99 Cadillac Deville overheating

Tiny
JUNEBRII
  • MEMBER
  • 1999 CADILLAC DEVILLE
  • V8
  • AUTOMATIC
  • 15,000 MILES
My 99 cadillac deville has been overheating. I have replaced the thermostat, and still constantly have to add water. The car leaks water on the drivers front side. I am going to replace the botton radiator hose to see if there is a leak. If this does not work what could be my problem. I dont believe that it is a blown head gasket.
Wednesday, April 27th, 2011 AT 6:58 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 34,079 POSTS
Instead of guessing at a hose and wasting money unnecessarily, head to an auto parts store to borrow a pressure tester. Many stores are borrowing or renting tools now. Fill the radiator with water, then pump the system up to around 15 psi. That will let you search for the leak while everything is cold. Check for loose hose clamps if you see any seepage near the end of a hose.

If the leak is too slow to find this way, you can also add a small bottle of dye in the radiator. After driving long enough to warm the engine and build some pressure, you search with a black light. The dye will show up as a bright yellow stain that you can follow to the source of the leak.
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Wednesday, April 27th, 2011 AT 8:06 AM

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