truck over heats - Page 2

bradrhale · 06-06-2008, 11:43 AM

does it do this only when you shut it down or will it do it when the engine is running?? how long will it boil out for??

btw · 06-09-2008, 04:07 PM

any more ideas

wrenching40plus · 06-09-2008, 10:51 PM

You say this problem did not appear before engine was rebuilt. How long ago was that? Did you put in fresh coolant? Some of the antifreeze glycols can begin to look like spaghetti when they get too old. My recomm would be to pull the radiator and take it to a good radiator shop for flow test, maybe boil-out... Then try without the thermostat; see if that makes any difference.

btw · 06-09-2008, 10:56 PM

yes it did not do it before the engine was rebuilt.and it has new antifreeze.just got truck back a few weeks ago.

wrenching40plus · 06-10-2008, 04:31 AM

Quote:

Originally Posted by btw

....just got truck back a few weeks ago.

My recomm stands. I had exactly this problem with a Dodge B150 van with 360 v8. Radiator needed boiling-out. Suggest you talk with the person who installed the new engine, then (if indicated) get a flow test of your radiator. Also ask if there is any special procedure for filling with coolant... Don't know in your case, but with some engines you need to think about bleeding the system, for example, by pulling a heater core hose. Good luck

btw · 06-11-2008, 02:01 PM

could it be a cracked head or a bad head gasket?

Chevy_Finatic79 · 06-11-2008, 09:44 PM

do you have oil mixed with the coolant? if you do the coolant will look like creamy chocalate milk and thats dead give away the head or head gasket failed.

Wrenching40plus has a good point about some systems needing to be bled. I had it happen to me where I changed a "RAD" filled it up while running and thought it was good but while driving it started to overheat when it cooled and I took the cap off the coolant was really low.

it might not be the case with yours since it doesnt boilover until you shut it off. I'd go to a radiator shop and have the cap pressure checked

btw · 06-17-2008, 07:22 AM

oil looks fine ill have it pressure checked

436'd skylark · 06-17-2008, 05:59 PM

First I would get an accurate temp guage. "N" doesn't really tell ya much as far as actual temperature. Are you positive that its not boiling over while its running too? I think that the cooling system is just barely keeping up. you might wanna check the basics like timing and fuel mixtures.

what year is the truck anyway?

06-11-2008, 09:44 PM	#17
Chevy_Finatic79 Senior Member Join Date: Mar 2008 Location: Lincoln NE Posts: 439	do you have oil mixed with the coolant? if you do the coolant will look like creamy chocalate milk and thats dead give away the head or head gasket failed. Wrenching40plus has a good point about some systems needing to be bled. I had it happen to me where I changed a "RAD" filled it up while running and thought it was good but while driving it started to overheat when it cooled and I took the cap off the coolant was really low. it might not be the case with yours since it doesnt boilover until you shut it off. I'd go to a radiator shop and have the cap pressure checked __________________ "She's gonna Freak when she see's my wheels" 85' Chevy C-10 Longbox (Rat) TBI 5.7 Liter/THM350 90' Chevy Suburban 4x4 TBI 350 Cu.In./700R4 http://www.truckforum.org/forums/truck-pictures-176.htm

06-17-2008, 05:59 PM	#19
436'd skylark Senior Member Join Date: Mar 2007 Location: Buffalo Ny Posts: 620	First I would get an accurate temp guage. "N" doesn't really tell ya much as far as actual temperature. Are you positive that its not boiling over while its running too? I think that the cooling system is just barely keeping up. you might wanna check the basics like timing and fuel mixtures. what year is the truck anyway? __________________ 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

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06-06-2008, 11:43 AM	#11
bradrhale Moderator Join Date: Apr 2006 Location: Texas Posts: 2,968	does it do this only when you shut it down or will it do it when the engine is running?? how long will it boil out for??

06-09-2008, 04:07 PM	#12
btw Junior Member Join Date: Jun 2008 Posts: 9	any more ideas

06-09-2008, 10:51 PM	#13
wrenching40plus Full Member Join Date: May 2008 Location: South Carolina (upstate) Posts: 11	You say this problem did not appear before engine was rebuilt. How long ago was that? Did you put in fresh coolant? Some of the antifreeze glycols can begin to look like spaghetti when they get too old. My recomm would be to pull the radiator and take it to a good radiator shop for flow test, maybe boil-out... Then try without the thermostat; see if that makes any difference.

06-09-2008, 10:56 PM	#14
btw Junior Member Join Date: Jun 2008 Posts: 9	yes it did not do it before the engine was rebuilt.and it has new antifreeze.just got truck back a few weeks ago.

06-11-2008, 02:01 PM	#16
btw Junior Member Join Date: Jun 2008 Posts: 9	could it be a cracked head or a bad head gasket?

06-17-2008, 07:22 AM	#18
btw Junior Member Join Date: Jun 2008 Posts: 9	oil looks fine ill have it pressure checked