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Cadillac Seville / Cadillac Eldorado Forum Discussion, 99 STS Running Hot in Past Cadillac Vehicle Discussion; If you got gunk out of that fitting, and now its flowing water with the engine running, you will be ...
  1. #46
    Mark C's Avatar
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    Re: 99 STS Running Hot

    If you got gunk out of that fitting, and now its flowing water with the engine running, you will be amazed when the temperature gauge points straight up from now on. Its hard to believe what a difference that one line makes. The purge line is probably the most important part of your cooling system, because without it the water pump can't move enough water thru the cooling system to keep the engine cool. The gunk was probably the old GM sealant tab residue, the stuff stays like a soft mud until its exposed to air, then it starts to solidify. If there is a bunch of that stuff in there, it's probably a good idea to get the radiator professionally flushed, and not put any new tabs back in.

    Fill the coolant tank until that angled rod that you can see looking in the top of the tank that goes across the tank is half underwater with the engine cold.

    One more check, inside the nipple on the surge tank is a brass restriction orifice, make sure that is clear as well, you need something really small, to stick in there, like a single strand of picture hanging wire as the opening isn't much larger than a 32nd of an inch. Put the hose back on the surge tank end first and blow thru it to make sure its clear.

  2. #47
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    maiahsdad is offline Cadillac Owners Fanatic
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    Well I did all of the things you asked, but still needed to take it down to the garage. They found no pressure leaks and the block test still is good. But now I'm back on the side of the road because the car is overheated again so I'll sit and wait again.

  3. #48
    Mark C's Avatar
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    Re: 99 STS Running Hot

    You got water flowing out of the purge line, and it still overheated that fast?

  4. #49
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    maiahsdad is offline Cadillac Owners Fanatic
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    Quote Originally Posted by Mark C
    You got water flowing out of the purge line, and it still overheated that fast?
    Still no coolant coming out of the purge valve.

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    You all have been so very helpful to me. And out of all of these damn cars that I've seen in the Indianapolis area, it's hard to believe that not one damn soul other than myself is a member of this forum. Or maybe there are other members from Indianapolis in this forum but they may be afraid I might ask them for help.

  5. #50
    Mark C's Avatar
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    Re: 99 STS Running Hot

    You have to have water spitting out of that hollow bolt, or your just going to end up on the side of the road everytime. The bolt portion of that line is at least an inch long, and then you hit the crossover manifold where the bolt is threaded into it, if you can't get something into that fitting at least 2" your not getting to the water passage in the crossover manifold. If need be pull that bolt off (it just unthreads) and drill it out with a drill. After that disconnect it at the surge tank and blow thru the whole line from where it fits over the hollow bolt to the surge tank connection to make sure the lines are clear. If you can't clear the lines get a new peice of rubber fuel line and run it directly from the hollwo bolt to the surge tank until you can clear the passages in the throttlebody, or the rubber lines leading to and from it.

  6. #51
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    Finally made it to Car Tech here in Indy. That's the name. $73 to check it and give me information on what they think. They're Caddy specialists. They say block test can only be effective if really hot. And that the hose will ONLY spit out coolant if the thermostat is open ( which mine was).

  7. #52
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    Re: 99 STS Running Hot

    And that the hose will ONLY spit out coolant if the thermostat is open ( which mine was).
    Not sure I would agree with that, but not sure I can argue the point with any real confidence either.

  8. #53
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    Well they've finished. Blown head gaskets. $4900. Guess I'm walking.

  9. #54
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    Re: 99 STS Running Hot

    You can get it done for around $2000 if you can get it up here.

  10. #55
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    Re: 99 STS Running Hot

    Are you sure they are Northstar specialists? The two things they mentioned are all wrong. Block test can be done any time but right after when you added coolant. Opening a hot cooling system will result in massive coolant expensions anyway. Also the purge line will flow as soon as the water pump starts turning, doesn't matter if the thermostat is open or closed.

    Take all the purge line out but the hollow bolt, and do some test.

    If it's before the hollow bolt that is clogged (nothing coming out of the hollow bolt), take off the hollow bolt, and I'd suggest using some kind of things like straightened hanger or thick wire to clear the water pump side. If I remember correctly, the hollow bolt is lower than the top of the cooling system, so when the hollow bolt is out, it should leak coolant even when the engine is off.

    If when the whole line is removed and it leaks coolant from the hollow bolt (but you get no coolant from the other end of the purge line when all connected), suspect that the blockage is either at the middle of the hose or at the throttle body fittings. In that case you can try running an adequate length of reinforced 3/8" rubber hose(you can get power steering pressure hose from large auto parts stores) connecting directly from the hollow bolt to the surge tank nipple, until you can get the blockage cleaned.

    EDIT #1: Well, it looks like I'm a bit late here. But do still check for the blockage, I don't think I'd believe all of what they are saying. Block test was negative and it's suddenly a head gasket issue?

  11. #56
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    Re: 99 STS Running Hot

    The purge system operates 24/7/365, cold or hot, thermostat shut or open. The purge circuit has nothing to do with the thermostat. Trace it out and you'll see that the purge circuit dumps coolant from the water pump discharge side high point to the reservoir..........the reservoir is connected by its lower 3/4" hose into the heater return circuit to the water pump/thermostat cover, and the entire cooling system operates under equal pressure, so the coolant dumped into the reservoir will, according to hydraulic theory, find its own level according to the pump rate of the system i.e. the reservoir will never run dry in a properly sealed system.

    If your engine runs at 190 - 196 in frigid weather the thermostat is only open 10% to 40% - the thermostat only allows a small amount of coolant to circulate through the radiator in cold weather: warming your body with the heater circuit takes care of the rest.

  12. #57
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    Re: 99 STS Running Hot

    Block test was negative and it's suddenly a head gasket issue?
    Yeah, I'd like a little more clarification on that as well. I'd also still like to see that purge line flowing before I condemn the HG's.

  13. #58
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    He showed me the test this time after I traveled there. It's green instead of dark blue. He said that yellow is not accurate in all tests. Yes, this company only has daddy's in their bays. Seems this is all they do. Lots of awards from caddy dealers. Google them. Car Tech. Cadillac Specialists on their signage and cards.

    ----------

    Quote Originally Posted by Ranger
    You can get it done for around $2000 if you can get it up here.
    Up here where?

  14. #59
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    Re: 99 STS Running Hot

    Palatine Ill.

  15. #60
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    Does anyone k ow of a. Temporary fix to get me through the winter with my car? I have NO money for another car, and I still have another year to pay $255 per month on this one.

    The award-winning, very curt caddy specialist here in Indy just said its $4900 to get it done and moved on to the next customer. His work load was very clogged. I'm glad he worked me in. But it is, what it is.

    I live 45 minutes from work and sometimes the traffic sits still for 10 min at a time.

    I can't afford to rent a car for many days either, and I've always been the one to help family and friends. I've called I bet 30 people over the last 15 hours and NO ONE can help. And my ex says she's not bringing my 8yr old daughter to see me (we alternate weeks). It's rough.

    Any ideas, please let me know. I'm drowning here.

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