how to flush coolant without heater hose? Can I use the waterpump bypass? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pwrunt3pte · 03-10-2012, 04:18 PM

i want to flush my coolant. I don't have a heater core installed in the truck. the prestone kit wants you to put a tee fitting in the heater hose and hookup a garden hose to it. I don't have any heater hoses. I do have the waterpump bypass hooked up. its a small 90 degree hose that goes from the front of the intake manifold to the top of the waterpump. i was thinking of taking the bypass hose off and adding a longer piece of heater hose and hooking it backup and putting the tee fitting in there. I believe that would allow me to pump out the old coolant. any suggestions? Has anyone tried it like this? thanks

OrrieG · 03-10-2012, 05:49 PM

should work, remember to get it up to temp so the thermostat opens up, or remove it so you get a full flush. when you hit it with the flushing water it will cool enough to close the t stat again, that is why I usually remove mine, gasket is cheap.

Handfull 54 · 03-11-2012, 07:42 AM

Dont forget to drain both sides of the block. Keep flushing the system until the water runs clear.

pwrunt3pte · 03-11-2012, 07:55 AM

thanks everyone for the input

03-10-2012, 04:18 PM	#1
pwrunt3pte Registered User Join Date: Jul 2010 Location: jacksonville, florida Posts: 21	how to flush coolant without heater hose? Can I use the waterpump bypass? i want to flush my coolant. I don't have a heater core installed in the truck. the prestone kit wants you to put a tee fitting in the heater hose and hookup a garden hose to it. I don't have any heater hoses. I do have the waterpump bypass hooked up. its a small 90 degree hose that goes from the front of the intake manifold to the top of the waterpump. i was thinking of taking the bypass hose off and adding a longer piece of heater hose and hooking it backup and putting the tee fitting in there. I believe that would allow me to pump out the old coolant. any suggestions? Has anyone tried it like this? thanks

03-10-2012, 05:49 PM	#2
OrrieG Registered User Join Date: Jun 2006 Location: Idaho Posts: 8,800	Re: how to flush coolant without heater hose? Can I use the waterpump bypass? should work, remember to get it up to temp so the thermostat opens up, or remove it so you get a full flush. when you hit it with the flushing water it will cool enough to close the t stat again, that is why I usually remove mine, gasket is cheap. __________________ 1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project

03-11-2012, 07:42 AM	#3
Handfull 54 Registered User Join Date: Jul 2011 Location: Moorpark, California Posts: 159	Re: how to flush coolant without heater hose? Can I use the waterpump bypass? Dont forget to drain both sides of the block. Keep flushing the system until the water runs clear.

03-11-2012, 07:55 AM	#4
pwrunt3pte Registered User Join Date: Jul 2010 Location: jacksonville, florida Posts: 21	Re: how to flush coolant without heater hose? Can I use the waterpump bypass? thanks everyone for the input



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.