[Engine temp hotter with new mechman 320 billet unit....]

I've also seen them overheat in the lanes before a 1/4 mile run. Sounds great, I guess I figured proper maintenance was regularly performed on the vehicle in the first place.

Any extra load at idle and extra heat from the Alt has the potential to cause the cooling system to work harder

Glad the problem is resolved

-Nick

[Engine temp hotter with new mechman 320 billet unit....]

The engine is working harder to drive the alternator. It will heat up a little more, but shouldn't get past the thermostat temp. If it's a tuned engine, additional cooling upgrades might be required

-Nick

really? holy shit then i should remove mine

its going to work a bit harder but nothing noticeable. 15hp at best and that includes from the stock so maybe 5hp more than stock. the alt is not the issue. could be that you pay more attention to the gauges now that the new alt is in. or could be that the thermostat and water pump are giving out and you are thinking thats the cause.. im running the 370a and notice no cooling difference. heck, there are guys here with 2 alts even some with 4 and they have no cooling issues

Well he's running a 5.0 Mustang. It's a perfomance oriented car, without the greatest cooling system. It's reasonable to guess there could be a few parts on the engine as well. So please forgo the sarcasm as i'm actually trying to give some possible advise. Yeah, You can run 4 alternators on a SUV that is meant to tow and has a great cooling system. So just stop, and just try and give this guy good advise. Please leave the sarcasm out.

-Nick

[Engine temp hotter with new mechman 320 billet unit....]

The engine is working harder to drive the alternator. It will heat up a little more, but shouldn't get past the thermostat temp. If it's a tuned engine, additional cooling upgrades might be required

-Nick