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Old 08-11-2010, 02:03 AM   #21
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i was told by someone who knows stuff that the car would die if it hit 260* temperature, that'* all. perhaps he was confused, or perhaps he was right?
That may be true for other cars, especially those with aluminum engines. The nature of the iron 3800 lends it to be a little more forgiving in these matters. The engine should be running cooler than 235 while idling and A/C running. Keep in mind that when the A/C is on, the fans are on high all the time, and usually while idling, it will be running right up against the thermostat. Something is wrong. The car should only hit 235 when you are beating the crap out of it <mountain roads, serious towing, etc>. With that being said, 235 is hot, but is not a big deal for these engines, however they will only get that hot with good reason. Find out why it is getting so hot, and fix it before it gets you in trouble.

You may wish to start with something simple, such as checking between the A/C condenser, and the radiator. It is known for collecting crap in there. Coolant system flush may be in order too.

And fans kick on high with no A/C at 225 normally.
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Old 08-11-2010, 02:55 AM   #22
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That may be true for other cars, especially those with aluminum engines. The nature of the iron 3800 lends it to be a little more forgiving in these matters. The engine should be running cooler than 235 while idling and A/C running. Keep in mind that when the A/C is on, the fans are on high all the time, and usually while idling, it will be running right up against the thermostat. Something is wrong. The car should only hit 235 when you are beating the crap out of it <mountain roads, serious towing, etc>. With that being said, 235 is hot, but is not a big deal for these engines, however they will only get that hot with good reason. Find out why it is getting so hot, and fix it before it gets you in trouble.

You may wish to start with something simple, such as checking between the A/C condenser, and the radiator. It is known for collecting crap in there. Coolant system flush may be in order too.

And fans kick on high with no A/C at 225 normally.
Correct me if I'm wrong, but IIRC, only the secondary (and less powerful) fan is on while the A/C is on on 3800 powered cars, and the primary fan only turns on at a specific cutoff, which is either 230 or 235 degrees F. Someone should be able to confirm this.

Also, IIRC, with the A/C off, the secondary fan only turns on at some point above 235 near the red line. If the primary fan alone cannot cool the motor with A/C off, then there is something seriously wrong.

But do consider that with A/C, only one fan will turn on, the scondary. This fan motor is smaller and weaker than the primary fan motor. With the condenser generating a significant amount of heat and no air moving through the radiator except the heat being pulled from the condenser through the radiator by one fan, I can definitely believe that with a 90+ degree outside temperature, one'* car would have difficulty cooling itself properly without the use of the primary fan. If when both fans turn on the temperature does not drop down to 195, then thre is definitely something wrong, but I don't remember both fans turning on when the A/C comes on.
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