Cooling system flush - The 1947 - Present Chevrolet & GMC Truck Message Board Network

KEH · 06-29-2005, 01:44 PM

I have a new 4 core radiator that I will be installing soon and want to flush the old coolant. I know the flush systems that can be bought at the parts store require cutting a heater hose.

Is there a better way though?

fastwillie 696969 · 06-29-2005, 02:15 PM

you can remove the drain plug on the engine some engines have a petcock on them and i would remove the thermostat and install a new one when you exchange the radiator and new hoses as well

flip66 · 06-29-2005, 05:57 PM

I used one of the flush kits I just put it in place of the heater control valve did the flush and put the control valve back in. I guess if you dont have a heater control valve it would not be that easy.

Fred T · 06-29-2005, 08:16 PM

If you go to the hardware store you should be able to buy a plastic hose adapter fitting or a hose mending fitting that fits 5/8" hose. That will allow you to hook onto a heater hose. I also use a shut-off valve so I can easily control the flow. If you put full pressure in the system, you can blow out the heater core, which is designed for 17 psi, household water usually runs 40-60 psi. This is also a good time for a new thermostat.

KEH · 06-29-2005, 10:26 PM

Thanks for the responses and good ideas.

06-29-2005, 01:44 PM	#1
KEH Better late than never Join Date: Dec 2001 Location: Columbus, IN Posts: 324	Cooling system flush I have a new 4 core radiator that I will be installing soon and want to flush the old coolant. I know the flush systems that can be bought at the parts store require cutting a heater hose. Is there a better way though? __________________ 1970 C/10 SWB Stepside

06-29-2005, 02:15 PM	#2
fastwillie 696969 ~Rest In Peace~ Join Date: May 2005 Location: CALIFORNIA NOR CAL Posts: 9,707	you can remove the drain plug on the engine some engines have a petcock on them and i would remove the thermostat and install a new one when you exchange the radiator and new hoses as well __________________ is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex

06-29-2005, 05:57 PM	#3
flip66 Registered User Join Date: Jan 2004 Location: Garland TX Dallas area Posts: 658	I used one of the flush kits I just put it in place of the heater control valve did the flush and put the control valve back in. I guess if you dont have a heater control valve it would not be that easy. __________________ 1998 Pontiac Grad Prix GTP 1969 C10 396 TH400 3.08 posi

06-29-2005, 08:16 PM	#4
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	If you go to the hardware store you should be able to buy a plastic hose adapter fitting or a hose mending fitting that fits 5/8" hose. That will allow you to hook onto a heater hose. I also use a shut-off valve so I can easily control the flow. If you put full pressure in the system, you can blow out the heater core, which is designed for 17 psi, household water usually runs 40-60 psi. This is also a good time for a new thermostat. __________________ Fred There is no such thing as too much cam...just not enough engine.

06-29-2005, 10:26 PM	#5
KEH Better late than never Join Date: Dec 2001 Location: Columbus, IN Posts: 324	Thanks for the responses and good ideas. __________________ 1970 C/10 SWB Stepside



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