hizzo3

Ok so Friday night I am out with my girl and she asks "Is your car overheating?" I saw an old ass pickup in front so I thought it was him. Just as precaution I flip my DIC over to the coolant temp, and its sitting at 225!!! needless to say she was right.. Stopped at the first gas station, checked all the fuses, nothing seemed out of place. Just to be certain, I swapped the A/C relay with the fan relays to see if it was bad. No dice. A/C worked just fine after each swap (fan1 & fan2). But oddly I noted the fan came on when I flipped on the A/C. I figured the fuse pulling reset the ECM. Ran home, picked up my laptop so I can have HP Tuners with me to manually control the fan if needed. We went on with our night. I did have to manually turn the fan on, either with A/C or by HP Tuners. It seems that both low and high work just fine, but are not being triggered by the temperature. Any ideas?

Coblasts

The ECM commands Low Speed Fans ON under the following conditions:

• Engine coolant temperature (ECT) exceeds approximately 106°C (223°F).

• A/C refrigerant pressure exceeds 1 310 kPa (190 psi).

• After the vehicle is shut off, the ECT at key-off is greater than 140°C (284°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.

The ECM commands High Speed Fans ON under the following conditions:

• ECT reaches 110°C (230°F).

• A/C refrigerant pressure exceeds 1 655 kPa (240 psi).

• When certain DTCs set

If the car is overheating pematurly check the cap for the surge tank is on tight(if on tight have it pressure checked),reduced pressure in the cooling system causes the coolant to boil over at a lesser temp.
I think you would have a coolant system pressure problem,(15 psi is the norm to raise coolant boiling temps)

hizzo3

I may be confused here... I thought 220+ was bad. It was only 70 degrees outside. Previously, it would turn on low at around 190 and high at about 205. Running the 2.4 if that makes any difference. I didn't see any signs of boiling over. no steam, no surge tank fluctuations. Reason I assumed it was over heating was the 'hot' smell coming from an engine. Kinda like hot rubber ect.

Coblasts

Sure the smell wasnt coming from your brakes.

Tomtwtwtw

Proper coolant / water mix @ 15 psi will not boil until over 260 degrees, so in that sense 230 is nothing to worry about. You're not damaging you car at all. If idling for a while, the temp may get that high before the fans bring it down. But if you're seeing 220-230 while cruising at speed, then you should get it looked at.

BlackSS2.4Sedan

i'm having the same problem with mines. it gets 205 F. 2.4 as will. the fans haven't turned on and i havent traveled far on it either. A little scared it might over heat. What seems to be the problem?

Tomtwtwtw

See post above yours.