Jump to content

Recommended Posts

I am in the horrible situation where my WRX 2.5 may have blown it's head gasket. I have no symptoms other than bubbling noises in the heater matrix. The noises only started when I had a blonde moment and opened the radiator cap. Car has since had the coolant changed twice once by Subaru badly and once by me (3 times as I ran for a few days on just water). Nothing seems to stop the bubbling noise. Sometimes it does not do it for days but then it comes back. Car never overheats and the coolant does not get pushed out of the overflow tank. The level rises and falls as expected. Coolant looks normal and I have no smoke from exhaust, oil is fine and no mixing with water. I have read many stories of the HG failing so I am ready for the bad news if it has gone.

Anyway can anyone recommend a sniff test kit that is below £40. Kits I have seen vary from £10 to >£100. Are these cheap kits worth the bother?




Thanks in advance.



Link to comment
Share on other sites

bubbling (water flowing sound behind the dash) in the heater matrix prob nothing to do with headgasket. Mines does it, did it before the rebuild, after the rebuild and has done for 2 years i've had the car, my old wrx did it as well.


If it's not using fluid, overheating etc etc then i suspect your worrying about nothing 🙂 By all means sniff test it but i suspect its fine.


Link to comment
Share on other sites

All my scoobies have occasionally made a "lovely bubbly" noise from behind the glove box . 

Not sure why , maybe something to do with the coolant running through the turbo core ,then expanding and cooling as it enters the heater matrix? 

Either way if it's not boiling over or losing coolant (needing to be topped up) I'd just keep a eye on it for now 

Link to comment
Share on other sites

Car does not use coolant I have been keeping a keen eye on it for the last few weeks. It did drop slightly but that is due to the colder weather as expected.

Annoying as it never bubbled for the first year and half of ownership. It now only does it sometimes.

Thanks guys.

Link to comment
Share on other sites

  • 3 weeks later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...