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Water in Coolant keeps boiling?

4 messages,  Last post on Aug 26, 2009 at 2:00 PM

You are in the Subaru Legacy & Outback Forum.

What is this discussion about? Subaru Legacy, Heating / Cooling, Wagon

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#1 of 4 Water in Coolant keeps boiling? by crossie

May 21, 2009 (6:09 pm)

I need some help. The water in the coolant container keeps boiling and spilling out all over the place once I finish a drive. Can anyone help. My mechanic has checked the raidiator and cap and changed the cap but it still keeps happening. Cheers

#2 of 4 HELP...Cooling Fan//Leaking Coolant by yogi56

Aug 26, 2009 (9:43 am)

Hello, have a 97' Legacy 2.2 that overheats & leaks coolant at the radiator
drain plug even though its tight. No leaks in radiator. When we run the air
shouldnt both fans run contiuously ? Chiltons describes a temp sensor
and/or thermosensor replacement. If thats the problem, does anyone know
where these parts are located??
 
THANKS FOR ANY HELP !! We are without a ride and desperate !
Markus

#3 of 4 T-stat by ateixeira

Aug 26, 2009 (11:48 am)

My 93 Miata had similar symptoms and it did turn out to be a bad Thermostat.

#4 of 4 Re: HELP...Cooling Fan//Leaking Coolant [yogi56] by xwesx

Aug 26, 2009 (2:00 pm)

Replying to: yogi56 (Aug 26, 2009 9:43 am)
If you are getting leakage at the drain plug, perhaps your system is over pressurizing? If that is the case, it points to a bad radiator cap, as any overflow should be using the overflow bottle rather than leaking out elsewhere. I am trying to remember where the temp sending unit is located, but I cannot recall precisely. I keep thinking of the oil pressure sending unit, which is on the top, front, and dead-center of the engine. *sigh* Darn memory.
 
If the car is actually overheating, how long does it take for this to happen? If the thermostat itself is bad, the overheat situation will happen very soon after starting the car (essentially, it will "warm up" and then quickly overheat). If it is a matter of the fans not running, the temp will continue to slowly climb once it reaches operating temperature, but the increase will be slow. For the fans, you need to isolate whether it is a fuse, relay, the fan motor(s), or a sensor controlling the circuit. It is helpful to have wiring diagrams (usually included with a Haynes manual and, I would think, Chilton) so you know what is connected. If you look up the name of the sensors in the book, it should point you to the location of them in their respective (inspect/service) areas.

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