94 Legacy 2.2n/a overheat

It actually did it again the other day.... I really need to flush the system replace the thermo. then see what happens.... I was reading in the Haynes manual, how to flush the complete system...it kind of sounds like a pain in the a s s...
What does the haynes say to do?

Sounds like your thermostat is pooched.

 
Last edited by a moderator:
1. get large container - put under radiator drain.

2. attach hose to drain fitting.

3. remove radiator cap to allow drainage.

4. move container under engine block.

5. remove engine block drain plugs.

6. once system is completely drained - flush radiator with fresh water from garden hose until it runs clear at drain.

7. remove cap and hose from overflow tank - flush with clean water and put back together.

8. close and tighten radiator drain fitting.

9. install and tighten block drain plugs.

10. place the heater temp. control in max heat position.

11. slowly add new coolant (50/50 mix) to the radiator until it's full.

12. add coolant to the overflow tank to the low mark.

(this is where it seems to get a bit tricky)

13. leave the radiator cap off and run the engine until the thermostat opens(coolant will begin flowing through the radiator and the upper radiator hose will become hot.

14. turn engine off and let cool, add more coolant mixture if needed

15. squeeze the upper radiator hose to expel air, then add more coolant mixture if needed

16. put radiator cap back on

17. start the engine allow to reach normal operating temp. and check for leaks...

That's what the haynes says..

 
5. remove engine block drain plugs.

I don't know what that is, just take the rad hose off the tstat housing, or just pull the housing off because you'll need to replace the tstat anyway. It's at the bottom, so whatever is gonna come out will come out.

The flushing part sounds fine.

I fill the engine back up from the top rad hose. That puts coolant directly into the block. Seems to work better that way. That will fill the engine and rad.

Then as it says. start the engine with the cap off and wait till it warms up (you'll know when the tstat is open because the temp will be up to normal, and hopefully be solid), make sure it doesn't overheat!!! Sometimes getting all the bubbles out can be a pain. It's easier if the front of the car is jacked up too. Helps the coolant get into the engine better... I've always used this suggestion and never had an issue.

Heat on max is good. The whole process kinda takes a while, but not a hard job.

Oh, also, get hose clamps if you have the stock wire type ones. They will break taking them off.

 
Last edited by a moderator:
so you take the top rad hose off the rad and fill so its going into the engine?
Yea, I pull it off the rad, put a funnel in the hose and fill'er up!

I guess it would be fine just filling the rad too
default_idk.gif


I always do it this way and have never had an issue.

 
If you flush out everything and only fill the radiator there won't be any coolant within the motor or water pump which leads to quick over heating.... Had this issue with a BMW I worked on!!! Def. Fill motor until coolant comes out upper hose and then refill radiator.

 
Back
Top