Normal Operating Temp [Archive] - Forum


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03-02-2007, 07:39 PM
Is this normal for a 3400 V6 2002 Grand AM GT....

around 215....

If so how can I get that to run lower. Sorry for the newbishness.

PS sorry if the picture is to big.

I heard if I put a 180 degress T-Stat it should lower it. Is it really neccasary. Oh by the way I just changed my intake seals, got a new water pump, new coolant resovoir, and new radiator hoses.

Mike Jung
03-02-2007, 07:44 PM
Yes, that is normal.

The stock thermostat is 195F/91C.

The cooling fans for the engine coolant come on:
The PCM commands Low Speed Fans ON under the following conditions:

The engine coolant temperature exceeds approximately 106C (223F).
The A/C refrigerant pressure exceeds 1310 kPa (190 psi).
The vehicle is shut off when the engine coolant temperature is greater than 140C (284F) and system voltage is more than 12 volts. The fans will stay ON for approximately 3 minutes.

The PCM commands High Speed Fans on under the following conditions:

The engine coolant temperature reaches 110C (230F).
The A/C refrigerant pressure exceeds 1655 kPa (240 psi).
When certain DTCs set.

You can try to flush & change the engine coolant.
Change the thermostat.
Run a synthetic motor oil (see:
Use a PF-52 oil filter instead of PF-47.
Get a DHP PCM or reprogram the stock cooling fan settings with a "tuner" software progam.

03-02-2007, 07:53 PM
my car always runs 185-190....but i have a DHP,180 dilled tstat, and royal purple purple ice

Mike Jung
03-02-2007, 08:09 PM
...I heard if I put a 180 degress T-Stat it should lower it. Is it really neccasary...
Changing your thermostat to a 180F/82F is not going to do too much.

Yes, your thermostat will open at 180F.
But if you sit in traffic (or it is really hot out), your cooling fans (to cool the engine coolant) still won't come on until the stock settings anyways.

03-02-2007, 09:28 PM
^ word.....the only reason why my car runs so cool is the stuff i did...i dig it

03-02-2007, 09:50 PM
mine is stock and stays right on 200

03-02-2007, 10:19 PM
Its normal. You can either live with it or pay money to do something to it. The 180 t-stat will help but its intended purpose is to help reduce knock retard which robs the engine of power during hi-temp hi-load situations. If the temp bugs you get the t-stat and get a tune.

Mike Jung
03-02-2007, 10:40 PM
mine is stock and stays right on 200
Mine sits at 1-line below 90C/194F (middle of gauge on my Canadian version GA) normally during highway cruising in the summer.
But climbs when I hit traffic or stop.

Now in the winter:
It sits 2-3 lines below 90C/194F (middle marker)

I have a stock temp (195F/91C) fail-safe thermostat.

PS: (German) Castrol Syntec 0W-30 synthetic motor oil FTW :D

03-03-2007, 09:46 AM
Yeah, thats a pretty normal temp. You can also drill some extra holes in the thermostat for extra flow, just don't go overboard with it. Also you can add some redline waterwetter or similar product in your coolant (do a drain and fill for even distribution). They do typically lower the temps 5-15 degrees. Other than that, try any of the things Mike listed. Also make sure you've got all the air bled out of the system.

03-03-2007, 09:47 AM
caspers fan switch.