OVERHEATING AND OUT OF IDEAS!?!?!? update pg2!
12-15-2008, 06:21 PM
#53
Registered User
Subaru's had head gasket problems, they would do the same thing, you would get bubbling in your radiator overflow, and you could hear the water boiling, but when you pressure tested it, it would pass.
The air must have to do with the boiling. water turns to steam , steam leaks out. air replaces steam?
Feel free to poke holes in my theory.
The air must have to do with the boiling. water turns to steam , steam leaks out. air replaces steam?
Feel free to poke holes in my theory.
12-15-2008, 07:57 PM
#55
Registered User
Also from combustion if it is an internal leak, air from combustion chamber can enter the coolant, with a bad gasket.
Testing for hydrocarbons in coolant is one way to tell if you have a bad gasket.
Testing for hydrocarbons in coolant is one way to tell if you have a bad gasket.
12-16-2008, 02:38 AM
#56
Originally Posted by chris_barry,Nov 30 2008, 07:44 PM
Check the headgasket with this technique.
Fit a really long hose in place of the line that goes between the radiator cap and the overflow tank. Run this around the outside of the vehicle and into the passenger window.
Bleed the cooling system and fully top up the radiator before replacing the cap.
Put the hose into a large coke ( or beverage of choice) bottle half filled with water. Make sure the water covers the hose.
Get a passenger to hang onto the bottle and go for a drive. It will take a while to purge air out of the line ( You can prime it with water first if you want).
Test the head gasket by driving at full throttle against the brakes in 3rd or 4th gear. If there is any leak it will show up as a stream of bubbles from the hose.
This test sounds pretty ghetto, but will show up a early signs of head gasket failure that are too small for pressure leak testers and most other
methods.
The water bottle wont get hot, but take care initially as if the head gasket is really stuffed you could end up with a wet assistant.
Fit a really long hose in place of the line that goes between the radiator cap and the overflow tank. Run this around the outside of the vehicle and into the passenger window.
Bleed the cooling system and fully top up the radiator before replacing the cap.
Put the hose into a large coke ( or beverage of choice) bottle half filled with water. Make sure the water covers the hose.
Get a passenger to hang onto the bottle and go for a drive. It will take a while to purge air out of the line ( You can prime it with water first if you want).
Test the head gasket by driving at full throttle against the brakes in 3rd or 4th gear. If there is any leak it will show up as a stream of bubbles from the hose.
This test sounds pretty ghetto, but will show up a early signs of head gasket failure that are too small for pressure leak testers and most other
methods.
The water bottle wont get hot, but take care initially as if the head gasket is really stuffed you could end up with a wet assistant.
12-16-2008, 11:18 AM
#57
Registered User
Join Date: Jun 2008
Posts: 280
Likes: 0
Received 0 Likes
on
0 Posts
Sometimes parts store thermostats will be defective. I had to replace 3 or 4 on a 280zx i had before getting one that was correct. Head gasket leaks can be a PITA to track down exactly where it is sometimes, if that is the case. If you do find the headgasket is the problem make sure you have the head checked for warpage. It would be a good opportunity to have a valvejob and any headwork done to accomodate future mods. GL with the troubleshooting. Keep us posted.
12-16-2008, 02:03 PM
#58
Registered User
Join Date: Apr 2007
Posts: 483
Likes: 0
Received 0 Likes
on
0 Posts
i am in the same boat,
change the thermastat, but when the fan is off" take of fan switch", the thermastat open. but when i pug it back in, the bottom hoes stays cold and the heat oges up and the thermastat does not open..???????
change the thermastat, but when the fan is off" take of fan switch", the thermastat open. but when i pug it back in, the bottom hoes stays cold and the heat oges up and the thermastat does not open..???????
12-16-2008, 03:00 PM
#59
Registered User
Thread Starter
Join Date: Aug 2008
Posts: 698
Likes: 0
Received 0 Likes
on
0 Posts
well they are still testing and they are almost positive that the problem is something to do with the head. in the morning they will be trying to make it hot almost over heated that way they can test for the hyrdro carbons with a lithium test. if this fails meaning they are present they will be starting the tear down. when they do a new head gasket they include a valve job with it so that will be done. hopefully they will get it tomorrow. i want my car back!
