2008 Explorer XLT - A/C air swaps to defrost when under strain

Asked by Oct 21, 2009 at 09:23 PM about the 2008 Ford Explorer XLT

Question type: Maintenance & Repair

My '08 Explorer has 60k miles on it. When driving under normal conditions with
the A/C on, the air blows normally from the console vents. When there are high
RPMs (such as climbing a hill or prolonged accelerating)the air swaps from the
front vents to the defrost vents. One repair shop claimed they repaired it
when they replaced a leaking vacuum hose, but it still occurs (though not as
often). There is no Haynes Repair Manual for the '08 model. I also cannot find
evidence the late model Explorers have a vacuum pump.

Any ideas on what I should look for? I can't find a schematic for the engine
(not in the owner's manual) so I'm pretty much at a loss.

5 Answers

12,135

I am assuming this is a 4.0 engine. What the manufacturer made to help elliviate this problem is a vacuum tank to hold vacuum under load conditons. Check to make sure all OTHER vaccum lines are conected properly and that they are not damaged going to this vacuum tank and that the vacuum tank did not get damaged by some previous "other" servicing. Good Luck

8 of 8 people found this helpful.
35

There should also be a one way valve on the vacuum line to the system, sometimes these stuff up and when under load, the vacuum drops and thus drops the vacuum in the aircon system too

3 of 3 people found this helpful.
12,135

John has a point - I do not think an 08 would be blocked but perhaps the previous repair shop removed it when it broke and did not reinstall one just 'teed' it all together ... I like this thought thanks John

I had a shop pull the reservoir off and test it. It held pressure without any leaks. An idea the shop had (and an expensive one) would be to pull the dash off and inspect for the problem that way. Any suggestions?

I replaced the check valve on the firewall. ($9,online). This solved the issue of AC air moving to defrost during heavy acceleration/towing on hills.

Your Answer

Explorer

Looking for a Used Explorer in your area?

CarGurus has 62,858 nationwide Explorer listings starting at $1,495.

ZIP:

Ford Explorer Experts

  • #1
    OJ
    Reputation
    10,780
  • #2
    Tom Demyan
    Reputation
    4,370
  • #3
    tennisshoes
    Reputation
    2,450
View All

Related Models For Sale

Used Jeep Grand Cherokee
869 Great Deals out of 70,866 listings starting at $995
Used Ford Expedition
364 Great Deals out of 21,635 listings starting at $1,500
Used Chevrolet Tahoe
635 Great Deals out of 36,921 listings starting at $1,800
Used Ford F-150
2,117 Great Deals out of 181,537 listings starting at $1,000
Used Ford Edge
800 Great Deals out of 48,104 listings starting at $2,900
Used GMC Acadia
678 Great Deals out of 45,760 listings starting at $3,500
Used Dodge Durango
270 Great Deals out of 20,209 listings starting at $999
Used Ford Escape
1,116 Great Deals out of 84,655 listings starting at $999
Used Toyota Highlander
450 Great Deals out of 24,811 listings starting at $2,299
Used Toyota 4Runner
248 Great Deals out of 21,419 listings starting at $2,300
Used Honda Pilot
414 Great Deals out of 25,384 listings starting at $1,400
Used Chevrolet Traverse
720 Great Deals out of 37,498 listings starting at $1,000
Used Nissan Pathfinder
294 Great Deals out of 23,866 listings starting at $2,500
Used GMC Yukon
425 Great Deals out of 20,897 listings starting at $2,000
Used Ford Explorer Sport Trac
61 Great Deals out of 1,803 listings starting at $1,500

Used Cars For Sale

2017 Ford Explorer XLT For Sale
8,843 listings starting at $25,076
2016 Ford Explorer XLT For Sale
441 listings starting at $18,991
2015 Ford Explorer XLT For Sale
31 Great Deals out of 1,234 listings starting at $15,995
2014 Ford Explorer XLT For Sale
50 Great Deals out of 1,278 listings starting at $11,990
2013 Ford Explorer XLT For Sale
14 Great Deals out of 616 listings starting at $12,440

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.