Okay, now that it is finally gettting a little cooler here and I don't need to run the A/C constantly, I'm noticing more power and responsiveness from my truck and I like it.

I thought only the smaller engine cars got bogged down. A friend said he noticed no differences, anybody out there notice the difference?

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99 F250XLT Supercab LD
5.4L 3.73 LS
White/Silver
Graphite interior
6 CD changer/Captain's Chairs

 

Only a very slight difference in mine.

 

When the compressor is on, any vehicle has power robbed to some extent. I can definately feel a difference in mine.

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2000 F-150 XL, RC, LB, 5.4L, 4R70W, 3.55LS,
Class III tow, Payload #3, & Convenience pkgs.,
4-wheel disc/ABS, Chestnut/Parchment 40/60,
Ford bedliner w/Paintsaver & gas/wheel/spare locks,
K&N F.I.P.K. w/Outwears pre-filter, Superchip,
Dynomax ultra-flow welded 3" cat-back w/ 3" Y-pipe,
Hellwig front & rear anti-sway bars, Rancho RS 9000s,
Mobil 1, K&N oil filter.

 

I can also feel a small loss with a/c on, but it is nothing compared to a 4cly Nissan I used to have. It felt like the power was cut in half with a/c on.

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'99 F-150 XLT SC 4x4 5.4L Auto 3.55LS Tow pkg, skid plates, keyless entry, UWS tool box, Superchip, Gibson pipes w/ Flowmaster 40 series muffler, K&N filter, BFG 265/75/16 All-Terrain TA/KO

 

The only truck I have not seen a difference in is a f350

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'97 F-150 XLT Clearcoat Red
4x2
17 inch Wheels
Stepside, K&N, bedliner
32inch tires,flowmaster,
tint, matching ford sticker
5spd fully loaded, hidden hitch
new spark plugs

 

Performance gains could be the result of cooler air temps. There are only two settings (panel & floor) that do not run the a/c compressor. All others cause the compressor to cycle just like a/c.

 

so you are saying that defrost runs the a/c compressor?



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'97 F-150 XLT Clearcoat Red
4x2
17 inch Wheels
Stepside, K&N, bedliner
32inch tires,flowmaster,
tint, matching ford sticker
5spd fully loaded, hidden hitch
new spark plugs

 

Yep, compressor runs with defrost, it helps to keep the windows defogged. It makes a heck of a difference in the effectiveness of the defrost setting.

LHM

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2000 F-150 Super Cab XLT 4x4 ORP 5.4liter V8, Towing Package, Rear Slider, Remote keyless Entry,3.55 LS, Black Exterior, Medium Graphite interior, manual shift 4x4. Current mods Gooseneck hitch,Ford Custom Molded Splash Guards, Muth Signal Mirrors, SUPERCHIPS Performance Chip, Line-X Bedliner, STROBES!!and Y pipe with duals.

 

Yes. It has been that way for decades. Not only does it help with clearing the windows, it also keeps the compressor lubricated for longer life.