Question about Oldsmobile Regency

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(1989 Oldsmobile V-6 Regency (130,000 miles) suddenly the v-6, 3.8L engine is over heating. No leaks! I can fill the overthrow bucket and the radiator before bedtime and come out in next morning and all the water is gone! And there are no indications of a leak or any water or moisture under the car, in the oil or in the street!. No steam at the exhaust when first starting the engine. I am going to replace the thermostat, because a click occurs at the driver side near the air intake) , and the passenger fan then runs. a few minutes later it stops. When it's hotter the passenger cooloing fan stops. I am going to replace the thermostate but I am not sure where it is. It looks to be a bit under the throttle body intake on the front end of the V-6 engine I filled the overflow bucket and the radiator and went to bed. In the morning there's no water anywhere in the overflow bucket or the radiator or in the engine compartment Can you tell me or send a photo of where the thermostate housing might be? Does my analysis seem logical?. Please send me by email Im off to bed now dennisesklar107@comcast.net 561 358 5318 (cell) or my home cell 561 503 4584 Your help will be most helping Dennis Sklar (Fl.)

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The thermostat is too the front of the engine,, close to the exhaust system however i dont think thats your problem.. I'm thinking a broken cylinder head gasket.. causing the radiator to pour off into the engine..

try this.. fill the radiatior with WATER,, leave cap off,, start the vehicle,, if you see water pumping back out the radiator then you have a gasket issue (cylinder head gasket).. if not,, driver around for a while with the cap off ,, if the water remains the same height then more than likely one of the radiator hoses has a micro fracture ,, this will cause the coolant to evaporate and escape in the form of steam ,, basically vanish without a trace.

let me know what happens.. maybe another expert here will have another idea.. I'll post it out in the main forum and seek assistance for you,, BTW dont post your personal info on the net like that,, its kinda dangerous..

Posted on Sep 17, 2010

  • dennisesklar Sep 25, 2010

    Micro Crack in shaft pump housing near the entrance to the housing which has no bearing (1989 with 127,000 miles )water pump shaft out of round shaft (.02 MM). With the serpentine belt loading the pump shaft housing all those miles, it caused the out of round, just enough to not drip when cold, only when hot and then it simply evaporates in the florida heat. This was a new one for this mechanic of 40 years. It was intuition that brought the answer to me, after replacing thermostat (under left front throttle body!) a new pump made of aircraft aluminum, CNC accuracy, and a stainless steel bushing and sealed and permanently packed bearing, the problem resolved. Car runs better and cooler than ever (after gapping the plugs to .06). Florida requires 50/50% water and antifreeze. Strange problem, thanks for the reply and comment of posting such personal info.

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