I posted here that I replaced my engine temp sensor on my 97 Legacy OBW a couple of days ago. In the process I lost about .5 gal of coolant. I added back while running the engine and will check before I go out the next couple of times.

 

I started thinking, and worrying, and as I am deathly afraid of doing a HG replcement (did one on my last car, also prone to Blown HG:banghead: ) Ill ask...

 

When replacing such a small amount should I worry about additives, type of coolant, special need to burp or remove air, etc ?

 

I used a premix 50/50 Prestone I believe.

 

TIA

Hentai

As long as the temp gauge is reading the same, you did not get air into the system. Most coolants are OK to mix.

 

Fresh coolant and a good flush is always a good thing.

I suggest you read the updated version of my method, on page 3 or 4 of this post:

 

http://www.ultimatesubaru.org/forum/showthread.php?t=21681&highlight=Coolant+replacement+without