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Thank you! Very informative and helpful post. I'm checking this today.

one has a 3.3L, the other a 3.8L. Both 1999

Not exactly true. Efficiency will suffer on a linear basis along with rising heat, but you most certainly can get AC operation without the fan running (until the refrigerant pressure transducer trips the AC clutch cut off point) So before the refrigerant gets hot, you can still get ice cold...

see post above.

What mechanism ensures that? Are you absolutely certain that applies to all vehicles? Reason I say this is I have two identical Gen3 Chrysler minivans. Both have outstanding ice cold AC. Neither of them exhibit that behavior (the fans on neither come on when the motor is cold with the AC on.)...

Correct. Basically the system is working as designed. It's my preference to change it somewhat. Why? Because ALL environmental and personal factors cannot possibly ALL be accounted for with one cooling system design. I happen to live where it never gets below freezing and is often over 100F...

I "think" I found the best solution. An aftermarket, adjustable 160F - 240F fan control system. That way I can manually set the On/OFF temps that I want.

Well, it's a new sensor and I'm using OBDII to get the reading. But I guess anything is still possible. Thanks

:ROFLMAO:

Thanks. Lot's of helpful advice. I find it odd that some people with the exact same vehicle (year and model), same type radiator (and not even as new as mine), report they "Never" see temps above 212F? That does not jibe with the Factory service Manual for that particular vehicle as the fans...

What about at 200F? 205F? 210F? If it doesn't FULLY open until 238F then changing it to open earlier couldn't hurt it seems. That's what I'm getting at. That said, the consensus is that it won't make any difference and basically, I believe that to be true

Lot's of good, helpful info. Preciate all the replies 🍺

You could put the entire Bible in your OP.....and someone would say still you left something out. Life.....Internet. In all these responses, I still haven't learned if thermostats do indeed open gradually or all at once. Now that I think about it....I once put a thermostat in boiling water and...

Not doubting or arguing.....just trying to absorb info.

Google is not always your friend....aka...you can get ANY answer you endorse if you keep searching (right or wrong) That said, I see many posts on the internet saying that thermostats are not EITHER FULLY OPEN or FULLY CLOSED instantly. What I'm reading instead is that a thermostat BEGINS to...

True or false.....Coolant system pressure has the greatest effect on boiling point ? I ask a lot of question because I like good opinions or facts. sometimes hard to know the difference without lots of asking.

millerbl00...... The horror stories on new vehicles just keep piling up. Now paint peeling off in sheets. Seems the manufacturers are all in a race to the bottom to see who can build the cheapest vehicle for the highest price. Then they all but make it impossible for you to do a darn thing to...

True, but since the fans are designed to come ON at that temp, then it seems the factory agrees with my perception? Ideally, I would like to see the temps stay below 215F at ALL times. I have seen it reach 228F a few times. That's getting uncomfortable close to 260F IMO, where head gasket...

I read that most thermostats open PARTIALLY at their set temperature and won't FULLY open until 10F - 15F higher than the set temp. I figured if that was the case, going to a lower set point would also lower the temp at which it is fully open?

One is a 3.3L and the other a 3.8L. Both Gen3, 1999