Question about 1999 Oldsmobile Silhouette

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Over heat told probably head gasket but want to try thermostat first is it worth the time or just believe head gskt also told if it really overheated engine no good anymore

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There is a pressure release valve (fitting) on near the thermostate housing. there maybe an airbubble in the system. while vehicle is running and heat, slightly loosen fitting to release air until you see nothing but fluids coming out

I replaced waterpump, radiator, flushed system and spend $$$$ which some of that was probably needed but in the end, I need to release the excess air out of the system. ONce I done that the temp gauge has remained normal.

Posted on Jun 14, 2010


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Is there oil in the coolant recovery tank (milky substance) or smoke out of tail pipe upon start up.If there is you have a defective head gasket.

Posted on May 24, 2010


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I have a t100 that keeps overheating we replaced everything from the water pump timing belt thermostat and it still overheating can you help me

Hi, did you recently skimmed the cyl-head? if so, then cyl-head is skimmed till last capacity, so you need to get the thicker cyl-head gskt. If not skimmed, remove cyl-head and skim it. it might be corroded or wapped.

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Need Help, Is it my intake gasket?

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Jul 02, 2012 | 1999 Chevrolet Lumina

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Changed thermostat and temp gage will not come up, and alson replaced water pump , and actuactor still no heat

The cooling system is probably "airlocked" and needs to be bled out or you have a blown head gasket. If the engine has overheated recently, the probability of a blown head gasket is very good, especially if you have the 3.0L engine. The heads on that engine are very unforgiving when it comes to overheating.

Jan 28, 2011 | 1996 Ford Taurus

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The thermostat is the engine temp controller. All the sensors do is relay information.

Are you sure your over heating. Has anyone infrared temp tested the actual temperature.

If you are really overheating a temp gun can test differnnt areas to try to find a blockage somewhere.

You could have a clogged radiator if you used a sealer in the coolant pryor to doing the head gasket.

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Cylinder head gasket

hi, if you are changing the head gasket then it may be worth checking the water pump and thermostat as it could have been one of these that failed causing it to over heat and then blown the head gasket so check the water pump and thermostat once you have the cylinder head off.

You may need the head checking to see if it has been warped but this is unlikely on this make of vehicle.

Once you have done the gasket make sure that when you fill the coolant up you only trickle the water in to prevent any air lock as this will cause it to over heat again, check for any bleed screws on the coolant system to let the air out whilst filling the coolant up,

Its best you check in the workshop manual for these as their may not be none as it could be self bleed system.

It also worth checking if the head bolts need changing as they do stretch and can cause the gasket not to seal properly so replacing these may be a good idea.

Let me know how you get on or if you need further assistance ok.

ps what makes you think the head gasket has gone??

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Believe it or not, new thermostats can be bad. Did you maybe get some adhesive on the thermostat preventing it to open fully? Is the thermostat installed with the crown up? The only other thing that I can think of, if it's a closed cooling system and the wrong radiator cap is installed, it won't hold the pressure, therefor overheating. The other thing may be the water pump. Many times the impellers will wear down internally causing to low of water flow.

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2000 olds alero overheating just minutes after start-up. I'm told its the intake gasket but it doesn't make sense. I would believe head gasket but not intake.

if there is no coolant in the vehicle it will overheat quickly also. it you added coolant its possible the thermostat is not opening causing an overheat. worst case scenerio the head gasket is the problem

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93 Caravan Anti-freeze leak

Not really. The head gasket is not mendable from outside with epoxy or inside with sealers. Good luck.

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it's head gasket or water pump, or if you are lucky the thermostat is broken.

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just to let u know they probably didnt plane the head (which means to make it straight again) which means they didnt straighten the warp out from where it over heated. alot of people just throw another head gasket on and dont have the head machined.its usually like 60 us dollars to 100 us dollars to have a head machined but well worth the extra effort to have it done right try a new thermostat also. usually when a shop cuts corners u end up with a car that still runs but runs hotter something to remember next time good luck

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