hot air coming out of defroster side vent with nothing on.

Asked by Jul 04, 2016 at 12:32 PM about the 1999 Toyota 4Runner 4 Dr SR5 4WD SUV

Question type: Maintenance & Repair

The driver's defrost vent discharge is warm to hot with all temp/heater/AC
/fan controls off. Most noticeable when starting to drive somewhere. Also,
the radiator is very hot with minimal distance traveled (less that 1/4 mile).
The water pump, thermostat and timing belt was recently replaced. The
vehicle has 180,000 + miles on it.. The issue did not exist before repair work
was accomplished. Any ideas?

1 Answer


Make sure their is no air trapped in the system impeding coolant flow. Google how to bleed air out of cooling system. You can also pick up a test kit most auto parts shops that will test for hydrocarbons in the coolant, which is an indicator for head gasket issues. (Napa has a product called "block tester" for that).

Your Answer

Toyota 4Runner Experts

  • #1
    Kurt Burton
  • #2
  • #3
View All

Related Models For Sale

Used Toyota Tacoma
452 Great Deals out of 41,046 listings starting at $2,600
Used Toyota Tundra
550 Great Deals out of 37,345 listings starting at $1,500
Used Jeep Grand Cherokee
835 Great Deals out of 73,542 listings starting at $950
Used Chevrolet Tahoe
646 Great Deals out of 37,897 listings starting at $695
Used Toyota RAV4
506 Great Deals out of 66,352 listings starting at $1,995
Used Toyota Land Cruiser
13 Great Deals out of 1,072 listings starting at $4,000
Used Ford F-150
2,535 Great Deals out of 221,934 listings starting at $1,222
Used Ford Explorer
878 Great Deals out of 64,708 listings starting at $1,200
Used Toyota Camry
853 Great Deals out of 72,897 listings starting at $1,400
Used Nissan Pathfinder
324 Great Deals out of 22,286 listings starting at $1,988

Used Cars For Sale

2018 Toyota 4Runner For Sale
5 Great Deals out of 18,700 listings starting at $32,590
2017 Toyota 4Runner For Sale
29 Great Deals out of 1,955 listings starting at $24,000
2016 Toyota 4Runner For Sale
34 Great Deals out of 2,043 listings starting at $22,991
2015 Toyota 4Runner For Sale
44 Great Deals out of 1,545 listings starting at $20,988
2014 Toyota 4Runner For Sale
23 Great Deals out of 894 listings starting at $17,997

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.