1999 Cadillac Seville OVERHEATING :( - Page 4
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Northstar Engines and System Technical Discussion Discussion, 1999 Cadillac Seville OVERHEATING :( in Cadillac Engine Technical Discussion; Originally Posted by edb150 My shop has successfully repaired 98 Cadillacs with bad head gaskets, most had new water pumps, ...
  1. #46
    89falcon is offline Cadillac Owners Fanatic
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    Re: 1999 Cadillac Seville OVERHEATING :(

    Quote Originally Posted by edb150 View Post
    My shop has successfully repaired 98 Cadillacs with bad head gaskets, most had new water pumps, radiators, hoses, and fans etc etc. by the time they got to me. Unfortunately its usually the head gaskets. I have seen a couple that the test showed good but still had blown head gaskets. I have only tested 5 cars with the test as most are easily diagnosed without the test. Whoever fixes it make sure it gets inserts or studs or it will be time wasted. Not to mention money wasted.
    Mine got a new overflow reservoir (the first thing to go)...then a water pump......two hoses.....then radiator.....then heater (a fun and messy failure....)...then another hose......so I didn't bother with the "test"....pulled the engine...and upon pulling the heads, the failure was OBVIOUS.

    I think my failure happened over a pretty long period of time...it didn't just fail massively one day.....symptoms just got worse...and worse and worse...

  2. #47
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    Ranger is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    I think my failure happened over a pretty long period of time...it didn't just fail massively one day.....symptoms just got worse...and worse and worse...
    That's the norm. They never fail catastrophically. It's a long, slow painful death.

  3. #48
    ChuckDog is offline Cadillac Owners Member
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    Angry Re: 1999 Cadillac Seville OVERHEATING :(

    Good evening; Guys i just got threw re-doing a 1999 Cad. Seville STS semi complete cooling system that is redoing the water pump housing gasket, therm. replace, radiator new out the box, coolant temp. sensor,100% antifreeze not 50/50.
    But every time i drive it on the highway it shows half gauge, after getting off the highway and driving about 3mins. it starts to climb in temp. 6mins. off highway its running hot, my fan are coming on both of them, but it still rises in temp., but it seems that as long as i'm on the highway it never passes half gauge.
    Can someone guide me in the right direction away from the DealerShip?__.

  4. #49
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    Re: 1999 Cadillac Seville OVERHEATING :(



    Guide you to where? Diagnosis or repair?

    For diagnosis first check the purge line. If that's clear get a block test kit. You can borrow one from AutoZone. Run the test per the instructions to check for exhaust gases in the surge tank. Being a '99 I would not get my hopes to high though. Unfortunately, like many people you probably wasted a lot of money, time and effort throwing parts at it hoping one will stick.

  5. #50
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 1999 Cadillac Seville OVERHEATING :(

    .......... and 100% coolant freezes and boils at a lower temperature than the recommended 50/50 mix, and 100% coolant DOES NOT remove as much heat per liquid volume as 50/50. The various "water wetters" will not do a thing for you, so forget that, too.

    As Ranger posted, you need to do a thorough cooling system diagnosis and stop throwing parts at it.

    Here is approximately the temperatures you're looking at (the tick marks on the earlier 130 degree sweep gauge correspond to the ticks on this gauge)

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