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you have leaves or a mouse nest in the hvac fan, the fan is a squirrel cage type and is out of balance because of debris in it, you can remove it pretty easily by removing the screws under the dash and it will drop down and you can clean out the debris
Hello, the heater core is a small heat exchanger located inside the truck,
similar to the radiator at the front of the truck. Coolant is
circulated from the engine through the heater core and back to the
engine. The heater fan blows fresh, outside air through the heater
core; the air is heated and sent on to the interior of the truck. For
Toyota Pick-ups/Land Cruiser/4Runner 1989-1996 check this reference
repair guide...
Heater Core - REMOVAL & INSTALLATION (see Figure 1)
Drain the cooling system.
Remove the heater unit assembly. Have a lot of towels handy for the leakage of coolant that may spill into your interior.
Remove the fasteners securing the core to the unit, remove the plates and clamps. Pull upwards to remove the core from the unit.
To install:
Inspect the core fins for any blockage. Using compressed air, clean them.
Install the core into the unit placing the plates and clamps into position. Tighten the core screws.
the blower motor is located under the dash on the passenger side below the glove box. remove the 3 gold color screws with a flathead screwdriver or an 8mm socket and ratchet. there is also one electrical connector. this will allow the blower motor to drop down and you will most likely find a mouse or other debri. hope this helps
You have some type of foreign material in the fan. Under the dash, on the passenger side, locate the fan motor. Remove the electical plug, and the 3 screws that holds the fan motor onto the housing; drop the fan straight down, after removing the 3 screws. Clean out the debris, and reinstall the fan. Easy to do.
There is a valve on one of the heater hoses that allows heated water to flow through the heater core when you select heat. With heat selected and car warmed up check to see if both of the hoses feel warm. If not then water is not flowing through heater core and valve may need replaced or heater core is stopped up.
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