BARS Head Gasket Fix and Aux Fan control
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Northstar Engines and System Technical Discussion Discussion, BARS Head Gasket Fix and Aux Fan control in Cadillac Engine Technical Discussion; I've seen several posts emphatically stating that no "fix in a bottle" product will repair a leaking head gasket on ...
  1. #1
    gdmarques Guest

    BARS Head Gasket Fix and Aux Fan control

    I've seen several posts emphatically stating that no "fix in a bottle" product will repair a leaking head gasket on a N*. I recently used the relatively new BARS product for repairing head gasket leaks in my 1998 Deville with 150000 miles and I can tell you that it worked AMAZINGLY. I had coolant leaking into the leftmost cylinder at the firewall side of the engine, and fouling the plug. Had antifreeze in the oil, rough idle, etc...

    I followed the instructions on the bottle with the addition of removing that spark plug and pulling the injector connector so I wouldn't be spraying fuel into the cylinder. Ran the engine for 15 minutes as instructed (fairly loud with the open cylinder and tons of white smoke!) After allowing the engine to cool I reinstalled the plug and connector to the injector and started the car. IT RAN PERFECTLY. I have been running it for about three weeks now through a range of temperatures and fairly hard driving to see if it will fail. No problems so far.

    Now for the second part. My AC compressor is shot. Since the sensor switches the car to economy mode it runds warmer than I would prefer, particulalry with the head gasket "repair". I installed an adjustable thermostatic switch this weekend, tapping into the green wire on the #1 relay. This runs BOTH fans, switching on at low speed I beleive at about 185 degrees. The problem is that I immediately get a code 1660 (error in the fan circuit) and a check engine light. Anybody have a suggestion as to how to wire this in such a way as to avoid the error code?

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  3. #2
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
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    Re: BARS Head Gasket Fix and Aux Fan control

    please keep us advised on the Bar's Leak. Nobody has been able to make the repair in a bottle deal last more than a little while.
    Don't mess with Binky Bear!


  4. #3
    lusterblade's Avatar
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    Re: BARS Head Gasket Fix and Aux Fan control

    I used the Bar's Leak Headgasket repair. I believe it lasted about 2 weeks tops.

  5. #4
    tateos's Avatar
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    Re: BARS Head Gasket Fix and Aux Fan control

    I think the reason most everyone says the head gasket leaks cannot be fixed with a bottle is because usually it is exhaust gas that leaks from the combustion chamber into the cooling system, not the other way around. Another reason is that, frequently, the cylinder head bolts have let go from the block and so provide no clamping force; there is nothing that holds the head gasket tightly between the block and the cylinder head.

    I have had 2 '97 N*s fail this way, but please correct me if I'm wrong, guys.

  6. #5
    Submariner409's Avatar
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    Re: BARS Head Gasket Fix and Aux Fan control

    BINGO !!!

    Even in a cast iron head/block setup, if a head lifts and loses clamping pressure on the gasket, as opposed to the gasket blowing out completely, there's very little you can do to salvage the gasket integrity. One reason for going to the immense clamping pressures allowed by a good head stud installation. I would imagine that the Northstar block, with its open aluminum deck and cast-in liners, would distort like crazy under torque loads from only 10 bolts per side. If there were 5 or 6 bolts per cylinder (quite an engineering job), the head lifting problem wouldn't exist.

  7. #6
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    Re: BARS Head Gasket Fix and Aux Fan control

    FWIW, My money says the fix is temporary at best. In all honesty, there is only one way to repair a leaking head gasket, and it is not cheap, easy or in a bottle, but please do keep us updated.

  8. #7
    gdmarques Guest

    Re: BARS Head Gasket Fix and Aux Fan control

    While I absolutely agree with everything you all have said (and I have replaced my fair share of head gaskets over the years on other cars) all I can say is it appears to be working well so far. If this was my only car and I had to depend on it everyday for transportation I wouldn't depend on this fix, but as an occasional local driver $29 is a heck of alot cheaper than a head gasket. I could dump a bottle in every month for the next 5 years and probably still come out ahead. I've also gotten 150,000 miles out of this thing, so it doesn't really owe me anything.

    And when the thing finally lets go it should make for a heck of a show!

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    Re: BARS Head Gasket Fix and Aux Fan control

    I ran this stuff through a 2002 Impala, lasted roughly 2 months. The leak wasn't even bad in the Impala. Good luck with it.

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    Re: BARS Head Gasket Fix and Aux Fan control

    Problem with this stuff is that everyone with an H/G issue will use this stuff, sell the car like nothing is wrong and then the new owner is SCREWED!. Its already happened many times I'm sure.

  11. #10
    chubbyranger is offline Cadillac Owners Connoisseur
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    Re: BARS Head Gasket Fix and Aux Fan control

    Quote Originally Posted by Destroyer View Post
    Problem with this stuff is that everyone with an H/G issue will use this stuff, sell the car like nothing is wrong and then the new owner is SCREWED!. Its already happened many times I'm sure.
    http://www.cadillacforums.com/forums...erheating.html

  12. #11
    gdmarques Guest

    Re: BARS Head Gasket Fix and Aux Fan control

    Can aybody respond to the SECOND part of my post regarding the cooling fans?

  13. #12
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    Re: BARS Head Gasket Fix and Aux Fan control

    Easy: Return the fan(s) to normal PCM/sensor/A/C control. As designed.

  14. #13
    gdmarques Guest

    Re: BARS Head Gasket Fix and Aux Fan control

    Quote Originally Posted by gdmarques View Post
    Now for the second part. My AC compressor is shot. Since the sensor switches the car to economy mode it runds warmer than I would prefer, particulalry with the head gasket "repair". I installed an adjustable thermostatic switch this weekend, tapping into the green wire on the #1 relay. This runs BOTH fans, switching on at low speed I beleive at about 185 degrees. The problem is that I immediately get a code 1660 (error in the fan circuit) and a check engine light. Anybody have a suggestion as to how to wire this in such a way as to avoid the error code?
    See the part about my AC compressor. If I don't use the aux fan switch the car pukes its coolant if it idles at a standstill for a few minutes because the car senses low Freon and disables the compressor circuit. I assume the Engine temp sensor is malfunctioning causing the engine cooling fan not to switch on in spite of the AC problem, although the temp readout on the DIC seems to be accurate. Since jumping the green wire is causing both fans to run I think the relays are working just fine. I could spend a few hundred bucks to repair the AC, which eventually I will probably do, but in the meantime I have heard of many people installing these fan switches but seen no mention of the error code.

  15. #14
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    Re: BARS Head Gasket Fix and Aux Fan control

    If I don't use the aux fan switch the car pukes its coolant if it idles at a standstill for a few minutes
    I hate to say this, but I go back to my original statement. I think this proves that the "repair in a bottle" is not working.

  16. #15
    chubbyranger is offline Cadillac Owners Connoisseur
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    Re: BARS Head Gasket Fix and Aux Fan control

    Quote Originally Posted by gdmarques View Post
    If I don't use the aux fan switch the car pukes its coolant if it idles at a standstill for a few minutes because the car senses low Freon and disables the compressor circuit. I assume the Engine temp sensor is malfunctioning causing the engine cooling fan not to switch on in spite of the AC problem, although the temp readout on the DIC seems to be accurate.
    The engine temp sensor should be independent of the AC system function - if the car gets too hot it turns the fans on. It should be calibrated such that the fans have sufficient time and capacity to reduce the coolant temp so to not cause coolant loss. So there should be no correlation between the AC not working and the overheating problem. That leads me to one of two conclusions: a) as Ranger said the HG fix in a bottle isn't cutting it and/or b) the temp sensor is not working correctly and causing both the overheating and the code.

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