WHen a/c is running car kicks fan into hi gear. What causes this


Asked by Feb 16, 2014 at 05:44 PM about the 2007 Volkswagen Jetta 2.5L

Question type: Maintenance & Repair

2 Answers


Your fan should run when ac is on and car is at an idle or at low speeds.

Scott Sr.

When running the A/C, there is an increased fan RPM (caused by a relay) to create more airflow through the radiator and A/C condenser. It's the airflow that leeches heat away from the A/C coolant and engine antifreeze and ensures the continued proper function of both systems.

Your Answer

Add photo

Related Questions

  • Cooiling Fan and Heater 4 answers

    Background: I had no heat in my Jetta. but the temperature was running normal, right at 200 F. It did take what seemed like forever to warm up so I replaced my thermostat. Upon replacing my thermost...

    1995 Volkswagen Jetta GLS


    Maintenance & Repair

  • cooling fan 2 answers

    Think I need a new mechanic. Vw overheated and they diagnosed it as the aux or secondary water pump. I picked up my car when finished and 10 mins into the drive it over heated again! I then realiz...

    2003 Volkswagen Jetta GL 1.8T


    Maintenance & Repair

  • I have a 2013 vw jetta fan isn't turning? Help 4 answers

    Car was fine,than started overheating,fan isn't working can't afford costly repairneeda quickfix

    Volkswagen Jetta


    Maintenance & Repair

  • 2007 auxiliary cooling fan not working 4 answers

    Just picked up my Jetta from the dealership due to a power wire malfunction on the ECU ($564 repair). Upon pickup the mechanic said the auxiliary fan is not working and main fan is running slow. Nev...

    2007 Volkswagen Jetta 2.5L


    Maintenance & Repair

  • where is the relay located for the secondary cooling fan the one that delays and comes on when hot 1 answer

    my secondary fan that delays and comes on when hot is not coming on and causing the fluid to bubble out the radiator resevoir. the car isnt indicating that it is gettng hot other than needing to add f...

    2001 Volkswagen Passat GLX Wagon


    Maintenance & Repair

Search Volkswagen Jetta Questions

Volkswagen Jetta Experts

#1 FordNut
Reputation 2,110
#2 Goodwrench707
Reputation 1,870
#3 Tom Demyan
Tom Demyan
Reputation 1,270
View All

Related Models For Sale

Used Volkswagen Passat"
270 Great Deals out of 22,343 listings starting at $1,074
Used Volkswagen GTI"
102 Great Deals out of 6,093 listings starting at $2,900
Used Honda Civic"
1,183 Great Deals out of 58,586 listings starting at $1,295
Used Volkswagen Golf"
38 Great Deals out of 2,657 listings starting at $2,250
Used Honda Accord"
1,315 Great Deals out of 78,660 listings starting at $1,395
Used Toyota Corolla"
1,434 Great Deals out of 67,338 listings starting at $1,295
Used BMW 3 Series"
1,618 Great Deals out of 39,936 listings starting at $1,500
Used Audi A4"
342 Great Deals out of 13,069 listings starting at $1,500
Used Toyota Camry"
1,653 Great Deals out of 98,470 listings starting at $895
Used Nissan Altima"
1,483 Great Deals out of 87,903 listings starting at $1,195
Used Volkswagen Beetle"
250 Great Deals out of 9,197 listings starting at $1,500
Used Mazda MAZDA3"
476 Great Deals out of 24,993 listings starting at $1,788
Used Ford Focus"
1,214 Great Deals out of 57,459 listings starting at $1,495

Used Cars For Sale

2017 Volkswagen Jetta For Sale
12,702 listings starting at $13,099
2016 Volkswagen Jetta For Sale
26 Great Deals out of 2,484 listings starting at $11,749
2015 Volkswagen Jetta For Sale
102 Great Deals out of 3,927 listings starting at $9,700
2014 Volkswagen Jetta For Sale
119 Great Deals out of 2,653 listings starting at $5,977
2013 Volkswagen Jetta For Sale
233 Great Deals out of 3,939 listings starting at $3,000