I just had the brake fluid and oil changed in my 2002 F-150 at a chain oil and lube shop. Now, my heater a/c fan doesn't respond to the switch. It comes on and goes off intermittently. I am thinking it is responding to changes in engine vacuum as I accelerate and brake. Did the lube guys break something?

Asked by Feb 03, 2015 at 12:52 PM about the 2002 Ford F-150 Lariat Crew Cab SB

Question type: Maintenance & Repair

2002 F-150. I had the oil and brake fluid changed at a chain shop. After, I now have a
problem that did not exist before. The fan for heater and a/c does not respond to the
switch. If the fan is on max, it blows full on then stops, then will blow full on. If the fan
is set at a lower speed, it does the same, blows, then stops, then blows, then stops. I
am associating the change with changes in engine vacuum as I accelerate or let off
the gas and/or brake.  I replaced the control head for a/c, heater, fan just over a year
ago at a Ford dealer so I know the control unit is good.

1 Answer

16,255

The fan doesn't run off vacuum. The vent selection may but the fan is electric. Sounds like a loose connection

Your Answer

Add photo

Related Questions

  • Check engine light comes on when accelerating 14 answers

    In my 90 f150 when I accelerate the check engine light comes on. when I ease off the acc. the light turns off. any Ideas?

    1990 Ford F-150 XLT Lariat Extended Cab SB

    -

    Maintenance & Repair

  • On my 2011 f 150 the daytime dash llights will not turn off after key is removed and doors locked. How do I fix this as it runs down my battery 117 answers

    Started with a dead battery and then boosted it off and ran fine. Noticed when i parked it at end of day the day time dash lights were still on several hours after I pulled key and locked it.

    2011 Ford F-150 Lariat Limited SuperCrew

    -

    Maintenance & Repair

  • intermittent discharge 66 answers

    Recently i started to suspect my starter was going out acting like it's got a dead spot etc. Then on a 2 hour trip to des moines the other day i noticed i was only showing about a 10 A charge (wipers ...

    1996 Ford F-150

    -

    Maintenance & Repair

  • Something wrong with acceleration? 3 answers

    I have a '92 Ford F150 XLT supercab that ran nearly perfectly when I bought it (for very cheap.) My dad figured the fuel filter needed replacing (Why? no idea) so we did that and the front fuel tank...

    1992 Ford F-150

    -

    Maintenance & Repair

  • I have a 1978 F-150, Value? 34 answers

    I have a 1978 F-150 Ranger 4x4. Short bed, Trailer Special.Step bumper,Receiver hitch. Factory lockout hubs,351m 4v New Holley carb,Edelbrock intake.C6,PS,PB, Factory air. Original interior in excelle...

    1978 Ford F-150

    -

    Shopping & Pricing

Search Ford F-150 Questions

Ford F-150 Experts

#1 OJ
OJ
Reputation 6,300
#2 dandyoun
dandyoun
Reputation 3,980
#3 tennisshoes
tennisshoes
Reputation 2,400
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,729 Great Deals out of 150,184 listings starting at $1,259
Used GMC Sierra 1500
1,189 Great Deals out of 58,894 listings starting at $2,499
Used Dodge Ram 1500
536 Great Deals out of 13,008 listings starting at $1,200
Used Ford F-250 Super Duty
455 Great Deals out of 43,210 listings starting at $2,850
Used Toyota Tundra
709 Great Deals out of 28,881 listings starting at $2,500
Used Toyota Tacoma
773 Great Deals out of 34,326 listings starting at $2,988
Used Ford Mustang
718 Great Deals out of 39,272 listings starting at $1,995
Used Ford Explorer
1,479 Great Deals out of 74,562 listings starting at $985
Used Chevrolet Tahoe
1,073 Great Deals out of 31,900 listings starting at $1,700
Used Ford Ranger
219 Great Deals out of 7,085 listings starting at $1,500
Used Chevrolet Silverado 2500HD
375 Great Deals out of 28,619 listings starting at $2,295

Used Cars For Sale

2017 Ford F-150 For Sale
44,232 listings starting at $17,605
2016 Ford F-150 For Sale
213 Great Deals out of 93,828 listings starting at $17,937
2015 Ford F-150 For Sale
272 Great Deals out of 8,386 listings starting at $18,891
2014 Ford F-150 For Sale
583 Great Deals out of 11,522 listings starting at $9,600
2013 Ford F-150 For Sale
815 Great Deals out of 14,812 listings starting at $7,527