Jul 092018
 

Ford Explorer

I turn my Air Conditioning on max, or any other setting and cold air comes out the main middle vent for about a minute. Then it quits and the air comes out of the defrost vents for a few minutes. And them it starts coming out of the main vent again for just a few minutes to the top and comes out of the defrost vents only. This cycle continues. What is the problem? Thanks for your time. Jeff Duty


The system is designed to divert to defrost when the control panel looses vacuum and this is usually caused by a vacuum leak in the supply line to the controller. Start by locating the vacuum reservoir under the dash on the passenger side and make sure the hose is connected and has good vacuum to it.
The reservoir is #2 in the diagram. If you find good vacuum at the reservoir and no leaks then the control panel will need to be remove and further testing done.

Air Conditioning vent problem

Vacuum Reservoir

2006-ford-explorer-vacuum-resivoir

Item Part Number Description
1 W701696 Vacuum reservoir screw
2 19A566 Vacuum reservoir
3 Vacuum connector (part of 18C581)
Removal and Installation
  1. Remove the vacuum reservoir screw.
  2. Remove the vacuum reservoir.
  3. Disconnect the vacuum connector.
  4. To install, reverse the removal procedure.
Jul 092018
 

GMC Envoy

Passlock Key No Start

I recently bought this 2002 GMC Envoy. It was sitting for around 6 months after the previous owner had a problem with it and couldn’t afford to fix it. My Envoy did not come with any sort of chipped key and the key I have will work in the ignition but not to unlock the doors. It cranks but won’t start. And the shifter locks and wont go into any gear. Is it the passkey security issue with it? I’ve check fuel pump and it’s working but no fuel at the fuel rail. So I’m figuring it’s got to be something to do with the security system. Is there a way to bypass that for now so I can at least get it started and check for it to run before spending all the money on a new passkey? Any hints or tips would sure help. Thank you very much.


Vehicle Theft Deterrent (VTD) Description and Operation

Passlock™ System

The Passlock™ System is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. If starting is attempted without authorization from the Passlock™ System, the powertrain control module (PCM) will disable engine starting. Start disable may be in the form of fuel disable or starter disable, depending on engine application.

The components of the Passlock™ System are as follows:

  • The ignition lock cylinder and key
  • Ignition lock cylinder case, including the Passlock™ sensor
  • The ignition switch
  • The body control module (BCM)
  • The security indicator on the instrument cluster
  • The powertrain control module (PCM)Ignition Lock Cylinder Case, Including the Passlock™ Sensor

The ignition lock cylinder fits inside the ignition lock cylinder case and operates the ignition switch when turned by a key with the proper mechanical cut. When the ignition key is used to turn the ignition lock cylinder to crank, start, a magnet on the lock cylinder passes close to the Passlock™ sensor within the ignition lock cylinder case. The magnet activates the security hall effect sensor in the Passlock™ sensor which completes a circuit from the security sensor signal circuit through a resistor to the security sensor low reference circuit. The resistance value will vary from vehicle to vehicle.

If a magnet from outside of the ignition lock cylinder case is used to attempt to steal the vehicle, the tamper hall effect sensor will be activated. This completes a circuit from the security sensor signal circuit through a tamper resistor to the security sensor low reference circuit bypassing the security resistor. If the ignition switch is forced to rotate without the correct key, or if the ignition lock cylinder is removed by force, the Passlock™ sensor will be damaged and will not operate.

Ignition Switch

The ignition switch contains the wiring and electrical switching portion of the column mounted ignition assembly. The switch includes wiring pigtails which connect it to the base of column connector, the Passlock™ sensor on the ignition lock cylinder case, and other components. The wiring for the Passlock™ sensor is unaffected by ignition switch position. The electrical switch portion is operated by the key and lock cylinder when they are rotated within the ignition lock cylinder case. The ignition switch operates the crank relay regardless of the status of the Passlock™ System.

Body Control Module (BCM)

The body control module (BCM) contains the logic of the Theft Deterrent System. The BCM provides the battery positive voltage to operate the Passlock™ sensor. The BCM also measures the voltage of the security sensor signal circuit. The voltage measured will indicate whether the Passlock™ sensor has been activated and whether the resistance value from the sensor is a valid value or the tamper value. If voltage measured is in the valid range, the BCM compares this voltage, voltage code, to a previously learned voltage code. If the voltage codes match, the BCM sends a class 2 message containing a password to the powertrain control module (PCM). When the voltage codes do not match, or the voltage is in the tamper range, or there is a circuit fault, the BCM will not send the correct password to the PCM, and the vehicle will not start.

Powertrain Control Module

The powertrain control module (PCM) contains the remainder of the logic of the Theft Deterrent System. If a class 2 message containing a valid password is received from the body control module (BCM), the PCM will continue to allow the fuel injectors to operate. The PCM will allow the fuel injectors to operate until it decides there is no valid password coming from the BCM. If the PCM does not receive a class 2 message, or receives a class 2 message with an incorrect password, the engine will crank and will not run or will start and stall immediately.

Theft System Indicator

The IPC illuminates the theft deterrent indicator as determined by the theft deterrent system. The IPC receives a class 2 message from the BCM requesting illumination.

  • The vehicle theft deterrent (VTD) system requests the IPC to illuminate the indicator only when the ignition switch is ON.
  • The content theft deterrent (CTD) system requests the IPC to illuminate the indicator only when the ignition switch is in the OFF or ACC positions or during RAP.
  • The body control module performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.

 

Fuel Lockout Cycle

When it receives a password which is incorrect or a password which indicates tamper and the powertrain control module (PCM) disables the fuel injectors, the fuel injectors remain disabled for 10 minutes even if the ignition switch is turned from the RUN position to the OFF position.

Changing the Passlock™ Components

The following components contain codes or passwords, or must learn codes or passwords for the Passlock™ System to allow the vehicle to start:

  • The ignition lock cylinder case
  • The body control module (BCM)
  • The powertrain control module (PCM)

If any of these parts are replaced, a learn procedure must be performed. Refer to Programming Theft Deterrent System Components . If parts are replaced and a learn procedure is not performed, the engine will crank and will not run or will start and stall immediately.

Jun 282018
 

Dodge Caravan

AC condensation is dripping into the passenger side floorboard.


This is an indication of a clogged evaporator drain plug in the air conditioning system. It is quite common for leaves and dirt to build up and clog this drain. When the drain becomes clogged the condensation builds until it leaks into the passenger floor. You may be able to just slip a screw driver up in the end of it and unclog it. This is easier to get to from underneath.

Ford Evaporator core drain plug location diagram
This a close up of what the tube looks like.
Drain Tube Evaporator core housing

Jun 272018
 

Chevy Impala

Car is overheating after replacing the radiator, radiator fans, water pump and thermostat. The is fan not working on the passenger side and ac blows hot on one side and cool on the other side.


It sounds like you have more than one problem going on. Neither problem is related to the other. One problem ids the engine overheating. The other problem is the AC blows hot in one side.

Overheating after replacing the radiator

This is pretty common after the cooling system has been worked on. Air is often trapped inside the system and needs to be bled out.

2001 Chevy Impala coolant system bleeding

(best viewed with Google Chrome)
2001-chevy-impala-draining-and-filling-cooling-system

AC blows hot on one side

This is very common of a failed blend door actuator. Replacing the failed actuator will take core of the air conditioning problem. The AC will blow cold out both sides once again.

Air Temperature Actuator Replacement – Left Side

Removal Procedure
  • Remove the left instrument panel insulator.
  • Remove the knee bolster bracket bracket.

2001-chevy-impala-actuator

  • Disconnect the electrical connector from the left air temperature actuator.
  • Remove the mounting screws from the left air temperature actuator.

2001-chevy-impala-actuator-removal-diagram-2

  • Remove the left air temperature actuator.
Installation Procedure
  • Position the left air temperature actuator, then align the slots in the electric actuator driver to the flats on the shaft.
  • Align the locating hole to the alignment pin on the HVAC module case.
  • Slide the actuator on the shaft. The actuator driver should seat completely on to the shaft and the mounting holes should be flush with the mounting screws on the HVAC module case.
  • Install the mounting screws to the left air temperature actuator.

Tighten
Tighten the left air temperature actuator screw to 1.5 N·m (13 lb in).

  • Connect the electrical connector to the left air temperature actuator.
  • Install the knee bolster bracket bracket.
  • Install the left instrument panel insulator.
Jun 182018
 

Jeep Commander

No start after radio replacement

My son replaced his radio yesterday and now the jeep will not crank. He has tested the battery, alternator, and starter. He has also checked the spark plugs. He replaced the ignition switch and the jeep seems like its trying to crank but it is not turning over. He is thinking this may be related to something electrical.


He, your son, is most likely correct in thinking it is something electrical. It worked just fine before it was worked on. So most likely a fuse was blown or a wire shorted during the installation of said radio. Checking all the fuses is a safe place to start. Then move on to double checking all the work done during the radio replacement.

Engine Swap 2002 Jeep Liberty

 Auto Repair Questions, Jeep  Comments Off on Engine Swap 2002 Jeep Liberty
Jun 182018
 

2003 Jeep Liberty

I have a 2003 liberty engine. I was wondering if there will be any setbacks, problems, or augmentations I will have to make to have it fit into my 2002 liberty.


As long as the engine size is the same(2.5L, etc) there should be no issues whatsoever.

Jun 132018
 

Honda Pilot

My A/C blower motor stopped working

My A/C blower motor stopped working. I removed it and checked voltage at the plug, 12.4vdc. When I plug it back in, it starts momentarily, but stops. It’s a nonreturnable part based on its electrical nature, so I want to be sure this is the problem.


Use a different source of power when testing the blower motor. I use a Power Probe when doing this in the shop. It allows you to apply power at a push if a button. If you do not have one you can use jumper wires from the battery also. If you find your blower motor is functioning just fine with a separate power source, check your blower motor resistor next.

Power Probe III – Automotive Circuit Tester

Shop Automotive

Blower Motor Replacement

Blower Motor

blower motor diagram 2004 Honda Pilot

Item Part Number Description
1 W701696 Vacuum reservoir screw
2 19A566 Vacuum reservoir
3 Blower motor electrical connector (part of 14401)
4 W701696 Blower motor screw (3 required)
5 19805 Blower motor

Removal and Installation

  1. Remove the vacuum reservoir screw.
  1. Position the vacuum reservoir aside.
  1. Disconnect the blower motor electrical connector.
  1. Remove the 3 blower motor screws.
  1. Remove the blower motor.
  1. Remove the blower motor wheel from the blower motor.
    1. Remove the push clip.
    1. Remove the blower motor wheel.

blower motor wheel

  1. To install, reverse the removal procedure.
Jun 132018
 

2008 Ford Explorer Eddie Bauer

Heat blows on the passenger side

heat blows on the passenger side, cold air out of the vents on driver side when a/c is on. Sometimes works properly for a short time on trips to Atlanta from Jackson, MS. I can hear a screeching sound sometimes when turned on. No thumping though as I’ve seen in the u-tube videos. This is going on the last 1-2 years. Has 140,000 on the mileage. The noise is coming from behind the center console I think. Is there a right and separate left blend door mechanism? or just one? Does this mean the the right door actuator needs to be replaced? Or, the actual door? Or, both?


There are two separate temperature blend doors. one for the drivers side and on for the passenger side.

Temperature Blend Door Actuator — RH, EATC

blend door actuator 2008 Ford Explorer

Item Part Number Description
1 RH temperature blend door actuator electrical connector (part of 14401)
2 W701696 RH temperature blend door actuator screw (3 required)
3 19E616 RH temperature blend door actuator

Removal and Installation

  1. Remove the RH floor console finish panel.

blend door actuator location diagram 2008 Ford Explorer

  1. Lower the glove compartment.
  1. Disconnect the RH temperature blend door actuator electrical connector.
  1. Remove the 3 RH temperature blend door actuator screws.
  1. Remove the RH temperature blend door actuator.
  1. To install, reverse the removal procedure.
Jun 132018
 

2008 Ford Explorer Eddie Bauer

My question has to do with a/c clutch on the compressor. it fell off. AC Clutch Inspection shows bolt holding the clutch in place broke off with some of it lodged in the compressor. It had to break off for a reason. Is the compressor shaft stuck so that it won’t turn. or just a bad bolt?


AC Compressor Clutch Failure

ac compressor clutch 2008 Ford Explorer

In most cases the air conditioning systems AC clutch failure is caused from bearing failure. When the bearings start to fail it creates excessive heat. The excessive heat may damage other parts of the compressor. This can cause internal o-rings to become damaged as well. My automotive advice is to replace the entire compressor assembly.