I recently put a 86,000mi 4.6 in my 02 150. At the same time i did electric fans and an evolution. I was wondering if someone could tell me what there Coolant reads on there edge with the A/C on?? I think mine is gettingway to hot. Thanks.

 

How hot is it getting?
Under normal conditions it should not be much more than 195 as that is (should be) when the thermostat opens up. I don't think I've seen mine over 200 yet with the scangauge. If this is at highway speeds, the fan probably should not be kicking on anyway with so much airflow. If it's getting excessively warm you may have a bad thermostat or a plugged up radiator or something else going on.

 

Depending on the weather, mine runs between 192 and 198.

 

190 to 198 max temps i've seen

 

Try reading CHT pid. The ECT is just a derivative of the CHT in 04-08 trucks. I can't remember if the 02's have a coolant sender unit. I know yours is a 02. 196 is what the highest mine has been but haven't had any hot weather yet.

 

I just had the radiator out and i cleaned it off real good. I havent had any problems with it since then. If it were a thermostat why would it only do it with the A/C on?? The temp normally stays around 194-198 ive never really seen get past there unless im really in the throttle but it would go right back down it wouldnt stay up above that.

When i had my A/C running it got to 210 and i shut down the A/C and it cooled right down, That was going down the highway.

 

The fan doesn't control the coolant temp, the thermostat does.

 

210 is not really too hot for the coolant, especially, if you have the A/C on, which is blowing HOT air on the radiator.

However - 88racing points up the REAL thing you should be looking at. Monitor the CHT. The ECT is only "inferred" from the CHT. You never can see the actual ECT in these trucks. My CHT tends to be in the 200 degree region, and I've seen it up to about 214 under VERY heavy load (with the AC on).

- Jack

 

Just to add to what you are saying Jack, Troyer told us a long time ago that these engines are most efficient, power wise at around 210.

 

Thanks, Bluejay, and good point! I think most all automotive engines are now designed to run in this temperature range.

Bluejay, I know you know this, but I'll put it out for anyone who might not - Your cooling system contains antifreeze not only to keep it from freezing, but to raise the boiling point. In addition, the system is pressurized, which raises the boiling point even higher. A properly maintained cooling system can generally get to about 250 degrees before there is danger of boiling. And, our trucks go into failsafe mode when the cylinder head temperature reaches 258 degrees.

So, a coolant temperature above 200 degrees when the engine is under load is really ok. It's designed for this.

- Jack

 

Thanks For all the information. I have tried to get my temps up again but the weather has been to cold for that. Hopefully when the hot weather hits my truck wont over heat.

I have now changed my display to have the ECT, and the CHT temps. I will just have to keep my eye on them.