Why does my A/C blower switch from vent to defrost when I accelerate?

Asked by frankp_eng Jan 22, 2015 at 02:32 PM about the 2001 Dodge RAM 1500 SLT LB RWD

Question type: Maintenance & Repair

I have a 2001 Dodge Ram 1500 with the V6. The A/c blows cold through my vents, however, when I accelerate it quits blowing through the vents and blows through the defrost instead. I have also discovered I have a heater core issue. My heater smells like antifreeze, steams up my windshield and does not heat very well at all. Could these two be related?

1 Answer

FordNut answered 9 years ago

At idle there is high vacuum in the intake, therefore in the vacuum system. When you accelerate, the vacuum drops and the diverter on the HVAC goes back to where it would be with a good vacuum source. Look for disconnected, cracked vacuum hoses up under dash. But I don't think the two issues are related, the odor is a leak in heater core, probably just a pin-hole but that's all it takes

2 people found this helpful.
Mark helpful

Your Answer:

Related Questions

Shortcuts

Search Dodge RAM 1500 Questions

CarGurus Experts

  • #1
    Dan Connell
    Reputation
    20,230
  • #2
    dandyoun
    Reputation
    15,280
  • #3
    Gene Arnett
    Reputation
    11,760
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford F-150
289 Great Deals out of 15,384 listings starting at $1,712
Used Chevrolet Silverado 1500
211 Great Deals out of 5,943 listings starting at $3,995
Used GMC Sierra 1500
127 Great Deals out of 6,857 listings starting at $3,975
Used Dodge RAM 2500
27 listings starting at $4,000
Used Toyota Tundra
50 Great Deals out of 1,126 listings starting at $5,999
Used Toyota Tacoma
55 Great Deals out of 1,032 listings starting at $8,708
Used Dodge Durango
51 Great Deals out of 2,276 listings starting at $5,500
Used Jeep Grand Cherokee
113 Great Deals out of 3,274 listings starting at $4,995
Used Chevrolet Silverado 2500HD
12 Great Deals out of 1,160 listings starting at $8,999
Used Jeep Wrangler
147 Great Deals out of 5,072 listings starting at $6,995
Used Ford F-250 Super Duty
29 Great Deals out of 1,154 listings starting at $8,995

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. Content will be removed if CarGurus becomes aware that it violates our policies.