180* T-stat running 195* - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-02-2003, 05:49 PM   #1
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Default 180* T-stat running 195*

I changed my T-stat to 180* but have a question. My temperature sending unit for the fans are made for 195* T-stat. This makes my temp gage go to 195* before the fans start cooling. There is no problem on the highway when you have sufficient air flow, runs at 180*, but in town I have no benefit of a 180* T-stat...my gage reads 200*. Does anyone have a part number for a 180* sending unit for the electric fans?
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Old 06-02-2003, 08:50 PM   #2
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Your ECT sensor tells the PCM what the coolant temps are. The PCM decides when to turn the fans on. You'd have to do an custom PCM burn to make them come on sooner, or 'trick' the ECT. This would cause an incorrect reading on your temp gauge.
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Old 06-02-2003, 09:16 PM   #3
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Quote:
I changed my T-stat to 180* but have a question. My temperature sending unit for the fans are made for 195* T-stat. This makes my temp gage go to 195* before the fans start cooling. There is no problem on the highway when you have sufficient air flow, runs at 180*, but in town I have no benefit of a 180* T-stat...my gage reads 200*. Does anyone have a part number for a 180* sending unit for the electric fans?
Yeah, I noticed that on mine and thought there was something I could do, but it'* okay since at night when it'* cool and I'm killin' some RICE I run 180.
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Old 06-02-2003, 10:35 PM   #4
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Well there are a couple other ways you can deal with this. You can do what I did and simply hard wire a switch with a 30amp relay to the two fans. When your stopped long enough to see a temperature difference you can turn them on. Best idea is to hook this to the 12v remote so it will automatically turn itself off when you turn your car off. The last thing you want is to leave your fans running while your shopping! The second, and best, idea is to get a Adjustable thermal switch. You can pick these up at a couple places, one is www.mawsolutions.com. Its not local (USA) but its one spot you can check with. You can use one of these to splice into your coolant temperature sensor and hook directly to your fans, disconnecting the stock fan harness so your computer can't turn them on and cause a short. They're adjustable so can be used on almost any application even if the voltage is different you might just have to set it to come on at 200deg to make up for the difference when really they'll come on at 190 or whatever. A little tuning might be needed. Good thing is since you didn't CUT the sensor out your temp gauge will still read correctly. Hope this helps
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Old 06-02-2003, 11:31 PM   #5
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Around town a cooler t-stat will make almost no difference. I could've told you that before you bought one. All a colder t-stat does is open sooner than the stock 195. So then the radiator is cooling the engine. The car can only be cooled to the limit of the radiator. When driving around town in stop and go traffic, the radiator doesn't get much cold air, so it can cool the engine sufficiently. Get a fan switch, and you will be all set.
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Old 06-03-2003, 01:16 AM   #6
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I have the 180* in my SLE and in town I might as well run a 195*. I say this becuase after about 2 minutes of stop-and go in town driving my temp guage is showing 220-230 and doesn't come down until I get out of town. my gas mileage sucks really bad in town too and then to back up those temps my charging system isn't the greatest. A new stock amp, a new heavy duty battery and with the headlights, ac on high, rear defrost on, and the radio on (volume turned down to 0 so no sound) and I am seeing red (9v).
With everything off I am lucky to hit 10.5-11.5v and that'* the way it has been since day 1.
I can tell it'* not my guage because with my high output headlights on and no other accessories on I can hardly see (yes they are properly aligned).
Out of town I run right in the proper 180* range, but that doesn't help my in town driving.
I am wondring how much I will gain performance wise once I find out what is causing the low volts (2nd battery and 2nd alternator and no change). There have been a couple times though where the volts were in the proper range (13-14v) and the car ran awesome and definitely was shoing it'* potential in the power category, but that'* only happened 2-3 times in the 10,xxx miles I've put on it.
Maybe for my temp I should swap the 180* t-stat out for a 160* t-stat and change the NGK TR-55 plugs for a set of TR-6'*.
I've checked and the fans are both running, but the low voltageslows them way down.

Stylez
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Old 06-03-2003, 01:58 AM   #7
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You've probably got a poor ground somewhere. Also check your voltage regulator it could be goin crazy
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Old 06-03-2003, 09:47 PM   #8
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I thought the voltage regulator was built into the alternator? If not where? In the PCM? In the BCM (not likely but possible)?
My brother said he was going to check the ground thing out the next time he'* in town (he'* an auto electrician and I'm not).
TIA,
Stylez
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Old 06-04-2003, 12:37 PM   #9
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Found an easy way to make sure your fan turns on before 195*. Turn your H-vac control to either defrost or A/C. This automaticaly turns the fan on no matter what your temp. When you're ready to hammer down some rice, turn it to off.
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Old 06-04-2003, 01:14 PM   #10
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Quote:
Originally Posted by DrJay
Well there are a couple other ways you can deal with this. You can do what I did and simply hard wire a switch with a 30amp relay to the two fans. When your stopped long enough to see a temperature difference you can turn them on. Best idea is to hook this to the 12v remote so it will automatically turn itself off when you turn your car off. The last thing you want is to leave your fans running while your shopping! The second, and best, idea is to get a Adjustable thermal switch. You can pick these up at a couple places, one is www.mawsolutions.com. Its not local (USA) but its one spot you can check with. You can use one of these to splice into your coolant temperature sensor and hook directly to your fans, disconnecting the stock fan harness so your computer can't turn them on and cause a short. They're adjustable so can be used on almost any application even if the voltage is different you might just have to set it to come on at 200deg to make up for the difference when really they'll come on at 190 or whatever. A little tuning might be needed. Good thing is since you didn't CUT the sensor out your temp gauge will still read correctly. Hope this helps
so do you want to tell us how we would go about doing this, cuz I got a 180 stat the other day and I plan on putting it in tonight, so if I can I'd like to know a little more about this situation
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