1996 Cadillac El Dorado I really need help finding my overh

  • V8
  • 4WD
  • 120,000 MILES
I really need some help, ive checked my thermostat and is working since it opened and closed when I checked it, I also checked the water pump to see if it was leaking and didnt see any leaks, I was told that if it would be my radiator it would stay overheating for a good period of time but it cools down when I stop driving so I figured my radiator seems to work. The problem is that I drive for atleast 15 to 20 minutes for a good distance then it starts over hearheating. I stop for a while and cools down pretty fast. So far ive put a new thermostat new water pump and upper and lower hoses. I also found out that my car had been sitting for more than half a year before I bought it so makes me wonder if the radiator is clogged up but if it was should the car over heat for a longer period of time? I had a guy check it with a tester and gave me codes that I had to get at autozone which where p1258, p1153, po306

p1258 = 1. Low oil/pressure 2. Blocked oil passage 3. Failed vct oil control valve.

p1153 = 1. Failed H02s-21- heater circuit 2. H02s-21 signal shorter the ech ground 3. Improper oxygen supply to sensor - check sensor connector and wires.

p0306= Ignition system fault-spark plug(s} 2. Vacuum leak 3. Injector fault 4. High or low fault pressure.

Thats where im at right now. Can someone please help me I dont have anyone who can help me and im really strugglin. Anyone with any type of info. Or ideas please let me know. Thank you!
Do you
have the same problem?
Monday, April 28th, 2008 AT 10:25 PM

1 Reply

Check the water pump

One way to test for a bad water pump is to squeeze the upper radiator hose when the engine is hot and idling. Careful, because the hose will be HOT! If you do not feel much coolant circulating through the hose when you rev the engine, the pump may be bad. The other cause might be a bad thermostat that is not opening properly (remove and inspect the thermostat), or a clogged radiator.
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Tuesday, April 29th, 2008 AT 8:16 PM

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