Subaru overheating

60

Asked by May 20, 2015 at 11:42 AM about the 1999 Subaru Legacy 4 Dr Outback AWD Wagon

Question type: Maintenance & Repair

About 4 weeks ago my 99 Subaru Legacy Outback started overheating and at the same
time I lost all heat inside the car.  It just blew cold air.  I took it to the mechanic.  They said
that the bottom part of the radiator had a lot of frozen antifreeze in it.  They thawed it out,
put in a new thermostat, refilled the coolant, ran it for a couple of hours, driving it around,
etc and it didn't replicate.  Exactly 1 week later it did it again.  They couldn't relplicate at
the shop, so they put on a new radiator cap and again refilled the coolant and this time
the oil as well.  They were thinking that maybe the coolant didn't fully thaw last time, and
possibly the cap was failing some.  Yesterday I noticed it was starting to run hot again,
but for now I still have heat in the car.  I did put some coolant into the radiator, but its still
hot.  I'll check it again tomorrow to see if it needs more, I'm not sure if I put enough in
since the car is on a hill in the driveway.  There was a lot of bubbling when I put it in.  The
headgaskets and stuff were all replaced by the dealership just before I bought it a couple
of years ago.  The car has just shy of 100,000 miles on it.  It had not done this prior to the
antifreeze freezing.  Any thoughts?

19 Answers

1,455

If the engine is running radiator cap off is there a lot of bubbling?

3 out of 3 people think this is helpful.
60

Hmmm, I'll check that tomorrow after it stops snowing. If it is, what might that mean? Oh, the mechanics said they couldn't see any leaks anywhere.

1 out of 1 people think this is helpful.
60

I am wondering if simply flushing the system would fix it?

1 out of 1 people think this is helpful.
1,455

It would be a good idea but 1st check when the car is cold take radiator cap off top it off with water and start it is if there is a lot of bubbling

6 out of 6 people think this is helpful.
60

I will try that. What might that mean?

1,455

You mentioned bubbling on the radiator we need to make sure is not a blown head gasket, We just need to make sure the next step is to flush it I will tell you how

5 out of 5 people think this is helpful.
60

I think it was bubbling because the fluid was low. I filled it while the car was turned off.

1 out of 1 people think this is helpful.
1,455

Oh OK Then I sugest to flush it

1 out of 1 people think this is helpful.
60

I forgot that we have a really good shop in town that specializes in cooling systems. I'll set up an appointment there. Hopefully the third time will fix it for good.

56,825

If the coolant was partially frozen the first things to do would be thaw it out, flush it out, and add the proper mixture of antifreeze/ water to the cooling system. Since you lost heat it sounds like you were very low on coolant. That being said the coolant has to be going somewhere. HTH. -Jim

1 out of 1 people think this is helpful.
60

I had it towed to the garage today. They found a very small crack in the upper part of the radiator in the plastic piece that connects to the hose. Since the crack was in the radiator, technically, they replaced the whole radiator. They (and I) feel that the crack and leak were due to the initial freezing of the antifreeze in the old radiator. Hopefully this does the trick.

2 out of 2 people think this is helpful.
56,825

Thanks for the update, Amanda. Continue to monitor the coolant level and watch for leaks. Since the coolant froze the possibility exists that one of the freeze plugs popped as well. When coolant freezes it expands. In order to prevent the block from cracking freeze plugs are installed and designed to "pop" . If this happens they must be replaced or they'll leak. HTH. -Jim

3 out of 3 people think this is helpful.
60

Thanks for that tip Jim, I will keep an eye on it.

1 out of 1 people think this is helpful.
56,825

You're welcome. Glad to help. -Jim

1,020

You have probably got an airlock in your heater element. This mimics all the symptoms of a head gasket leak. Water has to flow through the heater element to bypass the thermostat and make it open up...See my full explanation and solution here: - http://www.cargurus.com/Cars/Discussion-t17159_ds614293

12 out of 12 people think this is helpful.
20

I have a 1998 subaru forester and its over heating

20

I have a 1998 subaru forester and its over heating can i get some help

2 out of 2 people think this is helpful.
20

I have a question about a 2000 legacy it's overheating the air conditioner get colder than crap when you turn it off the car over heard when you take the radiator cap off with the car running it gushes back out any suggestions on what might be wrong

2 out of 2 people think this is helpful.

Venrick,Anthony_60, I tell you that I am learning a few things about this engine, the one thing I will share that is relevant to all this is that after replacing the timing belt, water pump, guide wheels and tensioner I had a hell of a time getting the air out of the heater core, I couldn't figure out why the damn thing was overheating( the car as well as me), the clue was no heat......always keep the heater on and blowing when checking the cooling system, very important !!! You will overheat with a quickness with an air locked heater core. After filling the system, block, core and radiator, each one separate, I still had air lock....... I had to let it warm up, a little I might add cause you don't want to end up in the burn ward, and burp the air by pulling the return hose off of the core. What a pain in the ass !

Your Answer

Add photo

Related Questions

  • Subaru overheating 4 answers

    So we've got a 1999 Subaru Outback. This weekend the defrost vent started spewing steam and then it dripped on the floor really hot water. So we bipased the heater core and reconnected the hoses. ...

    1998 Subaru Legacy 4 Dr Outback AWD Wagon

    -

    Maintenance & Repair

  • '99 Subaru Outback Overheating 2 answers

    I drive a 1999 Subaru Legacy Outback that has about 149K miles on it. However I am recently been getting a serious overheating problem. At first it seemed to just be a thermostat prob but now there ma...

    1999 Subaru Legacy 4 Dr Outback AWD Wagon

    -

    Maintenance & Repair

  • Why is my subaru still overheating 12 answers

    I have a 99 subaru legacy 2.5 gt and its been overheating lately... I changed out the radiator bc it was leaking, then changed out the thermostat, only to find out there was a leak in one of the sma...

    1999 Subaru Legacy 4 Dr 30th Anniversary AWD Sedan

    -

    Maintenance & Repair

  • 1999 Subaru overheating 5 answers

    My 1999 Subaru Legacy Outback with 138,000 miles, has an overheating problem. Intermittent, and unpredictable. Coolant is full, both cooling fans run as needed, overflow reservoir is at correct level...

    1999 Subaru Legacy 4 Dr Outback AWD Wagon

    -

    Maintenance & Repair

  • Overheating subaru 15 answers

    I have a 1996 Subaru outback that kept overheating. They checked the radiator and it's perfectly fine. I had the thermostat changed today and it is still over heating. What else could be wrong wit...

    Subaru Outback

    -

    Maintenance & Repair

Legacy

Looking for a Used Legacy in your area?

CarGurus has 16,891 nationwide Legacy listings starting at $1,200.

ZIP:

Search Subaru Legacy Questions

Subaru Legacy Experts

#1 Anthony_60
Anthony_60
Reputation 1,020
#2 Nick Eidemiller
Nick Eidemiller
Reputation 680
#3 dandyoun
dandyoun
Reputation 600
View All

Related Models For Sale

Used Subaru Impreza
211 Great Deals out of 7,742 listings starting at $1,795
Used Subaru Outback
402 Great Deals out of 29,849 listings starting at $1,500
Used Subaru Forester
354 Great Deals out of 20,980 listings starting at $1,290
Used Honda Accord
1,230 Great Deals out of 77,867 listings starting at $969
Used Toyota Camry
1,499 Great Deals out of 100,432 listings starting at $700
Used Honda Civic
1,156 Great Deals out of 66,086 listings starting at $1,500
Used BMW 3 Series
1,807 Great Deals out of 40,896 listings starting at $1,250
Used Audi A4
358 Great Deals out of 13,166 listings starting at $1,599
Used Honda CR-V
1,295 Great Deals out of 73,892 listings starting at $1,650
Used Acura TL
337 Great Deals out of 7,166 listings starting at $2,000

Used Cars For Sale

2017 Subaru Legacy For Sale
10,972 listings starting at $20,899
2016 Subaru Legacy For Sale
25 Great Deals out of 890 listings starting at $17,968
2015 Subaru Legacy For Sale
32 Great Deals out of 800 listings starting at $10,995
2014 Subaru Legacy For Sale
53 Great Deals out of 1,094 listings starting at $9,990
2013 Subaru Legacy For Sale
35 Great Deals out of 735 listings starting at $7,995