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Re: Fan blows intermittently. Sometimes works, sometimes...
You need to replace the motor and resistor at the same time. The motor is not turning freely enough and will build up resistance in the wire and this will short out the resistor relay. I sold a lot of resistors working at a Isuzu dealer and if you did not replace the motor, the new resistor had no warranty on it. So if you just replace the resistor relay you will burn it up again.
Re: Fan blows intermittently. Sometimes works, sometimes...
The motor goes bad because leaves and such make their way down and clog
it's air intake. Pick up a new one at your local auto parts store if you have to.
It's four screws on the motor housing, located under the glove box (2 screws) and the wiring is harnessed, relay plugs in, so no sweat there.
While it's off, reach up into the cavity that feeds it air on the upper left.
may want to wear a glove. The design on this generation Rodeo is
horribly flawed. I pulled a squirrel-sized wad of rotten leaves and pine
needles from mine after replacing the motor and resistor twice.
Like drinking a milkshake through a coffee stirrer, you know that's bad
for a motor. I clean mine out every fall, before running the heat
non-stop all winter.
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Many of those type trucks have a fuel gauge issue...I don't think it is in relation to your heat and cool problem...I know people have had to change the complete fuel sending unit assembly to fix gauge...It wasn't cheap...Should have been a recall but it wasnt...However I don't have enough info for the heat/cool problem...Is the blower motor running all the time or does it not run until you drive for awhile..?..Some blower motors that go bad won't come on until they are jarred or tapped with a hammer...Maybe it is vibrated while driving and finally comes on...You have to listen closely to make sure if it comes on when you turn it on...If it always turns on when you flip the switch then it sounds that your HVAC blend vent doors are very slowly opening...This could mean the door actuators are wearing out or the plastic vent doors are contaminated at the hinge and slowly opening.......So check the blower motor operation first...If it don't blow until you drive the motor is going bad...First make sure all fuses have a good connection..sometimes they vibrate out...Also blower motor relays.If a blower motor relay is bad the blower will not come on at all....A faulty relay will not work the fan at all....If the blower motor comes on when it wants to it has to be a bad motor or improper connection....Sometimes a motor will operate but doesn't blow..This could mean the fan has torn loose from motor....Best way to troubleshoot blower motor is remove it,inspect fan connection...,hold it safely in your hand while an assistant turns it on.....Good luck..
The only way for you to use the heater system to cool the engine is by having the temp setting to highest setting and highest blower speed. That will then make your heater ocre a cooling device for the engine. When you turn on the a/c system, it does not cool the engine, and it shuts itself off whent he engine gets hot to protect the engine. That's when it blows warm air.
So check the fuse I talked about. and email me direct as I said. We need to run 12 volts from teh battery direct to the cooling fan. I will tell you how to make a test jumper to make sure the cooling fans work. You have 2 relays and 2 cooling fans, and I don't think they all quit at the same time. I think they are good. but testing will tell us
If the fan operates intermittently, but normally when running, it is less likely that the fan motor is the problem. More likely it is a failure in the power supply to the fan motor. If the fan motor was faulty it is much more likely to cease operation totally rather than to operate intermittently as you say it has been doing.
Without physically checking the operation myself it is hard to diagnose. However, there are at least 2 areas for checking:
1. The fan switching mechanism. Is your fan switch faulty and cutting power flow? As the problem is intermittent operate the switch a number of times to see if the symptoms repeat at a time the fan is operating for you.
2. The wiring. There could be a dodgy connection in the wiring to/from the fan motor which is intermittently cutting power flow to the fan motor. This will need to be carefully checked.
I would suggest you also contact your local toyota service department and talk to one of the experienced people there. Just suggest you are going to bring the vehicle in for service. <More often than not it is likely a number of owners will have come in with exactly the same problem as yours in which event they will be able to tell you what they diagnosed in previous cases. If you cannot get any useful info then contact another dealer.
You have a problem with the resistors on your blower motor. 95% of AC/Heater blower motors are located under the glove box in the passanger foot well. When you remove the motor you should see a resistor plate. Resistors are not servicable and will need to be replaced. This is a relatively cheap part, that you can replace yourself if your handy, if not take it to your local tech.
Most likely it does, if you can hit the motor and it will run. I can't say for sure but you might want to chk. to see if you got a heater blower motor resister. There located (if its got one) around the heater motor and it controls blower speeds, might be worth checking out.