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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 02 DTS overheating in Past Cadillac Vehicle Discussion; Deleted....
  1. #31
    MoistCabbage's Avatar
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    Deleted.

  2. #32
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    Re: 02 DTS overheating

    Time for a block test.

  3. #33
    02-Deville is offline Cadillac Owners Member
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    Re: 02 DTS overheating

    Ok. How do I go about doing that

  4. #34
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    Rent a block test kit from a parts store (you'll also need to buy a bottle of test fluid).

    Read the instructions (there are videos on youtube as well).

    Perform the test after an overheat.

  5. #35
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    Re: 02 DTS overheating


  6. #36
    02-Deville is offline Cadillac Owners Member
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    Re: 02 DTS overheating

    Seems easy enough. I'll hopefully be able to give if a try this weekend. If it is a cracked block/head or gasket would that explain why it seems like the coolant isn't following through the radiator?

  7. #37
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    Re: 02 DTS overheating

    Cracked heads or blocks are pretty rare. HG failures and pulled threads are another story, but not as common on the 2000+ engines as they where on the pre-2000's.

  8. #38
    02-Deville is offline Cadillac Owners Member
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    Re: 02 DTS overheating

    The car only has a 145,000 on it. so for me its hard to believe that it would be head gasket. The biggest thing I don't understand is why the radiator hoses don't get hard when the thermostat opens up and full flow should be going through there like on every other vehicle I've ever seen or worked on.

  9. #39
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    Mileage is irrelevant for HG failure.

    No pressure means there's a leak.

  10. #40
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    Re: 02 DTS overheating

    Quote Originally Posted by 02-Deville View Post
    The car only has a 145,000 on it. so for me its hard to believe that it would be head gasket. The biggest thing I don't understand is why the radiator hoses don't get hard when the thermostat opens up and full flow should be going through there like on every other vehicle I've ever seen or worked on.
    Thermostat opening and coolant flow have nothing to do with system pressure. Cooling system pressure is a result of normal coolant expansion/contraction with temperature change, and final pressure is controlled by the pressure cap on the surge tank. If you have no system pressure under normal driving conditions, the cap or surge tank rim seal is faulty.......... and I saw Post #30. If the system "blows off" coolant shortly after engine start and initial warmup, the coolant level in the surge tank is too high.

  11. #41
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    Re: 02 DTS overheating

    That would make sense cuz after I put the new cap on I let the car idel for an hour and a half in 90° heat and it was fine never even moved off the half way mark. But the next day I go and drive it 30 miles and its starts fluctuating between half and the next line. Like it would heat up then cool back down. So I let it sit for a couple of weeks and tryed it again and sam thing for about 10 minutes then it finally overheated to where I had to pull over and let it cool down before I could put more coolant in.

  12. #42
    02-Deville is offline Cadillac Owners Member
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    Re: 02 DTS overheating

    Any input?

  13. #43
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    Input on?
    Have you checked/done anything since your last post?

  14. #44
    02-Deville is offline Cadillac Owners Member
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    Re: 02 DTS overheating

    Ok I finally found some time to look at the car. I looked at the over flow tank cap and seal and it looks like the neck might be cracked. Its all crowded all the way around it and it is wet by it too like is was seeping out the last time I drove it. I'm thinking that is where the air leak is coming from.

  15. #45
    02-Deville is offline Cadillac Owners Member
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    Re: 02 DTS overheating

    Took tank off and pressure tested it. Its leaks.

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