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  1. #1
    Why get hot over miles?!?! GerryLP's Avatar
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    Default Why get hot over miles?!?!

    Hi folks,

    Upon returning from Bud's Roast, Gail began to give me problems again. Getting hot after so many miles. It's been a problem i have been chasing for a while.

    The usual scenario is me driving Gail cross country somewhere. She'll drive fine 4 or 6 hours, and then, the water temperature begins to creep up ever so slightly. From a solid 200 degrees F for the first four or six hours @ 80 MPH, and then climbs to 210, then 220, then 240 and so on. If I pull over and check her out, the overflow bottle is usually full. Sometimes with the auxiliary fan on in most extreme cases (240 Deg plus).

    The backfiring does come back when this happens. I can't even driver her past 50 miles because the engine just gives out. She he has made me pull over more than a handful. In the early days of the problem, I thought it was the cap losing pressure, so I got an 18 psi cap. It only delays the problem.

    So given the latest episode, I decided to pull out the radiator. It is now being gone over. The folks found a crack on the solder to the left tank, which seems to validate the long periods of driving problem-free. But I am not stopping there. I am replacing the water pump (the old "might as well" syndrome lol). I'm also contemplating pulling the intake and reseal the intake to the heads. I'm have not decided 100% to do this yet, but if the radiator folks tell me that it did not have major problems, I'm guessing that the motor is working too hard.

    It it is hard to believe, it has been nine years since I put the engine back together, so I am checking it out in case the gaskets have deteriorated from sitting in the garage.

    That is the other thing. She seems to break down from long periods of un-use. And that is my fault. Four weeks ago I drove her to work, but in my drive way i found out that her tires were at 15 psi. Yikes!!!

    So keep 'em driving. They are like us. Breakdown from non usage. Lol
    Last edited by GerryLP; 04-21-15 at 07:13 PM.
    GerryLP

  2. #2
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    Quote Originally Posted by GerryLP View Post
    That is the other thing. She seems to break down from long periods of un-use. And that is my fault. Four weeks ago I drove her to work, but in my drive way i found out that her tires were at 15 psi. Yikes!!!

    So keep 'em driving. They are like us. Breakdown from non usage. Lol
    I'm convinced that it cost just as much to drive a car as it does to leave it sitting around.

  3. #3
    Moderator bill81vette's Avatar
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    Gerry, have you checked the t-stat as well....that helps to control the engine temp as well....if its weak it could contribute to your problem....
    Bill and Gail...save the wave
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  4. #4
    Why get hot over miles?!?! GerryLP's Avatar
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    Quote Originally Posted by bill81vette View Post
    Gerry, have you checked the t-stat as well....that helps to control the engine temp as well....if its weak it could contribute to your problem....
    Yes. It even now has a so called "fail-safe" t-stat.
    GerryLP

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    Fan clutch slipping?

  6. #6
    Why get hot over miles?!?! GerryLP's Avatar
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    Quote Originally Posted by Antz81 View Post
    Fan clutch slipping?
    I replaced it last before pulling the radiator. In fact, I thought I had fixed the problem. Perhaps that is why it seems to run fine for four to six hours. And it ran slightly higher.

    The radiator shop called me yesterday and suggested i buy a new core. And I was like,"but this core may have been purchased in the late 90's, but it does not have barely 7K miles!". It looks brand new inside. So I'm not sure if they are just trying to sell me a new core and being lazy about fixing mine.

    I'm calling Dr. Rebuild this morning.
    GerryLP

  7. #7
    Moderator bill81vette's Avatar
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    Gerry,hows your air dams around the radiator????
    I wonder if the upper dams are letting air over the top of
    the radiator after a while.....
    Just a thought....
    Bill and Gail...save the wave
    NCRS member 42415
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  8. #8
    Why get hot over miles?!?! GerryLP's Avatar
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    Quote Originally Posted by bill81vette View Post
    Gerry,hows your air dams around the radiator????
    I wonder if the upper dams are letting air over the top of
    the radiator after a while.....
    Just a thought....
    Bill,

    Do you mean the foam seals? There are remnants still there. But having the bigger radiator masked the problem, I suppose. Perhaps with a 3-row regular radiator it is indispensable, but with the four row radiator, never a problem before. But you are right. I plan to put new ones when the radiator returns to its place.
    GerryLP
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  9. #9
    Moderator bill81vette's Avatar
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    Yes! Gerry,the foam seals.... they help deflect the air from going over the radiator to going thru it...
    which could be your problem,perhaps some of the air is going thru,
    but eventually not enough,as it causes the radiator to over heat,the longer you drive it.
    Bill and Gail...save the wave
    NCRS member 42415
    1981 St.Louis car #2735
    all matching numbers

    born Sept 18,1980
    Cruisefest 2008
    Cruisefestous 2009
    Cruisefest 2010
    Cruisefest 2011
    Cruisefest2012



    Without Trucks......
    You would be Hungry,Homeless and Naked!!!!!!



  10. #10
    Why get hot over miles?!?! Scottsredvette's Avatar
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    What kind of coolant do you use and how often had you changed it? Was the old one plugged at all?
    Last edited by Scottsredvette; 04-25-15 at 02:07 PM.
    I don't like making plans for the day. The word "premeditated" is not useful when it gets thrown around a courtroom.




  11. #11
    Why get hot over miles?!?! GerryLP's Avatar
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    Yes, I'll install new ones, Bill.

    Coincidentally, I just got a call from Dr. Rebuild. Doc himself researched it, and the ZN1 radiator nor replacement exists. He suggested I re-core.

    I'm sure I can fit another radiator, but hanging on to originality, or at least the appearance of originality (such as in a core replacement), is important, otherwise, it will cease to be Corvette in the true sense, and becomes a resto-mod or close facsimile. lol

    The radiator place is offering to re-core it with a core that has 20% more tubes (vertically, it fits more tubes in between the fins TIMES the circuits totals (4-core)). Again, not original. A bit of cheating perhaps. But how much is worth peace of mind on a long drive?

    On the other hand, they can core it with the original number of tubes. And that has always worked. Just not cheap either way.
    GerryLP

  12. #12
    Why get hot over miles?!?! GerryLP's Avatar
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    Quote Originally Posted by Scottsredvette View Post
    What kind of coolant do you use and how often had you changed it? Was the old one plugged at all?
    Usually Prestone. Changed four times since 2007, but refreshed a lot more lately with the problems I have described.

    Here is a shot of what it looks like now inside.



    second shot

    GerryLP
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  13. #13
    Why get hot over miles?!?! Scottsredvette's Avatar
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    Was not aware of that package on Corvettes. I knew about the gymkhana suspension but didn't know RPO ZN1 included the trailering chassis equipment, too. What all did that consist of (besides the hd radiator)?
    I don't like making plans for the day. The word "premeditated" is not useful when it gets thrown around a courtroom.




  14. #14
    Why get hot over miles?!?! GerryLP's Avatar
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    Quote Originally Posted by Scottsredvette View Post
    Was not aware of that package on Corvettes. I knew about the gymkhana suspension but didn't know RPO ZN1 included the trailering chassis equipment, too. What all did that consist of (besides the hd radiator)?
    Scott,

    Back in those days some folks were adding hitches to their Vettes. My understanding is that the dealership installed the old hitches, not like the ones in todays trucks. (200 lbs tongue weight at most).



    And here is how many had the option:

    Last edited by GerryLP; 04-27-15 at 11:33 PM.
    GerryLP
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  15. #15
    Why get hot over miles?!?! GerryLP's Avatar
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    I dropped off the radiator at another shop. This one is a 71 year old guy that specializes on old car radiators (like early 19 century cars). He showed me how my radiator core is fine. There is one small leak in one of the tubes near the left tank though, but he said that would not be a problem.
    GerryLP

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