Block Heater (Frost Plug)Location - Subaru Outback - Subaru Outback Forums
LinkBack Thread Tools Rate Thread
post #1 of 4 (permalink) Old 03-16-2008, 11:21 AM Thread Starter
Registered User
Join Date: Mar 2008
Location: Calgary, Alberta, Cananda
Car: 2004, Outback H6
Posts: 10
Feedback Score: 0 reviews
Block Heter (Frost Plug)Location

I have a 2004 Outback H6. I live in a Climate that at times can get as low as -40 degrees celcius, so I want a block heater. My problem is that all the information that I find on installing a block heater(by taking out the frost plug) is for the drivers side of the engine and when I crawl under my car the only frost plug I can find is the one right next to oil filter. Where is the other one, can I use this frost plug or will it damage something, Is the location of the frost plug different on the 3.0L than the smaller engines?

nancydrew is offline  
Sponsored Links
post #2 of 4 (permalink) Old 03-30-2008, 02:57 AM
Registered User
Join Date: Jul 2007
Car: 2001 H6
Posts: 224
Feedback Score: 0 reviews
On the H6, it's not actually a frost plug but the drain plug for the block. I installed the block heater on my 2001 H6, and it IS the plug near the oil filter. You need a really weird sized allen key socket (14mm I think, or maybe 17mm) to remove the plug. Don't bother draining the rad, and the block like the instructions say, just loosen the drain plug till it's almost all the way out, have the block heater handy in your other hand, and quickly swap one for the other. I did this and lost hardly any coolant - not even enough to require a top up. This way you don't have to worry about refilling the engine with coolant, as I hear it can be a pain - and if you leave an air bubble, you can really mess things up.

rcy is offline  
post #3 of 4 (permalink) Old 04-22-2008, 12:47 AM
Registered User
CaptEditor's Avatar
Join Date: Apr 2008
Location: Moscow, ID
Car: 2004 OBW 2.5 auto
Posts: 248
Feedback Score: 0 reviews
I am planning to get a block heater for my 04 with the 2.5 engine. I did notice a strange allen sized bolt on the block when I went to change my oil. I would assume the 3.0 is similar in design. The one at has a threaded end:

Is that what it looked like on the H6?

CaptEditor is offline  
post #4 of 4 (permalink) Old 04-22-2008, 01:40 AM
Registered User
Join Date: Dec 2007
Car: 1998 Subaru Outback Ltd Wagon, 5sp
Posts: 66
Feedback Score: 0 reviews
I installed the block heater on my '97 Outback 2.5, and I don't believe much has changed in the newer engine.

Thats what it looked like. Make sure to have the 14mm hex bit. Try to get the one which you can put on your rachet with an extension, because there isn't much space to fit an allen key in there. I used an allen key, but had to turn it with a couple crescent wrenches on the long end.

On a similar note, make sure to have a big enough socket to tighten down the heater, and hi-temp thread stuff.

Check out this link for instructions to install on the 2.5.

mr_quag is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Subaru Outback - Subaru Outback Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Rate This Thread
Rate This Thread:

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome