radiator flush

quad · 03-15-2009, 09:29 AM

Hey gang,I've got my dually running good(new gas tank,pump, and distributor) I went to flush the engine out to put in fresh antifreeze...anyway the upper radiator hose wouldn't warm up.......the pump is working....does that sound like a bad thermosthat that's not opening up to let the coolant out of the engine? Also , I was going to install a flushing T (prestone brand).......the heater hoses from the firewall go to the top of the engine and the other goes to the radiator(not the water pump-as stated on the flush kit).....the hose to the engine is the inlet,,,right ? Thanks for your insight...Quad

merlin5577 · 03-15-2009, 11:43 AM

Sounds like air bubbles, did you bleed the system?

leolkfrm · 03-15-2009, 03:40 PM

^^ I agree it sounds like air, how long did you let it warm up? is there a bleed screw on the top of the t-stat housing?

quad · 03-15-2009, 08:26 PM

I let it warm at least 1/2 hour maybe a little more.....I dont recall any bleed valve

NonGoggleGuy · 03-16-2009, 05:38 AM

I thought if there's air in the cooling system, the engine will OVERheat, not UNDERheat...... until it's bled or circulates for awhile.

I changed the stat on my Trans Am recently (from a 195 to a 160). I lost a lot of fluid in the process. When I started it up for the first time after the change and fluid refill, it warmed up to about 230 before I shut it off. Stock temperature stays around 205 -210. It continued to do so until I bled the system. I simply opened a line right underneath the I/M with engine running. That cured it.

To me, it sounds like your stat is stuck OPEN.

leolkfrm · 03-16-2009, 10:40 AM

with the cap off how is the flow in the radiater??

bradrhale · 03-16-2009, 11:35 AM

if there is air in the system, it might overheat, it might not. all depends on the mix and how low it really is. pop the radiator cap off and watch the flow like stated above and fill if necessary.

quad · 03-16-2009, 08:12 PM

Quote:

Originally Posted by leolkfrm

with the cap off how is the flow in the radiater??

circulation seems fine

leolkfrm · 03-17-2009, 05:01 AM

with the engine off, take the cap off and squeeze the hose, can you see the coolant moving?

quad · 03-17-2009, 05:25 PM

Quote:

Originally Posted by leolkfrm

with the engine off, take the cap off and squeeze the hose, can you see the coolant moving?

yeah,theres good movement

03-15-2009, 09:29 AM	#1
quad Full Member Join Date: Oct 2008 Posts: 26	radiator flush Hey gang,I've got my dually running good(new gas tank,pump, and distributor) I went to flush the engine out to put in fresh antifreeze...anyway the upper radiator hose wouldn't warm up.......the pump is working....does that sound like a bad thermosthat that's not opening up to let the coolant out of the engine? Also , I was going to install a flushing T (prestone brand).......the heater hoses from the firewall go to the top of the engine and the other goes to the radiator(not the water pump-as stated on the flush kit).....the hose to the engine is the inlet,,,right ? Thanks for your insight...Quad

03-15-2009, 03:40 PM	#3
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	^^ I agree it sounds like air, how long did you let it warm up? is there a bleed screw on the top of the t-stat housing? __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

03-16-2009, 05:38 AM	#5
NonGoggleGuy Senior Member Join Date: Mar 2009 Location: New York State Posts: 259	I thought if there's air in the cooling system, the engine will OVERheat, not UNDERheat...... until it's bled or circulates for awhile. I changed the stat on my Trans Am recently (from a 195 to a 160). I lost a lot of fluid in the process. When I started it up for the first time after the change and fluid refill, it warmed up to about 230 before I shut it off. Stock temperature stays around 205 -210. It continued to do so until I bled the system. I simply opened a line right underneath the I/M with engine running. That cured it. To me, it sounds like your stat is stuck OPEN. __________________ Bored? Check out Project: Wreck. - The NonGoggleGuy - I'm unbelievable... believe me.

03-16-2009, 10:40 AM	#6
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	with the cap off how is the flow in the radiater?? __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

03-17-2009, 05:01 AM	#9
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	with the engine off, take the cap off and squeeze the hose, can you see the coolant moving? __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

03-15-2009, 11:43 AM	#2
merlin5577 Banned Join Date: Nov 2008 Posts: 675	Sounds like air bubbles, did you bleed the system?

03-15-2009, 08:26 PM	#4
quad Full Member Join Date: Oct 2008 Posts: 26	I let it warm at least 1/2 hour maybe a little more.....I dont recall any bleed valve

03-16-2009, 11:35 AM	#7
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 8,024	if there is air in the system, it might overheat, it might not. all depends on the mix and how low it really is. pop the radiator cap off and watch the flow like stated above and fill if necessary.

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