1991 subaru overheating

S

Sweet_angel

i have a 91 subaru legacy lsi and it overheats different times but i
replaced the thermosat and the manifold gaskets but it still is
overheating could it be the wate pump is bad? But my car is not leaking
water anywher some please Help me
 
When you replaced thermostat, etc., have you "burped" your cooling system? I
had exactly the same problem. After I replaced coolant, I got my car
"boiled" 3-4 times. Then I parked uphill (approximately 15-20 degree),
opened radiator cap, and run engine for approximately 20 minutes. I had
bubbles, I had "foam", I had my level got up and overflowed, and then it got
down... When it got down, I added some coolant and waited for another
"burp". After that I had no problem with overheating.
 
Sweet_angel said:
i have a 91 subaru legacy lsi and it overheats different times but i
replaced the thermosat and the manifold gaskets but it still is
overheating could it be the wate pump is bad? But my car is not leaking
water anywher some please Help me
What brand of tstat did you use? I tried a non-Subie tstat (high
price one not a cheepie) and found out that while it fit and operated
at the correct temp, the water passage was only about 50% of factory part.

Mickey
 
Sweet_angel said:
i have a 91 subaru legacy lsi and it overheats different times but i
replaced the thermosat and the manifold gaskets but it still is
overheating could it be the wate pump is bad? But my car is not leaking
water anywher some please Help me

Replace the radiator. Common problem that they clog up in the lower
section on the older subarus. Don't let the car overheat - you will
destroy the engine.
 
I agree...you might want to replace the rad, or at least get it
professionally cleaned. You could also try running the car without the
thermostat, which you can do safely.
 
John said:
professionally cleaned. You could also try running the car without the
thermostat, which you can do safely.

Yes, in an emergency or as a diagnostic tool.

Otherwise, running without the t-stat may cause more problems than it
solves. Among them, flow rate thru the cooling system's calibrated based
on having the restriction of the t-stat. I live in a rather warm part of
SoCal where summer temps run over 100 def F for quite some time. I can't
tell you how many people I know who've tried this and found their
engines didn't stop overheating when the problem was somewhere else in
the system.

Then there's the issue of how will the engine run at a temp other than
what the emissions system's calibrated for. I once thought I was smarter
than the engineers and put a lower temp t-stat in one of my vehicles for
"summer" use (an ol' timers' practice for who knows how long?) Problem
was the ol' timers' vehicles weren't computerized and working off a
variety of temperature parameters. MY vehicle ran terribly at the lower
temp--the 'puter always thought it was cold and adjusted everything
rich. Other problems may occur, too.

So I'd leave the running without a t-stat to being a diagnostic tool or
an emergency.

Rick
 

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