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

18,925

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).

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