antifreeze going down ?

vanhal · 12-30-2007, 06:08 PM

my antifreeze is going down and no leakes on the out side of the engine or heater. down 1 and a half litre in 3000 klm. could it be the lntake manifold ? any info ?? thank you ....pete

Hayden · 12-30-2007, 07:47 PM

If your losing AF and no leaks then it has to be internal. Is there white smoke coming out of your exhaust? Is your oil Milky? Can you smell it? Is your floor board saturated with it?

436'd skylark · 12-30-2007, 08:19 PM

what motor do you have? probably have a bad water pump..

Hayden · 12-31-2007, 05:05 AM

It says he has a black 98 Z71 with a 5.8l. Do they even make a 5.8? I know ford does but didn't think GM did. I might be wrong as usual though.

vanhal · 12-31-2007, 05:13 AM

thank you all for the info
in 2004 i replaced the intake gaskets ...had a leak on the out side back drivers side
may have to replace it again
and it is a 5.7 sorry about that also how do i change that on my profile

pete

Hayden · 12-31-2007, 05:18 AM

Go to user CP next to the home tab then go to edit profile on the left side of page. you can change it there

03chevy · 12-31-2007, 07:39 AM

i would put money on it that it's your intake. on gm's the back pass side mainly. use rtv black on the back of the block to the intake. and dont use a gasket there. or it will leak everytime.

vanhal · 12-31-2007, 01:06 PM

Quote:

Originally Posted by Hayden

Go to user CP next to the home tab then go to edit profile on the left side of page. you can change it there

thank you hayden have a happy new year ..........pete

fbhart@wk.net · 01-07-2008, 07:40 AM

I would bet on blown intake manifold gasket , my 2000 old style 3/4 ton with 350 engine has had almost everything possible go wrong with it. It was losing coolant, problem was intake manifold gasket, $400 solved problem at dealer.
Talked to retired GM factory engineer, he said GM should have been made to recall 350 engine to replace intake gaskets. Problem started when they changed to orange antifreeze, this antifreeze was made for diesel engines and gas engine gaskets would not hold up. However, GM dealers made millions replacing gaskets on 350 engines as most went out after warr.

Have a great Chevy truck day!!!

12-30-2007, 06:08 PM	#1
vanhal Senior Member Join Date: Mar 2005 Location: ontario, canada Posts: 102	antifreeze going down ? my antifreeze is going down and no leakes on the out side of the engine or heater. down 1 and a half litre in 3000 klm. could it be the lntake manifold ? any info ?? thank you ....pete __________________ I am gm all the way ....... black 98 Z71 3 door short box 5.7

12-30-2007, 07:47 PM	#2
Hayden Senior Member Join Date: May 2006 Location: Bay City,Michigan Posts: 365	If your losing AF and no leaks then it has to be internal. Is there white smoke coming out of your exhaust? Is your oil Milky? Can you smell it? Is your floor board saturated with it? __________________ There Is No Replacement For Displacement

12-30-2007, 08:19 PM	#3
436'd skylark Senior Member Join Date: Mar 2007 Location: Buffalo Ny Posts: 620	what motor do you have? probably have a bad water pump.. __________________ Joe 89 K2500 Chevy, Wee-Oh-five 285K miles, completly rebuilt needs a motor, bad 1962 IHC Scout All Wheel Drive (Scout speak for locking axles) 152 ci, dana everything else

12-31-2007, 05:05 AM	#4
Hayden Senior Member Join Date: May 2006 Location: Bay City,Michigan Posts: 365	It says he has a black 98 Z71 with a 5.8l. Do they even make a 5.8? I know ford does but didn't think GM did. I might be wrong as usual though. __________________ There Is No Replacement For Displacement

12-31-2007, 05:13 AM	#5
vanhal Senior Member Join Date: Mar 2005 Location: ontario, canada Posts: 102	antifreeze down thank you all for the info in 2004 i replaced the intake gaskets ...had a leak on the out side back drivers side may have to replace it again and it is a 5.7 sorry about that also how do i change that on my profile pete __________________ I am gm all the way ....... black 98 Z71 3 door short box 5.7

12-31-2007, 05:18 AM	#6
Hayden Senior Member Join Date: May 2006 Location: Bay City,Michigan Posts: 365	Go to user CP next to the home tab then go to edit profile on the left side of page. you can change it there __________________ There Is No Replacement For Displacement

12-31-2007, 07:39 AM	#7
03chevy Senior Member Join Date: Dec 2006 Location: jax,fl Posts: 991	i would put money on it that it's your intake. on gm's the back pass side mainly. use rtv black on the back of the block to the intake. and dont use a gasket there. or it will leak everytime. __________________ A dirty mind is a terrible thing to waste!

01-07-2008, 07:40 AM	#9
fbhart@wk.net Senior Member Join Date: Mar 2007 Posts: 86	I would bet on blown intake manifold gasket , my 2000 old style 3/4 ton with 350 engine has had almost everything possible go wrong with it. It was losing coolant, problem was intake manifold gasket, $400 solved problem at dealer. Talked to retired GM factory engineer, he said GM should have been made to recall 350 engine to replace intake gaskets. Problem started when they changed to orange antifreeze, this antifreeze was made for diesel engines and gas engine gaskets would not hold up. However, GM dealers made millions replacing gaskets on 350 engines as most went out after warr. Have a great Chevy truck day!!!

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