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What is the little black box on the condenser fan next to the plug

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The relay

Posted on Aug 06, 2010


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Land cruiser 2007 condenser fan does not come on when ac switched on

Check to see if you are getting power to the fan motor. Do this by shutting off the car and then disconnecting the cannon plug to the condenser fan. Start the car and turn on the AC. Take the plug end from the car and test for power with a simple voltmeter or trouble light circuit tester. If you have power then you have a bad AC condenser fan. If you don't have power you probably have a bad relay. Check the relays in the fuse box under the hood. If the compressor does not run it can be a bad relay or a very low Freon charge. Good Luck.

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What causes both cooling fans to not run?

Hi Naomi , there is a lot involved in the control of the cooling fans on your vehicle ! There are three fuse's , three relays an a fan control unit !
1. radiator fan main relay , located in underhood relay box A
2.condenser fan relay , located in underhood relay box A
3.radiator fan relay , located in underhood relay box C
4.Cooling fan fuse # 47 20amp. underhood fuse / relay box
5.condenser fan fuse # 50 20amp in underhood fuse / relay box.
Any one of these could cause them to not work, rather then just replacing parts an wasting money you should take it to the repair shop !

Apr 06, 2015 | 1997 Acura RL

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The drain line is plugged on my 2007 corolla lwhere is the drain hose?

What drain hose? If it is for the AC, in the engine compartment on the passenger side, the is a black plastic box on the firewall where the AC / heater blower fan is. At the bottom of this box is the drain hose. The box houses the AC evaporator and when the AC is running, water condenses on the evaporator and is drained through the hose.

Jul 04, 2011 | 2007 Toyota Corolla

1 Answer

My dodge 1995 intrepid will run but the fan does not kick on to cool the engine.once i stop the engine has to cool to restart.Problem is...

This is a common problem. Usually, the fan's RELAY has went bad. This relay can usually be found under the hood, somewhere in the engine compartment.
The relay is just a switch, and is activated by the engines temperature sensor.
It is just a pull-out, and plug back in little black box. usually, it is well labeled, and easy to find. it will be in a box, with a lid, and when you remove the lid, there should be several large fuses, and some little black boxes that usually say BOSCH 30A on them.

If you change the relay, and your fan still does not work properly, then the problem may be the temperature sensor on the engine, the wiring, or the fan itself may have went bad.
But, start with the relay switch, as it is the most likely culprit.

Good Luck.

Jun 20, 2011 | 1995 Dodge Intrepid

2 Answers

Installed B18 used engine now the radiator fan won't come on

If you used the sensors that came on the used engine, replace the coolant tempertur sensor. this should fix your fans

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2002 camry 4 cyc - water in the ac condenser does not drain. Can it be unplugged? How to I get to the condenser?

Hello. Welcome to FixYa. Please allow us to assist you.

The AC condensate drain is accessible from the passenger side of the car. Move the front pass seat back, and pull down the carpeting next to the console and under the dash. You are looking for a black rubber hose, that comes from the bottom of a black plastic box, and then exits thru the firewall. Having a container (a coffee can, or something similar), remove the black hose form the plastic box, and catch the trapped water. After the water stops draining, pull the black rubber hose towards you, and flush out the blockage with a stream of water. Refit the hose and you will be good to go.

Thanks for choosing FIxYa for assistance today.
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Sep 30, 2010 | 2003 Toyota Camry

3 Answers

Where is the radiator fan fuse?

under hood fuse/relay box - #13 7.5 AMP fuse, controles Power mirrors, ABS system, Air delivery, Blower motor relay, Rear window defogger relay, Radiator fan relay, Condenser fan relay

#13 is top row of fuses 3rd from left side.

Radiator Fan Relay located right Rear Corner of Engine Compartment
3 black relays in a row, radiator fan relay 1st one on left side of box

Feb 10, 2010 | 1994 Honda Civic

1 Answer

Heater fan wont shut off when i put the fuse back in it takes about to minutes to come up on hi could it be the resister

underneath passenger side controls setting how fast yes its resistor.good luck right next to blower fan black box with harness plug and a coil

Feb 07, 2010 | 2003 GMC Sierra

2 Answers


jtaddiken: A/C systems rely on air flow over the condensers and is the component that looks like a radiator. This component is also located in front of the radiator while the fan is behind the radiator. Consequently if it does not function, especially on hot days the pressures in the condenser will build. The condenser is where the freon is condensed from a gas to a liquid. The byproduct is HEAT!
SO, You could have a number of problems occurring. 1. Fuses: in the main fusible link box are located on the left side of the engine compartment. It's a large black box about a foot long and 4 inches wide.When you remove the cover, you will see some fuses with clear plastic tops on them. They will have numbers on them.
The top fuse will have 140 the next two spaces down should be empty. Then there should be a 30, 30, 30, 50, 40, 40, 30.
You want to check the 30 which is the first one in the line as you go down from the 140. Look through the clear plastic top and compare it to the other ones. if the center of it is burned or missing, it is no good.
Pull it out and get a replacement with the same number.
IF it blows again, you have an electrical short which you can either chase down or bring to a professional.
2. Relays: There should be another box or an arrangement with 4 relays. Three will run side by side and one will be at the other end of the box. Based on the schematic I am looking at, they all work in conjunction with each other. The only variable is the condenser fan. But the radiator fan is designed to run whether the A/C is turned on or not. A failure of any one of these will render the condenser fan inoperative.
3. The fan motor has failed. You can do a simple test which you might do before you do check #2. That is, unplug the fan motor and supply it with an external power supply. Both the positive and negative. The negative is supplied through the relay and the other side to the fan is hot all the time.If the motor runs then continue with the other tests, if it doesn't , the motor is bad.
4. The pressure switch. If the pressure switch has failed, it will create an open circuit to the relay that also kills the compressor clutch so the A/C stops cooling. It can be located on the receiver drier or on the high pressure line close to the drier.
One which malfunctions can also keep the Condenser fan from running.
5. An A/C condenser with a lot of debris built up on it. There is significantly more air being forced through the condenser coils than the fan can pull through the radiator, air leaks between the radiator and condenser, thus minimizing the suction through the condenser.
I hope I haven't created a confusing situation rather than a plausible solution. I try to not only solve the problems, but give a basic understanding of how it works and then why it may not work.
Sometimes people will grade me on my assistance. Most of the assistance I have given, has not yielded a "well he helped" OR BOY, this guy should be giving advise in loading rocks!"
Any way, if I have helped and you need further assistance, I would be delighted to assist. Good Luck.

May 06, 2009 | 2002 Toyota Highlander

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