2003 Head Gasket Repair - Page 4
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Northstar Engines and System Technical Discussion Discussion, 2003 Head Gasket Repair in Cadillac Engine Technical Discussion; My 2002 STS has the original GM 18 psi surge tank cap....
  1. #46
    Submariner409's Avatar
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    Re: 2003 STS coolant leak (possible crossover leak)?

    My 2002 STS has the original GM 18 psi surge tank cap.

  2. #47
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    Re: 2003 STS coolant leak (possible crossover leak)?

    Remember, the cap pressure is only the max. That's the pressure that the cap will vent at. I doubt a properly operating system ever gets that high.

    As MC said , the difference between a 16 psi cap and an 18 is 4 degrees (with a 50/50 mix).

  3. #48
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    Quote Originally Posted by Ranger
    As MC said , the difference between a 16 psi cap and an 18 is 4 degrees (with a 50/50 mix).
    I said that?

  4. #49
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    Re: 2003 sts coolant leak (possible crossover leak)?

    Interpolate this graphic (courtesy of Ranger).

  5. #50
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    Re: 2003 STS coolant leak (possible crossover leak)?

    Quote Originally Posted by MoistCabbage View Post
    I said that?
    Post #42

  6. #51
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    Oh that. I said the pressure difference didn't matter, but made no deference to temp.

  7. #52
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    So basically I don't need to replace the cap?

  8. #53
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    Well if it's not holding its rated pressure, you do. It's faulty, at some point it likely won't hold 16 either

  9. #54
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    Oh ok will do.

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    Now my heat only works on 85 and above, if I put on 84 and lower it blows out cool.any ideas?

  11. #56
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    Now my heat will only work on the max setting 90°, the only things I've done in the past two days are: pressure test the cooling system and I changed the purge line today.would any of these things cause this? Man it was nice not having problems for a while now they are all coming at the same time.

  12. #57
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    Re: 2003 STS coolant leak (possible crossover leak)?

    Why did you change the purge line?

    No HVAC actuator codes?

  13. #58
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    I haven't check the codes yet.the purge line was starting to get really worn where the clamp was (maybe it was on to tight)on the purge nipple, so I just changed it as a precaution.I'll check and see if I have any codes, but yeah heat works prefect only on max 90°.

  14. #59
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    Re: 2003 STS coolant leak (possible crossover leak)?

    Have you pulled the little grille out of the dash - to the left of the steering column - and blown out the tunnel with canned computer air ?

    That grille covers the thermistor and fan in the aspirator - the cabin air temperature sensor that controls heat and blend door operation. No/little airflow there and the temp control is either non-existent or sluggish. If the aspirator is working properly you should barely hear a faint whirrrrr in there - the fan is a miniature 12V muffin fan - computer board fan.

    Module replacement/fan hub oiling tips in Cadillac Tech Tips.

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    I'll give that a try sub, also when its cold I can hear the motor humming .I read for the humming the actuator has to come out and re grease the bearing.

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