My truck has always been consistent on its "warm" tempurature. Just barely under the Halfway mark on the temp gauge. Within the last week I've notice that during lunch when I sit in my truck for 30 min or so with the AC on the temp will start rising at a fairly rapid pace. At that point I found I could either turn the truck off or go for a drive around the block and it'll cool down to normal temps.
I'm thinking it may be the fan clutch. But another off symptom has me confused. If I turn the blower on (wether it be face, floor, or face and floor) it blows as cold as if I had turned the AC on.

Any insight?

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2006 DSG FX4 SuperCab 4.0L SOHC V6, 5R55E, vinyl floor boards 31" AXT's on DSG Alcoa's. Cranked T-bars to level.

"Education is what you get when you read the fine print...Experience is what you get when you don't."

Thermostat

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mine was stuck closed. It would get hot with or without the AC. but much faster with the ac on. Eventually causing my radiator to crack.

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its a Ranger

I've got no issues with it running warm though during any amount of normal driving. Only happens when I'm sitting still.

The thermostat has also been replaced since its original purchase. The PO lived in Arizona and put a lower temp thermostat in to compensate for the heat. The truck also has less than 100k miles. That's why I was thinking the thermostat was still okay.

Any way to test the thermostat to see if it is good or not?

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2006 DSG FX4 SuperCab 4.0L SOHC V6, 5R55E, vinyl floor boards 31" AXT's on DSG Alcoa's. Cranked T-bars to level.

"Education is what you get when you read the fine print...Experience is what you get when you don't."

Ok,

next would be coolant level?
or check to see if the fans are engaging with the ac on.

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its a Ranger

Coolant level is good and fan works as it should. I'm gonna check if the coolant is any good next. Can't remember the last time I've had a radiator flush and I've never had to add coolant. Thinking between sitting in direct sunlight and potentially "sour" coolant may just be too much of a load on my coolant system. Will do a flush while I'm at it.

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2006 DSG FX4 SuperCab 4.0L SOHC V6, 5R55E, vinyl floor boards 31" AXT's on DSG Alcoa's. Cranked T-bars to level.

"Education is what you get when you read the fine print...Experience is what you get when you don't."

I ran into this one other time on a Ranger and it was a bad radiator.

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1999 Ranger 4.0 and extreme Snap-on tool fetish

Verify that there is no obstruction in the airflow through the A/C condenser and the radiator. Flush very thoroughly with water if need be.

PO apparently had a problem and thought that inserting the wrong thermostat would cure it. Predictably, that move was wrong. Remove the incorrect part for the application and install the correct Motorcraft t-stat (for reliable results, accept no other brand). BTW, engine also get's best mileage running at the temperature it was designed to run at.

You could and ideally should verify what the real engine temp is when it is running by using the torque app, an Ultra Gauge or the like, or an IR thermometer. The point is, prove that it's actually overheating by determining what the actual coolant temp is. Those dash gauges are generally relative and their performance is not much to get excited about.

Edit: I've had debris build up between the radiator and the A/C condenser and to remove it, the radiator needed to be removed or maybe, if lucky, you could loosen it at the top and push it back, vacuum in there, etc. You can't see this crud until you gain acess to that area between the two, but it can nicely obstruct airflow and cause it to run warm/hot.

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2004 Ranger FX4 Level II, 5R55E, Sonic Blue Pearl

Proudly JAP/RICE free since March 2000

Yeah I would start with a flush of the radiator and look over it for cracks or loose hoses.

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its a Ranger