Coolant leak advice!!! - Page 2
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This is a discussion on Coolant leak advice!!! within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Originally Posted by DennisWRX 07 WRX - hey guys, For the past month I have been chasing a slow coolant ...

  1. #16
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    finding difficult coolant leaks

    Quote Originally Posted by DennisWRX View Post
    07 WRX - hey guys, For the past month I have been chasing a slow coolant leak that I have yet to find. I'm filling the reservoir every other day or few days. The car runs at normal operating temp but can smell burning coolant and about two times after driving there is steam in the engine bay. The dealer pressure tested it and could not find a leak. Then my dads mechanic pressure tested it and could not find anything and was pretty stumped. So I need any help or advice you may have to find this bastard. Thanks.
    Dennis,
    I am the tech manager at Prestone coolants. Sounds like a tough one to find. I use a dye in the coolant, you add it, run the engine for a while then use a black light to see the leak. You can buy the kits on ebay with dye for engine oil, trans oil, ac and coolant with the 12v blacklight for around 30 bucks. they work very well for finding difficult coolant leaks. Good luck and let us know if we can provide further information.

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  3. #17
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    Quote Originally Posted by DennisWRX View Post
    07 WRX - hey guys, For the past month I have been chasing a slow coolant leak that I have yet to find. I'm filling the reservoir every other day or few days. The car runs at normal operating temp but can smell burning coolant and about two times after driving there is steam in the engine bay. The dealer pressure tested it and could not find a leak. Then my dads mechanic pressure tested it and could not find anything and was pretty stumped. So I need any help or advice you may have to find this bastard. Thanks.
    Dennis, Prestone guy again.
    I also found this service bulliten
    NUMBER: 08-52-08

    DATE: 08/18/08

    APPLICABILITY:
    1999MY and later Impreza & Forester
    2000MY and later Legacy & Outback
    2006MY and later Tribeca

    SUBJECT: Coolant Overflow

    Introduction

    If you encounter a vehicle which experiences coolant coming out of the coolant reservoir tank, it may be caused by the radiator cap pressure valve being stuck open by debris sucked up through the reservoir tank hose. As the cooling system cools down, it sucks coolant back into the radiator. If there is debris that settles to the bottom of the reservoir tank, the hose is low enough to also suck them back into radiator. This causes the radiator cap not to seal, allowing excessive amount of coolant to escape overflowing the reservoir tank. If this condition continues over time, there will not be enough coolant in the system to maintain proper engine temperature.

    In order to correct the condition you need to clean (and test) or replace the radiator cap, clean out the reservoir tank, and shorten the hose slightly, following the repair procedure.

    Production Line Change







    The shorter coolant reservoir tank hose was used in production as shown above.

    Repair Procedure/Information

    1. Radiator Cap Cleaning

    Many caps can be successfully cleaned. The important part is the thorough cleaning of the negative pressure valve. If this is not done completely, remaining debris may result in a repeat issue. If there is an excessive amount of debris or the sealing rubber on the cap appears to be pitted or damaged, replace the cap.

    Note: If replacing the cap, skip to Step 2.








    Using clean water and a brush, thoroughly clean the cap seal surface.

    Note: A used toothbrush which has been cleaned works great.







    Manually open the negative pressure valve. Using clean water and a brush, thoroughly clean the valve (inner and outer surface) and the valve seal surface.

    Check the radiator cap valve opening pressure using a radiator cap tester to insure the cap is within specification (refer to the applicable Subaru Service Manual).

    Note: If the cap is out of specification replace it.

    2. Coolant Reservoir Tank Cleaning








    Remove the reservoir tank (refer to the applicable Subaru Service Manual).

    Using clean water, thoroughly clean the inside of the reservoir tank.

    Reinstall reservoir tank. Fill with coolant to the Full mark.

    Note: Be sure to use genuine Subaru Super Coolant or Subaru Long Life Coolant, depending upon what type of coolant is currently in the system.

    3. Coolant Reservoir Tank Hose Modification








    Remove the hose from the reservoir tank. Cut 20 mm from the bottom of the hose at a 45°angle. Reinstall hose in reservoir tank.

    Start engine and permit to fully warm up.

    Turn off engine and allow to fully cool down.

    Recheck coolant level in reservoir and add coolant if needed.

    Note: Be sure to use genuine Subaru Super Coolant or Subaru Long Life Coolant, depending upon what type of coolant is currently in the system.







    Warranty/Claim Information

  4. #18
    Registered User shadowpr's Avatar
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    Have you checked your oil?

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