Question about 1995 Buick Riviera

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Vehicle runs hot and overheats, no thermostat,fans run full speed,waterpump appears fairly new,flushed and cleaned radiator and still same problem

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  • woggywog Apr 14, 2009

    why the radiator? Could it be headgaskets? which is more common?
    thanx in advanced

  • woggywog Apr 14, 2009

    Car is drivable, it takes approx 20 minutes to get around 220 degrees f. this is without a thermostat. I havent let it get much hotter than 220.
    I have just gotten this car for 500 bucks, knowing it had many problems. the car has 170k on it. and it a 3800 sc v6 motor.
    I have noticed bubbling in the coolant reservoir when it gets hot.

  • Dave  C
    Dave C May 11, 2010

    I didn't even know you could still get a rad rodded out. Either way, a new one is pretty cheap too, 90 bucks off ebay shipping included.

  • Dave  C
    Dave C May 11, 2010

    I'm sticking with the rad, only because I haven't seen 3800's have headgasket problems in the past. If you can somehow get your hand on the surface of the rad and feel it all over to see if it's hot or cold in spots, you may be able to confirm this. A plugged radiator will be reasonably cool as no hot coolant is flowing through it, good one is hot all over. It's probably due for a rad regardless but I should have asked a couple other questions earlier as well, sorry, I was trying to get out the door.
    Do you see any evidence of water in the oil, chocolate milkshake on the dipstick? Any evidence of this in the overflow bottle? Do you have to keep refilling the rad if you don't let it overheat?

  • Dave  C
    Dave C May 11, 2010

    Could be the headgaskets, but very hard to tell with such a brief description. Can you drive it at all, how long does it take to overheat, how long have you had the car, how long has it been doing this, how did it start happening, was the engine ever overheated, how many miles on the car, what size is the engine, does it blow coolant out the overflow when it overheats?
    I'm not trying to be a pain, just in a rush, please answer all these questions and I, or someone else will have an answer.

  • Dave  C
    Dave C May 11, 2010

    Put the thermostat back in and replace the radiator


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I would have the radiator roded out by a radiator shop, this of course requires removal of the radiator to complete the rod out.

Posted on Apr 14, 2009

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