Overheatting

[MattEnderle]

My 00 LS is overheating. I replaced the thermostat with OEM part - no difference.

I read that turning the heat on full blast will help...

When I do this is keeps the temp down to normal all together...

Would this lead you to believe that my issue is radiator? I don't see any leaks in antifreeze / tank seems about same level as always. It does look like my radiator is bent a little bit, not real bad though..

Any thought/suggestions are greatly appreciated.

 

[treanor21]

sounds like it may be your water pump...maybe just the gasket is leaking

 

[MattEnderle]

Is there any other way to check to see if its the water pump?

The fan is extremely loud too.. I wasn't sure if the fan tends to have problems - it moves freely.

I changed the thermostat gasket if that is what you mean by gasket.

 

[treanor21]

if the water pump is leaking there will be a slight drip from the gasket

 

[MattEnderle]

which gasket the thermostat or water pump gasket?

 

[treanor21]

water pump

 

[tireman]

Not water pump, look here....

This is a common problem, search the board for overheating, it is probably your cooling fan motor starting to fail....

When you turn on the heat you are removing some of the heat from the system.
If your cooling fan is starting to fail the temperature will spike, then come back down when it starts working again.

Be sure to check for leaks,,,,,or the cap on the coolant holding tank for tightness.

There is plenty of information on this board for overheating.. common problem.

 

[St. Lou-LS]

its gotta be your cooling fan i has the exact same thing happen to me on my 02 and took it to the dealer and they repleaced the cooling fan and no problems since

 

[lseguy]

Most common overheating issue on the LS is air in the system. I first suggest bleeding your cooling system by the book/procedures/thoroughly.

In my experience, when the engine temp is starting to rise above normal, the fan kicks into a very high speed mode and makes a louder roaring sound. This does NOT necessarily indicate a bad fan. It's the fan trying to help out more. As soon as I would see the needle begin to rise above the halfway point, I would turn the heat on full blast..highest temp setting/highest fan setting. After experimentation, I would only need to leave it on this setting for maybe 20 seconds. This appeared to be enough for the coolant to temporarily "burp" itself past the air bubble, and allow the coolant to begin to once again flow freely through the system.

Once I bled the system, the issue did not re-occur. Why air got into the cooling system in the first place, is beyond me. But based on everything I've read here, it appears to be not uncommon for bleeding of the cooling system to be required once every 3 years or so. (not to mention the fact that the coolant should be flushed every 1-2 years anyways)

 

[WS6HUMMER]

This is a common problem, search the board for overheating, it is probably your cooling fan motor starting to fail....

When you turn on the heat you are removing some of the heat from the system.
If your cooling fan is starting to fail the temperature will spike, then come back down when it starts working again.

Be sure to check for leaks,,,,,or the cap on the coolant holding tank for tightness.

There is plenty of information on this board for overheating.. common problem.

I agree, I had the same symptoms of over heating. The car actually is just thinking its over heating. I did a search and the majority of everyone was replacing the degas bottle so thats what I did, performed the air bleeding procedure and havent had a problem since. That was about 7 months ago.

 

[pektel]

Mine was overheating intermittentlyfor a couple months before i took it in. Mine was a cylinder head temp sensor. Cheap part, but sufficient surgery to open her up. The bad sensor was reading 60 Degrees cooler than the other. Replaced the sensor, no more problems...