Fan does not speed up when AC is on, is this could be the source of overheating problem?


Asked by Jul 31, 2016 at 04:28 PM about the 2006 Ford Explorer XLT V6 4WD

Question type: Maintenance & Repair

Hi, i have ford explorer 2006 4L XLT car and recently i noticed overheating
problem mainly on freeway with AC on. My mechanic changed the thermostat
and coolant but still i get the problem. I noticed the cooling fan turns on on
cold start and does not speed up when i turn the AC on, is this normal or how
does exactly this mechanism work?

3 Answers


Usually when a vehicle overheats at expressway speeds it's a coolant circulation problem, a collapsing lower radiator hose, or there's air trapped in the system. I'd suggest you flush out the cooling system with a chemical cleaner to get any rust and junk out of the cooling system. BUT be prepared for something to spring a leak. If you a weak spot in the radiator, water pump, heater core, etc. It may start leaking. HTH. -Jim


Thanks. However, the mechanic searched for a leak using pressure test and there were no leaks. I am concerned about the fan because I can not spin it freely when the engine shuts off. Also, the fan does not speed up when AC on max.

1 of 1 people found this helpful.

In a cooling system that's restricted by rust and junk you may not have a leak. But you will have poor heat exchange. The air-conditioning puts an added load on the cooling system which will exasperate the problem. When traveling at expressway speeds the fan(s) aren't even an issue. They're there for low speed and idling situations. If they're electric cooling fans you should be able to spin them by hand (with the engine off and COLD). If it's a clutch fan you may not be able to spin it by hand. HTH. -Jim

Best Answer Mark helpful

Your Answer


Looking for a Used Explorer in your area?

CarGurus has 64,280 nationwide Explorer listings starting at $1,200.


Ford Explorer Experts

  • #1
  • #2
    Tom Demyan
  • #3
View All

Related Models For Sale

Used Ford Expedition
428 Great Deals out of 19,938 listings starting at $2,500
Used Jeep Grand Cherokee
787 Great Deals out of 73,008 listings starting at $999
Used Chevrolet Tahoe
641 Great Deals out of 37,663 listings starting at $795
Used Ford F-150
2,488 Great Deals out of 220,740 listings starting at $1,222
Used GMC Acadia
570 Great Deals out of 38,146 listings starting at $3,500
Used Ford Edge
693 Great Deals out of 52,537 listings starting at $3,000
Used Dodge Durango
210 Great Deals out of 24,278 listings starting at $1,500
Used Toyota Highlander
441 Great Deals out of 44,104 listings starting at $1,750
Used Honda Pilot
433 Great Deals out of 38,674 listings starting at $999
Used Ford Escape
929 Great Deals out of 105,215 listings starting at $550
Used Toyota 4Runner
312 Great Deals out of 30,011 listings starting at $2,500
Used Nissan Pathfinder
304 Great Deals out of 21,963 listings starting at $1,495
Used GMC Yukon
369 Great Deals out of 18,592 listings starting at $1,800
Used Ford Explorer Sport Trac
46 Great Deals out of 1,653 listings starting at $1,650

Used Cars For Sale

2018 Ford Explorer For Sale
3 Great Deals out of 33,597 listings starting at $23,218
2017 Ford Explorer For Sale
122 Great Deals out of 8,156 listings starting at $17,495
2016 Ford Explorer For Sale
123 Great Deals out of 3,854 listings starting at $12,500
2015 Ford Explorer For Sale
318 Great Deals out of 6,888 listings starting at $9,500
2014 Ford Explorer For Sale
134 Great Deals out of 3,257 listings starting at $9,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.