Question about 2000 Oldsmobile Silhouette

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I have a 2000 Olds Silhouette that keeps running hot. The thermostat keeps going between the 1/2 mark (when driving) to just above the 3/4s mark (when sitting still). I replaced the engine, radiator, and transmission in 2006, but in the last year or so, it keeps running hot and I'm finding that I'm having to add coolant ever so often. I can't find a leak, and I do all fluids at about every 4k.

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  • Jane Daffron
    Jane Daffron Nov 20, 2009

    It heats up more when it's sitting still. The AC died over a year ago and we haven't replaced it cause of the expense.



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That engine is FAMOUS for the intake manifold gaskets to leak. Does it run hot all the time or only when its low on coolant. When its hot and the fans are on, is the air coming through the radiator HOT? it should be, if its not HOT or LUKE WARM, the radiator isnt flowing coolant. Make sure the water pump isnt leaking. The thermostat is a pain to replace, so make shure its bad before replacing it. Does it run hot sitting still or going down the highway? If it cools on the road, check the cooling fans. They only work when the a/c is on OR till the engine is approx 230f or so.

Posted on Nov 20, 2009

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First make sure your cooling fans are working properly. As far as the coolant having to be added there has to be either a leak externally or internally on the engine unless your letting it get hot enough to boil over into the reservoir tank. One way to find a leak quickly is to do a pressure test of the coolant system. You will need a special tool to do this. It attaches to the radiator filler neck and you use a small hand pump to pressurize the coolant system to the rated psi on the radiator cap. If you don't have the tool you may be able to rent it from an auto parts store that has a loan-a-tool program. If not a repair shop can do it for you. Once you start to pressurize the system if it's leaking externally you should see it or hear it or both. If you don't then your leak may be internal meaning a possible head gasket leak. Even though your car is running fine a small head gasket leak can cause it to run hotter than normal and loose coolant. Also don't rule out the other items in your coolant system if you find no leaks like your thermostat, water pump or something as simple as a good coolant system flush may be all you need. One note, if you do the pressure test your self and your system will not hold pressure but you find no external leaks, that's another indication of a possible head gasket leak. Once you pressurize with the tool a good coolant sytem it should maintain pressure and not bleed off. Hope that helps, gl.

Posted on Nov 20, 2009

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I had this same problem, if your filling it up yet it keeps overheating. look into all the facts above however some people dont know there is a bleed system on this type of oldsmobile. they will be easy to find take off the radiator cap turn the heat all the way up and put in coolant/water mix. make sure you are useing dexcool only, open the bleeders keep repeating till you see no bubbles coming from the bleeders tighten and your good. note dont titen bleeders to tight they can break and it sucks trying to fix that.

Posted on Jan 04, 2012

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