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180 thermostat or leave stock?

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Old 07-26-2011, 10:23 PM   #1
BLKSTANGER
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Default 180 thermostat or leave stock?

Ok Stock 97 GT no real problems but runs a little warm on hot days. Gauge reads just past half way when hot but when running 20 miles on the freeway on a 90*+ day and I park it i can hear some bubbling noise from the radiator. My hot rod mind from yester year tells me to flush it out real good and throw in a 180 stat. I don't have a tuner to reset the fan settings. Am I going to have any problems being the stat doesn't match the fan settings or will it just not be up to optimum cooling performance?
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Old 07-26-2011, 10:30 PM   #2
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Leave it alone.

First, you don't know the actual temp from the stock gauge. Anything short of the red zone really is OK.

Second, EFI is designed to run at higher engine temps to maximize combustion efficiency. 200-215 is very much the designed temp. 220-230 on a warm day is no big deal. Unless you are redesigning the fuel strategy for a particular reason around a lower temp, there is no reason to deviate from stock. You might even cause it to move out of the optimum range and adversely affect power or mileage.
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Old 07-26-2011, 10:36 PM   #3
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So I shouldn't be concerned hearing a little boiling going on when I park it? It that normal for these engines?
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Old 07-26-2011, 10:39 PM   #4
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I am going to flush it as it's due. Should I use some purple ice in it?
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Old 07-26-2011, 10:57 PM   #5
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IDKWTF he's talking about but SN95's do fine with the 180* stat. have one in mine, had one in the 95, and everyone else i know has one i theirs too... and they all run better than the stocker... guess we all got lucky?...

anything less doesnt let the ECU get out of "warm up" mode and THAT will hurt your power and mpg, but otherwise a little cooler is a GOOD idea...

just an FYI never take advice from S197 guys, they only pretend to be Mustang guys...
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Old 07-26-2011, 11:00 PM   #6
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flush the system first then see how it runs, then we can go from there.
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Old 07-26-2011, 11:07 PM   #7
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Thanks, My thinking is even with the 180 stat it's still going to run 190* around here. It's in the 100*s all summer. Pulling the stat will make the flush a little easier too. So I figured why not change it out while im there.
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Old 07-27-2011, 02:12 AM   #8
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Quote:
Originally Posted by sn95_331_GT_ yellow View Post
just an FYI never take advice from S197 guys, they only pretend to be Mustang guys...
HAHAHA i love it!!!
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Old 07-28-2011, 09:32 AM   #9
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I run a 180° T-stat here in Florida, both to keep the engine a bit cooler on flaming hot days and to let me run a bit more aggressive ignition timing (1° to 2°).

I did alter the fan speeds however that is not 100% necessary, all that will happen is that the coolant temperature will rise a bit more, from the steady state achieved with adequate radiator air flow, when the fan is needed than it would with the on/off speeds reduced in the tune. At a drag strip this would perhaps be an issue while staging/otherwise waiting, but for a DD it really doen't matter...
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Old 07-28-2011, 06:21 PM   #10
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Thanks cliffyk. You confirmed my thoughts on the subject. I drive this car 95% on the freeway and never get stuck in any traffic.
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Old 07-28-2011, 06:34 PM   #11
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I learned a long time ago to never say never; as never is a very long time.

Nonetheless, as the fan settings in the stock tune will not allow the engine to burn up it is not as I said above an absolute necessity to lower them--it does remain however the correct way of doing things if you wish to take full advantage of the lower temperature thermostat...
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Old 07-28-2011, 09:53 PM   #12
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so cliff, you're saying w/ the 180 degree t-stat you lowered the temperature for which the fan will turn on, or did you raise the kick on temperature??
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Old 07-28-2011, 10:28 PM   #13
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Quote:
Originally Posted by BLKSTANGER View Post
So I shouldn't be concerned hearing a little boiling going on when I park it? It that normal for these engines?
In my experience; that bubbling sound when you shut off the engine is the result of a coolant leak somwhere. It might be so minor that you can't see coolant seeping out but its a crack that allows air into the coolant system.

Check the pressure build up on your radiator hoses once the car is fully warmed up. If they are hard then you should be ok, but for me the bubbling sound was a cracked intake manifold.
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Old 07-28-2011, 10:47 PM   #14
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Quote:
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In my experience; that bubbling sound when you shut off the engine is the result of a coolant leak somwhere. It might be so minor that you can't see coolant seeping out but its a crack that allows air into the coolant system.

Check the pressure build up on your radiator hoses once the car is fully warmed up. If they are hard then you should be ok, but for me the bubbling sound was a cracked intake manifold.
I have a new intake on the car. The hoses are hard when warm. I found where the noise was coming from today. It's in the overflow tank. And it's more of a hissing sound from what i heard today. Very faint as I could barley hear it after a long run on the freeway. A new tank might be in my future. I screwed the cap on a little tighter and it stopped. I can't tell if it was the cap or it just happen to stop at the same time.
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Old 07-28-2011, 10:54 PM   #15
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Quote:
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so cliff, you're saying w/ the 180 degree t-stat you lowered the temperature for which the fan will turn on, or did you raise the kick on temperature??
I do not understand, it seems to be the same question asked from two differing perspectives?

That aside, I lowered all fan on/off scalars by 20°. Technically the difference is 30° but I found the fan ran too frequently and was annoying when I changed the values by that amount...
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Last edited by cliffyk; 07-29-2011 at 09:59 AM.
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Old 07-29-2011, 12:03 AM   #16
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i gotcha. i said it in a weird way, now that i look at it, but i was basically asking if you raised or lowered the fan turn on/off temperature. thanks for the input!
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Old 07-29-2011, 12:03 AM
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06, 180, 2000, 46, 46l, advantage, fan, gt, lower, mustang, onoff, performance, stock, temp, thermostat

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