Overheating

Tiny
RACHAEL SWITZER-HUBENAK
  • MEMBER
  • 2002 OLDSMOBILE AURORA
  • 3.5L
  • 6 CYL
  • AUTOMATIC
  • 83,000 MILES
I have an overheating problem. I have changed the water pump gaskets and reservoir cap and thermostat.

Saturday, September 26th, 2020 AT 2:50 PM

9 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
If the thermostat is new then we can assume that it is not the issue for now. The next thing to check is for restrictions and if the fans are turning on. When the engine is starting to get hot the fan should be on high so let's double check this and go from there.

https://www.2carpros.com/articles/engine-overheating-or-running-hot

To check for restrictions we need to use a temp meter around the engine to find out if there are hot spots.

https://www.2carpros.com/articles/how-to-use-an-infrared-temperature-meter

If there is a place that is hotter then the rest of the engine/cooling system them we may have a restriction there.

Let me know about this info and we can go from there. Thanks
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Saturday, September 26th, 2020 AT 3:31 PM
Tiny
RACHAEL SWITZER-HUBENAK
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Fans do work.
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Sunday, September 27th, 2020 AT 4:27 AM
Tiny
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Okay. That is good. So we need to check around the engine for restrictions including the radiator. It should progressively get cooler as you work your way down the radiator. If it is hot and then drops quickly then we may have a restriction there.
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Sunday, September 27th, 2020 AT 10:37 AM
Tiny
RACHAEL SWITZER-HUBENAK
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  • 5 POSTS
Nope, that's good. No problem with the radiator.
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Sunday, September 27th, 2020 AT 11:48 AM
Tiny
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Okay. How did you prove out the radiator is okay?

When does this overheat? Idling or do you have to drive?

Also, we need to check around the rest of the engine and cooling system for hot spots. Thanks
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Sunday, September 27th, 2020 AT 5:04 PM
Tiny
RACHAEL SWITZER-HUBENAK
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It gets hot while driving. What are the other hot spots?
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Monday, September 28th, 2020 AT 7:24 AM
Tiny
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You have to check around the engine with a laser temperature meter for the hot spots. There are no sure bets on that.

As for overheating when driving, that is most likely due to poor air flow like a plugged radiator not allowing air flow through it or a restriction within the cooling system. Like a collapsed hose or restriction inside the passages.
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Monday, September 28th, 2020 AT 6:27 PM
Tiny
RACHAEL SWITZER-HUBENAK
  • MEMBER
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How do you check for a collapsed hose?
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Tuesday, September 29th, 2020 AT 7:02 AM
Tiny
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The easiest way is to inspect them. If they are literally collapsed or sucked in then that is the easiest way. If they are not, you want to squeeze them as the engine is running and they should feel firm but you should be able to squeeze them and they "bounce" back. Basically if they are soft and don't feel like they returning to their normal size then they are collapsed.
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Tuesday, September 29th, 2020 AT 5:58 PM

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