blmustang01

With AC off, cylinder head temps spikes to 210-219 F. With AC on the fan kicks in and keeps the cylinder head temps at 199-205 almost the entire time I'm driving. I've never seen above 219 F on my car. Does it matter to keep the temps down? What are your temps?

SpartaPerformance

Do you know what they are supposed to run at? Cooler doesn't mean its better if the non AC temps are in specified range.

blmustang01

Owner manual states nothing about what temps are acceptable but it stays at 2005-2007 mostly.

Dino Dino Bambino

It's not unusual (and my name isn't Tom Jones . If the AC is off, the electric fan is only going to switch on in low speed mode at a predetermined temp. If you're idling in slow traffic while the fan is still off, the coolant (and cylinder head) temp. could spike that high for a few seconds.

dj2014

^^^^^^What Dino said^^^^^^

jz78817

the cylinder heads are the hottest part of the engine. 210 or so is fine.

blmustang01

Cool thanks. I think it would take tremendous heat to warp the cylinder heads, maybe above 260 F is the breaking point. I just hate seeing it spike then try to get to 2007 where it mainly idles at.

leomccoy1313

I usually my 2008 V6 mustang at 600 degrees. Unless I put coolant in it, I usually dont because I like it to heat up really quick because its cold in Northern California.

Dino Dino Bambino

The issue with cylinder head warpage or the head gasket blowing from an engine overheat is more likely when you have an aluminum head on an iron block (dissimilar metals expanding at different rates).
Aluminum dissipates heat faster than iron and thus aluminum engines run more efficiently at a slightly higher temp.

Looks like I have company with another comedian in the house .

blmustang01

Lol, for a second I thought you were serious.