Question about 1999 Toyota Camry

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Fan speeds The AC/vent fan on my 1999 camry stopped working on all speeds except high and off, is this a relay problem? something I might be able to fix my self?

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  • longreen Jun 11, 2008

    It's a manual control

  • Marty marty May 11, 2010

    2 different types...is it auto climate control or manual? I have both schematics.

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  • Master
  • 883 Answers

fan speeds - 5186b7b.tif
Not sure if image posting is working now...I have the schematic, just hard to post it now...I'll try again tomorrow

Posted on Jun 11, 2008

  • Marty marty Jun 12, 2008


    look for Blower resistor (on blower housing)...sorry if not very readable. please rate me solved! thanks!


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2005 equinox ac fan only works at low speed. I just had it flushed and coolant added last year


There are two relays for the fans. One is a low speed relay and the other is a high speed relay. There are also fuses for the fans high speed and low. Take the cover off or the under hood fuse box and on the inside of the cover it will give a diagram of the fuses and relays. Try swapping the relays with something else and see if the fans go to high when you turn on the A/C as it always should. Sound like a bad High Speed Fan Relay to me but check it out.

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I have 91 Toyota camry & just recently my fan blower on works on high, the medium and low functions don't work. Is there something wrong with my fan blower?


No.

Probably not. If it runs on high, it is probably good.
Unless is sounds slow or 'tight' on high, or squeaks or chips , etc. Run the fan with the engine off and then shut the fan off and listen and see if you can hear how long it takes to slow down. If it stops in just a second or two, the bearings are tight (dry). If it spins down normally, maybe three to eight seconds or more, the motor is fine. You really don't need this check.

It is most likely your blower relay.
Most cars have one or two relays to control the fan motor, which is a single speed motor that the relays and speed switch and blower resistor control the power to.

One relay is for high speed, also switch contact.
One relay is for other speeds and divert current through a blower resistor located by the fan duct under the dash or under the hiid by the fan.
Also the switch contacts for each speed.

It cad be the dash switch, which has to handle the blower resistor current for all the lower speeds is burned out at those speeds.
It can be the low speed blower relay, as I mention above, is burned out, this is most frequent cause.
it can be the blower resistor is burned out, this can give no low speeds, or loose speeds below a certain speed setting.

Try you manual for the blower relays' positions. Try swapping with the horn relay to test if it is the same type of relay.
Take out the blower resistor carefully (pretend you are defusing a bomb or playing "operation" game as it has exposed coils that are delicate and if you bump the sides of the opening as you extract it you will damage it and short the coils against each other). the wire coils are very fine bare wire coils that look like springs and if touching can burn out.
Switch is harder to test because hard to get at, check the other things first.
You should be able to test for voltages at the resistor plug to see if power is coming from the switch, but wiring schemes can vary.
Post back or use shop manual to troubleshoot the switch.

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1 Answer

I have a 1991 Buick Park avenue with 44,000 miles that is not blowing air through the vents. I just put a brand new resistor in and that changed nothing. The fan spins at a low speed when the car is turned...


Switch the relay with one of the other relays to make sure that this relay is good then go to the HVAC control programer which is behind the floor vent (middle). The Blk/gray wire is the one that supports the relay coming out of the HVAC programmer, but there is a chance that this programmer is bad. If that proves to be the case, I may even have one...let me know.

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Check your thermostat and your water pump belt your radiator could also be clogged.

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1 Answer

At first the ac stopped cooling. then the car overheated with the ac off. there appears to be no loss of radiator coolant


Turn your engine on with the A/C on high. Watch your cooling fans mounted behind the radiator to make sure they are running. If they're not running, you have something wrong in the electrical side of the fan system. The cooling fans are essential for cooling as they pull air through the radiator when the vehicle is not moving fast enough to cool the coolant. The problem probably lies in a relay, so replace the high speed fan relay with one you know works but is not essential for moment (rear window defrost or something similar) and put that in the relay spot for the high speed fans. If the fans kick on now, you need to replace your relay and this will probably also fix your overheating.

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1 Answer

My radiator fans both have stopped working


Could be a few things. If your fans were just working then just stopped, it could be the fan motor. It could also be the relay. If you know where your lo speed and high speed cooling fan relays are located, you can eliminate this step easily. Take a known working relay (rear defrost or something not essential for starting) and replace the fan relay with the known operational relay while your engine is running and A/C is turned on. If the fans start, there's your problem, if not, then it's probably your fan motors.
Make sure the fuse that protects the fan speed relays is not blown as well.

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1 Answer

I'm trying to find out how many cooling fan relays are in a 1999 Ford Taurus SE with the 3.0L Vulcan OHV engine. This model year has done away with the CCRM (Constant Control Relay Module), so the relays...


fuse #9 protects the 2 cooling fan relays.

It looks like the hgh speed cooling fan realy is in a thin box mounted sideways between the battery and fender.

It has high speed relay, autolamp relay, autolamp headlamp relay, horn relay, washer motor relay, wiper hi/lo relay, wiper park relay.

Section 03-03: Engine Cooling 1999 Taurus, Sable Workshop Manual
DESCRIPTION AND OPERATION Electrical System NOTE: With A/C ON, the cooling fan motors will run continuously. Cooling fan motors will not cycle ON and OFF with A/C clutch (2884) .

NOTE: An exception to this is when vehicle speed is over 61 km/h (38 mph) and coolant temperature is below 100°C (212°F), and A/C head pressure is below 1.71 MPA (250 psi). The cooling fan motors will then automatically shut off.

The cooling fan motors are mounted within a fan shroud (8146) behind the radiator (8005) .

Engine Cooling Fan Control CCRM Applications The PCM monitors certain parameters (such as engine coolant temperature, vehicle speed, A/C on/off status, A/C pressure, etc) to determine engine cooling fan needs. The PCM controls the fan operation through the Fan Control (FC) output (single speed fan applications) or the Low Fan Control (LFC) and High Fan Control (HFC) outputs as shown in Table 2. Although the fan control (FC), low speed fan control and high speed fan control relays are normally open relays, the FC/LFC circuit is wired through a voltage inverter inside the CCRM. The voltage inverter ensures that the PCM must turn on (ground) the FC/LFC output to turn the fan off. This is done so the cooling fan will operate in the event of an open FC/LFC circuit.

Stand-Alone Fan Control Relay Applications The PCM monitors certain parameters (such as engine coolant temperature, vehicle speed, A/C on/off status, A/C pressure, etc) to determine engine cooling fan needs. The PCM determines engine cooling fan control requirements and controls the fan operation through the Low Fan Control (LFC) and High Fan Control (HFC) outputs (Table 3).

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