAY SO YOU WOULD THINK I WOULD SEE SOMETHING ANYBODY HAVE ANY IDEAS WOULD GREATLY APPRECIATE.
#54 of 55 coolant leak by keith76 Dec 01, 2009 (11:11 am)
I drive a 2004 GMC Sierra. I have a small coolant leak that looks like it is coming from the water pump. Is there anything I can do without replacing it? Replies to this message: obyone (Dec 01, 2009 3:07 pm)
#55 of 55 Re: coolant leak [keith76] by obyone Dec 01, 2009 (3:07 pm)
Replying to: keith76 (Dec 01, 2009 11:11 am) You could try a stop leak type of product that you can find at the auto parts store. I've heard black pepper works well too. At most though these will be temporary fixes. Eventually you will have to replace the water pump.

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