Question about 1999 Cadillac Eldorado

4 Answers

Keep adding water/coolant. Replaced radiator, radiator cap and thermostat. Garage checked head gasket said okay may be water pump. Getting idle engine message and engine hot and stop engine message. Add coolant/water and everything is okay again for a while.

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  • rpazienza Aug 22, 2010

    I ordered a water pump and I am going to replace that next saturday. Cant tell where the water/coolant is going there is no puddles no oil in coolant no coolant in oil no funny smell to coolant???

  • rpazienza Aug 22, 2010

    also garage tested coolant system pressure and that was okay.

  • rpazienza Aug 22, 2010

    Thanks Mike but as I said already replaced thermostat. No small leaks, cant see any leaks at all. No water in oil no oil in water. Had pressure tested even went from 9 lb radiator cap to 15 lb. Losing at least a gallon of water somewhere on long drives. Seems okay in the city. Getting coolant low on the monitor and temp gage going up all the way. No steam no smoke no white smoke from exhaust.

  • rpazienza Aug 30, 2010

    Just replaced water pump which was leaking and used a combustion leak detector which came out negatice. Replaced water pump and thermostat. Drove about 30 miles and car started overheating again!

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  • Master
  • 507 Answers

If waterpump is bad, you could only drive it for about 10 minutes before it would overheat everytime. You've checked most of the correct areas. I would rebleed the system. If there is an airbubble in the system, it would overheat, blow some coolant out of the system, and run normal after adding coolant for a bit. It takes longer to overheat if there is a air bubble. Double check for small leaks under the car. Start it up, without airconditioner on, and let it run on the same spot for 15 mins. Is there a puddle on the ground? Then you still have a leak someplace.

Posted on Aug 30, 2010

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  • Master
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Do you know how the head gasket was tested? I prefer the combustion leak detector.This is placed over the fill reservoir and connected to a vacuum source.The cylinder is then filled with a chemical that changes from blue to yellow when combustion gases hit it Additionally a very good way to check for a coolant leak is a UV light.Antifreeze is very flourecent with one of these.

Posted on Aug 22, 2010

  • Jonathan S
    Jonathan S Aug 30, 2010

    Are you still losing coolant as well?Are the fans coming on?

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  • Cadillac Master
  • 1,675 Answers

Hi this might be a long shot, but what you could check is inside the car, check around the the passenger footwell area and drivers footwell area to see if it is wet, as the heater matrix might be leaking inside the car, just push down with a piece of tisue paper or some absorbent cloth to see if it is wet, then you can tick that off the list as being ok, the other thing you can do, is, if you have an old white sheet, or allot of white paper, put it down on the ground and drive the car over the top of it, keep the engine reving at about 1500 rpm, do this for about 5 to ten minuets, then reverse the car off and see if there are any signs of drips on the sheet or the paper, that way you can also pinpoint the area if it is leaking, as sometimes it is not obvious where the leak is, i had the same problem with my car it was loosing allot of water but no visible leaks, so i did this and there was a leak albeit very slight, but was enough to make me loose coolant over a short period of time...hope this helps, please rate thanks

Posted on Aug 22, 2010

  • steve morris
    steve morris Sep 08, 2010

    hi you might need to get the head checked, if you can , try borrowing a pressure gauge to see if you have any leaks in the head gasket,

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Look for a leak around the water pump area. If the vehicle is running hot then you would lose water over a short period of time through excess heat. If your headgasket is ok (look for water in the oil and oil in the water) then you will need replace the water pump and water pump gasket. Alos look at the upper and lower radiator hoses for loose clamp or small leaks. Replace the thermostat

Posted on Aug 22, 2010

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I just was reading this and had a few thoughts for you:

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