Cooling System Flush - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skokie · 08-12-2004, 07:05 PM

What would be the best way to flush out a cooling system without the radiator installed? (radiator is being replaced) Would taking the thermostat out from the intake manifold putting a garden hose in there and let the water flow from where the water pump is supposed to be installed do it?

Thanks

Fred T · 08-13-2004, 12:39 AM

A 5/8 or 3/4" garden hose fits over the heater hose connectors. Or you can buy a hose barb and put it on a heater hose.

I start by removing the thermostat and run water until it comes clean from every outlet. Also, don't forget to back flush the heater core.

skokie · 08-13-2004, 12:43 AM

Thanks Fred. How would I back flush the heater core?

08-12-2004, 07:05 PM	#1
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,335	Cooling System Flush What would be the best way to flush out a cooling system without the radiator installed? (radiator is being replaced) Would taking the thermostat out from the intake manifold putting a garden hose in there and let the water flow from where the water pump is supposed to be installed do it? Thanks

08-13-2004, 12:39 AM	#2
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	A 5/8 or 3/4" garden hose fits over the heater hose connectors. Or you can buy a hose barb and put it on a heater hose. I start by removing the thermostat and run water until it comes clean from every outlet. Also, don't forget to back flush the heater core. __________________ Fred There is no such thing as too much cam...just not enough engine.

08-13-2004, 12:43 AM	#3
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,335	Thanks Fred. How would I back flush the heater core?



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