1999 celica vvti 140 bhp.it has manual heater controls, the fan works ok on low but when i turn it to a higher speed it somtimes cuts out all together other times its ok. if i leave it on low it seems to be ok. i have changed the ressistor that sits behind the fan but it has made no difference can anyone help me please. thanks
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Re: heater blower works intermitantly
If you have access to a DC voltmeter; try this:
Check for voltage on each of the heater resistor terminals, when it is unplugged, key in the on position. With the heater switch on low, you should have 3 volts DC, on lo-med, 6 VDC, hi-med, 9 VDC and on hi, 12 vdc. It looks to me like you might have a bad heater switrch, if the voltages do not match exactly what is posted above, or vary when you slightly manipulate the switch, the switch contacts are bad. Hope this helps. If not, please repost for additinal info.
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sounds like blower bearings are dried out and will eventually lock up the blower..sometimes you can spray wd40 in the blower bearings and it will work fine for a while.. also check vacuum controls to the baffle dors in the ductwork..may have some leaks there.. should hear a slight hissing if really bad..repost findings
once engine is hot
all cabin setting set to heat
check hoses going into cabin from engine - are they hot if not check - engine thermostat.
flush cabin heater core with water from garden hose - through both core hoses one direction then the other - to clean out core.
check vacuum doors in heater core box in passenger compartment.
All cars are designed with a blower fan motor that pushes air through the ventilation system. This air is processed by a series of vents to direct the air to various positions. Example: heater, air conditioner and defrost modes. Most blower motors are power by a basic electrical circuit that utilizes a multi resistor or a solid-state resistor to control different fan speed modes (low, medium low, medium and high). If the resistor malfunctions it may lose one or more of the lower fan speed settings.
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It could be your blower switch, but more than likely it's a resistor that is usually a part of the blower assembly, and it operates the speeds. Doesn't cost much but can be tricky installing. If you had one or two speeds not working, initially, eventually all may stop. If fan stopped working and all speeds had been operating, then you may have a bad wire or blower motor. Also, check your manual for fuses, as there may be a compartment inside the vehicle as well as one under the hood.
Check the blower resistor pack - usually located in the heater air ducting in the blower fan airflow. Check for loose connections and open circuit resistors on the unit.
If speed 4 works always, its unlikely to be the blower motor ground connection.