Question about 1997 Ford Escort

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Where is it and how do i test wires on heater..

It's get cold and dark need help now

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  • yadayada
    yadayada May 11, 2010

    what wires? to what componet? testing will not fix any problem, just let u know what it is that needs to be replaced, do u understand that?

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Motor is situated under the plastic scuttle panel beneath the windowscreen. The bonnet needs to be open to access it. Just bridge the wires to test the motor.

Posted on Dec 13, 2008

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Jan 13, 2011 | Chevrolet S 10 Cars & Trucks

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Your car's heater is a life saver in cold weather. Before attempting to repair your car heater, you should understand how your heater system works. First, on this page is an explanation of how the car heater system functions, further down the page are some pointers on heater system trouble-shooting. To warm the passenger cabin of your car, the heating system makes use of excess heat from the engine internal combustion process. A car's engine, in fact, when in operation produces so much excess heat that if the excess heat is not removed, it would destroy the engine. It is your car's cooling system that removes that dangerous excess heat. Some of the excess heat is released through the exhaust. Most of the excess heat is absorbed by a circulating liquid coolant, which is a mix of water and antifreeze. The heated liquid coolant is carried from the engine through hoses to the radiator, which transfers the heat from the coolant to the outside air. That heat transfer lowers the temperature of the liquid coolant, which is then circulated back to the engine to absorb excess heat again. Whereas the radiator is located at the car front grill, the unit that transfers heat to the passenger cabin is located inside the dashboard. This unit is something of a mini-radiator and is referred to as the heater core. Heated liquid coolant circulates through tubes in the heater core and a heater fan blowing across those tubes, as well as through little fins encasing the tubes, directs warm air through heating vents into the passenger cabin. Because your car's heating system works off of its cooling system, heating system malfunctions are often caused by problems in the cooling system. The heater core in your car is similar to the radiator in the front of your car; in fact it looks like a small radiator. The difference is the heater is mounted inside the car and air is blown through the fins of the core. The heater hoses transfer engine coolant from the engine to the heater core, this allows the heat from the engine coolant to be utilized and warm the passenger compartment. When a heater stops functioning determine what type of failure has occurred to execute a repair. We have listed the most common problems below:
heater_core.jpg
Heater Core
Troubleshooting Procedure
  • Step 1: Check Engine Coolant Level - Most cars have coolant reservoirs with opaque white plastic tanks and measuring lines allowing you to see if the coolant is at the recommended level. Coolant expands when heated, and for that reason, most coolant reservoirs have a Full-Cold and a Full-Hot line. If there is too little coolant in the reservoir, you should be alerted to the possibility that there could be a leak somewhere in your car's cooling system. Remove the reservoir cap and add coolant to the Full-Cold line, if a very short time after you refill the coolant reservoir the coolant level is low, there is a leak in your car's cooling system. Engine coolant is used to heat the heater core and if the vehicle is low on coolant the heater core will stop working. The heater cannot produce heat due to the lack of heat from the engine coolant. Even if the engine is not over heating the coolant level can still be low. Inspect the engine coolant level in the coolant reservoir tank; coolant level should be between the hot and cold marks. Always check the coolant level when the vehicle is cold, preferably over night. Check for engine coolant leaks and repair as needed, then refill with coolant and recheck the system.
    radiator_cap.jpg
    Radiator Cap
  • Step 2: Inspect Heater Control Valve - The heater control valve is used to shut off hot coolant from entering the core when the heater is in the off position. A heater control valve can be actuated by either a vacuum line or a cable from the vacuum heater control valve to the heater core. This hose should be warm; if not the heater control valve is stuck and needs to be replaced. After the repair has been made refill the coolant level and recheck system.
    heater_control_valve.jpg
    Heater Control Valve
  • Step 3: Check Vacuum Feed - Most heater systems are operated by engine vacuum. This vacuum is used to actuate servos to move the temperature adjustment doors inside the heater plenum. If engine vacuum is not present the heater will not operate properly. To test for this condition remove the vacuum feed line from one of the vacuum servos. With the vacuum feed line removed insert a vacuum test gauge. If no vacuum is present, open the hood and inspect all small vacuum lines from the engine to the firewall and repair as needed. If a hissing noise is present under the dash when the engine is running a vacuum leak exists and must be repaired to restore heater function.
  • Trouble Shoot Heater/Air Conditioner Blower Motor. An electrical motor is used to push air through the heater and air conditioner system. If this electric motor fails it will not force air through the system. Ground a test light lead to a good ground source, like a metal brace under the dash, seat mount bolt or under hood brace. Turn the key to the on position; check the fuse in the heater or blower motor fuse panel with a test light. Then lightly touch the service port at the top of the fuse on both sides. If the test light illuminates on both sides of the fuse, the fuse is ok and working properly. If the fuse lights the test light on one side it is blown and needs to be replaced. fuse_panel.jpg
    Power Distribution Center
    If you are unsure of the location of the heater fuse consult a repair manual. If the fuse condition is ok, position the blower speed to the highest setting. Connect the ground end of the test light to a known ground source. Then probe both ground and power feed wires of the fan motor. The test light should illuminate on only one of the wires (fan motor failed). If the test light illuminates on both wires the ground source has shorted. If neither of the wires illuminate the power source is shorted. To trouble shoot this style of problem a wiring schematic is needed.

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1 Answer

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check your ignition switch, it is possible that is worn and when is cold it does not make good contact.
to check use a test light, with ignition off and cold trace the power wires to the switch, then turn the ignition on and check the other wires for power if there is no power you need a new switch. about $40 and 30 min to replace.

Jan 14, 2010 | 1992 Dodge Dakota

1 Answer

Hot air wont work .The cold air works but the warm air will not .i have checked the thermostat it is not that


how dark is your coolant look at the reservoir bottle if your coolant is real dark. there is a good chance that your heater core is plugged the coolant breaks down and causes the heater core to plug. If you raise your idle and the heat gets slightly better good chance it is that. also your water pump could also be failing hope this helps. good luck.

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1 Answer

Heater fans are not working


chrysler to test find the ect....electronic cooling temperatute sensor a two wire sensor neer thermastat housing.. unplug it and with in a couple seconds fan should come on if they do replace sensor oem only.. if still not come on do they come on when ac on.... big problems with pcm....power train control module... main computer.. but cost alot of money so need to be sure......color of wires to ect are dark blue with dark green stripe second wire is violet with orange stripe....get back if not fix for more info

Sep 04, 2009 | 2005 Dodge Caravan

1 Answer

1999 jeep grand cherokee laredo 4.0 litre 6cyl automatic cooling fan does not come on to cool engine, causing overheating of the engine.


OK here we go you will need a test light for the following tests, i will try to be as descriptive as possible so lets get started

fist start the engine and turn on the a/c that should command the fan on.
right front engine compartment next to the battery is the power distribution center pop off the top, ground your test light to the negative battery terminal and find fuse number 10 it is a 40 amp fuse check both sides of this fuse with your test light, if you have power on both sides of the fuse than we shall go further.

unplug the connector from the cooling fan, there should be two wires in the plug one is dark green and the other is black with a pink tracer, with your test lite grounded to the negative battery terminal check the dark green wire for power, if there is power there than move your test light ground clamp to the battery positive terminal and test the black wire for ground,
if testing the black wire made the test light shine than the ground circuit is good, if it did not than check you ground connection behind the right headlight.
when testing the dark green wire, if the dark green wire made the test light shine and the ground circuit is good than you simply have a bad coolant fan motor.

I suspect you were not getting power to the fan motor so you will need to take a look at the radiator fan relay, this is a special solid state relay mounted to the inside of radiator core support on the right side down behind the bumper.

here you will find a single plug with 4 wires in it

black = ground
dark blue / pink = relay controll from pcm
dark green = output to radiator cooling fan
gray = battery power from fuse # 10 in pdc

unplug the relay ground your test light to the battery negative terminal, with the engine running and a/c turned on check the gray wire the test light, it should turn on if not recheck fuses.

move your test light to the battery posistive terminal and test the dark blue / pink wire, if the test light turns on than you have a bad radiator fan relay, you can pick one up at your local parts store for about $85.00 just make sure you get a high quality one the cheap ones have a hard time with the amprege consumption of that fan.

good luck

wesley schacht@hotmail.com

Jun 14, 2009 | 1999 Jeep Grand Cherokee

2 Answers

1995 grand prix


do you have a test light?your speaker wires should be four sets of matching color,dark/light blue,dark/light green,dark/light purple and one other matching set of colors. then there should be one black wire which should be ground.with a test light you can find your power and accesory wires. your power wire will always have power with key on or off,the acc wire will only have power when key on. i hope this will help.

Aug 04, 2008 | 1995 Pontiac Grand Prix

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