Question about 2008 Lexus Rx 400h

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Hi, need to troubleshoot my A/C system, do you have the interface for the electric air compressor?

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2008 should be under warranty, why not let an experienced tech with the proper equipment diagnos that. the electric components on the hybrids are touchy and should be masintaine and repaired by a trained tech. you dealer can help you with this.

Posted on Oct 03, 2009

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2004 Lincoln navigator air suspension all the way down front and back if I was to jump the relay to turn compressor on should the truck start raising up unless compressor not pumping or a leak


no it wont. the air suspension works as a complete system. each air spring has an electric solenoid, each corner has an electric height sensor and then the compressor itself. just energizing the compressor will not open the solenoids or sensors both of which are needed to raise the vehicle. what is probably happening is a failure in the computing system for the suspension system. expensive to repair.

Jan 18, 2017 | 2004 Lincoln Navigator

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Hi gee thank u for repling my mesg i rely appreciate it.The reason why i am looking for fuse is that the air brakes just stoped working on my toyota dyna 1995 model it is a 3.5ton.The air brakes works


check the air pressure in the tanks . If the non-return valve from the compressor is not functional then the air leaks back out the compressor . As the only electrical parts in the air system is the brake lights and pressure switches to turn on the low air buzzer I need an explanation as to why you think that a fuse will stop the air brakes working.. More details will be a help.

Jun 08, 2014 | 2005 Chevrolet Malibu

1 Answer

Air conditioning blows hot and cold air


You will need to know if the compressor is working when it blows hot air to proceed. It could be an electrical problem, a blend door problem, or the a/c clutch on the compressor.

Jul 02, 2012 | 1999 Honda Civic

1 Answer

Can you tell me exactly how to fix my air shocks.....is there a manual pump?


System has no manual pump.system overview is this,air springs at all four wheels,electric valve at each spring,air line from these valves to a compressor under hood and lastly level switches that look at height and run compressor and open valves according to need.most likely the air spring bags are cracked causing leaks to system in turn which over works the compressor.best hope is just no power to compressor,so test for power and ground at compressor and if no power.power it up and raise veh or if there is power the compressor is smoked.

Oct 24, 2011 | 1995 Lincoln Continental

1 Answer

Problem with heating and air conditioning. The driver's side is blowing hot air and the passenger side is blowing cold air


Air Conditioner blows warm air
  1. Air conditioner system is discharged. Have the system evacuated, charged and leak tested by an MVAC certified technician, utilizing approved recovery/recycling equipment. Repair as necessary.
  2. Air conditioner compressor clutch not engaging. Check compressor clutch wiring, electrical connections and compressor clutch, and repair or replace as necessary.

Jun 01, 2011 | 2004 Buick Century

1 Answer

Need to change ac compressor need to know best way to remove


Check this two procedure for...

2.2L (VIN 4) Engine
  1. Properly discharge the air conditioning system into a recovery/recycling machine.
  2. Remove the drive belt on the vehicle.
  3. Remove the air cleaner and resonator assembly.
  4. Unplug the electrical connections from the compressor.
  5. Disconnect the negative battery cable.
  6. Unfasten, then remove and cap the A/C hose from the compressor.
Cap the refrigerant lines when opening the system to prevent the entry of dirt and moisture and the loss of refrigerant lubricant.
  1. Loosen the A/C compressor bolts, then raise and support the vehicle.
236a413.jpg

Fig. 3: Compressor mounting on the 2.2L (VIN 4) engine
  1. Remove the compressor.
To install:
  1. Position the compressor on the vehicle.
  2. Lower the vehicle.
  3. Install the compressor bolts, then tighten the front bolts to 37 ft. lbs. (50 Nm) and the rear bolts to 22 ft. lbs. (30 Nm).
  4. Attach the compressor hose using NEW sealing washers. Tighten the mounting bolts to 24 ft. lbs. (33 Nm).
Lubricate O-rings with refrigerant oil.
  1. Engage the electrical connections to the compressor.
  2. Install the air cleaner and resonator assembly.
  3. Install the serpentine drive belt.
  4. Connect negative battery cable.
  5. Evacuate and charge the system.
  6. Perform a leak test on the system.

3.1L (VIN M) Engine
  1. Properly discharge the air conditioning system into a recovery/recycling machine.
  2. Disconnect the negative battery cable.
  3. Remove the serpentine drive belt.
  4. Remove the front compressor bolts.
  5. Raise and safely support the vehicle.
  6. Remove the rear compressor bolts.
5121365.jpg

Fig. 4: Compressor mounting on the 3.1L (VIN M) engine
  1. Unplug and cap the coupled hose assembly from the rear of the compressor.
Cap the refrigerant lines when opening the system to prevent the entry of dirt and moisture and the loss of refrigerant lubricant.
  1. Disconnect the electrical connection at the compressor.
  2. Remove the compressor from the vehicle.
To install:
  1. Install the compressor on the vehicle, engage the electrical connection to the compressor.
  2. Install the coupled hose assembly to the rear of the compressor, with NEW sealing washers. Tighten the mounting bolt to 24 ft. lbs. (33 Nm).
  3. Install the rear compressor bolts. Tighten the rear bolts to 8 ft. lbs. (25 Nm).
  4. Lower the vehicle.
  5. Install the front compressor bolts. Tighten them to 37 ft. lbs. (50 Nm).
  6. Install the serpentine drive belt on the vehicle.
  7. Connect the negative battery cable.
  8. Evacuate and charge the system.
  9. Perform a leak test.
Hope this help (remember rated this).

Jul 09, 2010 | 1994 Oldsmobile Cutlass Ciera

1 Answer

Hi there... About 2 months ago my air conditioning was blowing hot air while air con was on cold Hyundai replaced the compressor after numerous phone calls & second opinions now my air compressor is...


I can tell you general principles about A/C but have not worked on a Hyundai. If the A/C lines under the hood and directly from the black cylinder tank are frosted or sweating, you have Freon circulating.

There are 2 cutoff switches in all systems. A low pressure and high pressure cutoff. The ideal amount of Freon is in the middle of these 2 pressure points.
In this way the compressor clutch will stay engaged the longest and keep the Freon circulating the longest. This is the way you get COLD air.

There are ways to measure the pressure and to find leaks. You can sometimes loan tools from Autozone or Oreillys for a deposit. Before blaming another electrical problem for the lack of COLD air you should test the pressure of the Freon left in the system. If you are within 90 days or 3000 miles, most minimum warranties cover the parts. With factory warranty it should go farther.

In answer to your electrical concern, yes there is another system controlling the A/C. The ductwork has either vacuum operated or electrically operated doors (flaps) under the dash. These "doors" blend the airflow by mixing cold and hot air to give you the temperature you want. If you want all COLD you keep the heater door shut and so on.

So you look at these areas separately first. Under the hood is the Freon pressure good? Pipes sweating? Compressor clutch on steady? And if everything under the hood is good, then you look inside the car at the ductwork.

I hope this helps you.

May 19, 2010 | Cars & Trucks

1 Answer

2003 chrysler pt cruiser air conditioner is putting out only hot air


This is only a DIY check list of probable faults.
1. Electrical failure thro' the Fuses and Relays that energise the Compressor clutch.
2. Lack of Freon in the System,
3.Split Hi or Lo pressure hoses, due to chafing on the engine or body work, causing pressure loss.
4. Failed Expansion valve.
5. Leaking coupling joint seals in system.
6. Broken Drive belt for the Compressor.
7. Failed Compressor Clutch Electric windings,
8. Failed Hi pressure hose/pipe In line switch, that also enegises the compressor clutch.
9. Defective Thermostat in the Evaporator core.
10.Holed Condenser permitting pressure loss.
Best of luck on the fault finding trail.
I suggest a trip to Walmart, to acquire the low cost Charge canisters to find the pressure loss fault,if it is not in the other fault suggestions.
Regards DT

May 10, 2010 | 2003 Chrysler PT Cruiser

1 Answer

My 2004 ford e150 Sherrod package van has terrible ac


Hi, first, locate your a/c compressor under the hood. With the a/c on, check the compressor to see if it is "cycling" meaning the compressor clutch engages and disengages. This is easy to see, just look at your a/c pulley connected to your serpentine belt. If the 3 studs on the outside of the pulley spin and stop spinning, this is what is called cycling. Too much cycling (turns on and off frequently) means you are low are refrigerant, most likely r-134a. Eventually EVERY a/c system on a vehicle will leak due to vibrations and o-rings shrinking from outside elements. Some systems have small pinhole leaks which require an a/c recharge. BUT before assuming you need a re-charge, make sure your electric fan is working!!! The same problem will happen as you describe if your electric fan is not working, or if your electric fan has multiple speeds and one of the speeds is not working. Since you are feeling cool air, your system does NOT have a major leak, if it did, your compressor would not turn on due to no refrigerant in the system.

Jul 27, 2009 | 2004 Ford Econoline

1 Answer

I have charger the air condition an sitt will not get cold


I am the original owner of a 1998 Ford Escort SE wagon. The summer of 2008 I had problems with my A/C system - the first A/C problem on this vehicle. Be careful that you do not over-charge your R134-A system.
1. Check that the A/C Compressor Clutch engages and drives the compressor properly (via the
serpentine drive belt and proper engine idling speed, A/C switched "on" etc.). If the A/C
compressor clutch doesn't engage and drive the compressor you will not be able to charge the
system to the correct refrigerant capacity and operating pressures.
2. You should be familiar with and have the proper tools to test & troubleshoot your auto's A/C
system. Test gauge(s), hose & connector's will be needed.

If the A/C compressor clutch does not engage the compressor, then you will need to troubleshoot the electrical system and components related to your auto's A/C system. This can be time consuming and requires more skill and information (accurate electrical schematics, etc.).

My problem:
1. A/C clutch didn't energize and engage.
2. System slightly low on R134-A, about a 7 oz. charge was needed after all was taken care of.

Solutions:
1. Electrical problem in the electronic controls for the A/C system. The "Contant Contol Relay
Module" (Ford part no. 3S4Z-12B577-BA, RELAY) had to be replaced. Sometimes Ford calls
this "black box" unit an "Integrated Control Relay Module". The location of this "black box" on my vehicle is under the engine intake air filter housing - replacement cost (new) is about $230;
(used) about $35.
2. Charged the required amount of R134-A into the system via the proper test gauge and related
equipment.
Please note: I have experience and training in mechanical (including refrigeration systems) and electrical systems.


Apr 25, 2009 | Ford Escort Cars & Trucks

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