May 06 2009
where is the a/c compressor relay located on a 1995 honda accord DX 4cyl
mounted under the hood by the radiator.
Archive for the 'Air Conditioning' Category
Sep 07 2008
AC WORKS BUT, LIMITED AIR THROUGH THE VENTS.
QUESTION:
2006 DODGE RAM 3500 DIESEL – AC WORKS BUT, LIMITED AIR THROUGH THE VENTS. EVEN WHEN I CHANGE TO DEFROST. TURNING THE AIR CONTROL KNOB. NOTHING CHANGES
ANSWER:
this is a very common problem with the newer dodge trucks,you need the defrost door in the heater box.it breaks causing alot of problems,your best bet is to take it to the dealer and have them fix it
Sep 04 2008
How Air Conditioning Works
Any automotive air conditioning system employs four basic parts-a mechanical compressor, driven by the vehicle’s engine; an expansion valve, which is a restriction the compressor pumps against; and two heat exchangers, the evaporator and the condenser. In addition, there is the refrigerant that flows through this system.
The belt-driven compressor uses engine power to compress and circulate the refrigerant gas throughout the system. The refrigerant passes through the condenser on its way from the compressor outlet to the expansion valve. The condenser is located outside the passenger compartment, usually in front of the vehicle’s radiator. The refrigerant passes from the expansion valve to the evaporator, and after passing through the evaporator tubing, it is returned to the compressor through its inlet. The evaporator is located inside the vehicle’s passenger compartment. <read more>
Aug 08 2008
2002 camry le a/c light on dash flashes
QUESTION:
2002 Camry le a/c light on dash flashes occasionally and does not cool. Any Suggestions? Checked freon level OK. Heard it may be a relay? Already Tried: checked freon charge
ANSWER:
The light flashes because the compressor speed is not matching the engine speed. This is usually caused by something not turning the magnetic clutch on for the compressor. The magnetic clutch relay is usually the most common problem. See the link below.
Aug 01 2008
2002 Bonneville – manual a/c – compressor clutch does not engage
Question:
2002 Pontiac Bonneville – manual a/c – compressor clutch does not engage – trying to troubleshoot – where should i start – refrigerant pressure is fine. Already Tried:
swapped a/c clutch relay w/another relay of same part number in fuse box.
Answer:
In the underhood fuse block, you have both the Clutch Relay, and the A/C Clutch Fuse. It is important to not only check the fuse…you also need to know that there is 12volts on both sides of the fuse. This can be checked with a 12 volt test lamp.
If the AC Clutch Fuse is bad, you may have a shorted AC Compressor Clutch Diode. Keep in mind, that the Powertrain Control Module controls the AC clutch engagement. The PCM looks at other inputs before it will allow clutch engagement. Therefore, you will need to verify that there are no trouble codes stored in the PCM that may cause the PCM not to allow AC clutch engagement. The AC refrigerant pressure sensor must also be functioning for compressor clutch engagement.
Below is a bit more information that is important.
| The purpose of the air conditioning (A/C) system is to provide cool air and remove humidity from the interior of the vehicle. The A/C system is engaged when the A/C switch is pressed and the HVAC control module is in any mode except OFF. The A/C system will operate regardless of the temperature setting, as long as A/C line pressures are between 255-2968 kPa (35-430 psi) .
The HVAC control module receives power from the rear fuse block on the ignition 3 voltage circuit and battery positive voltage circuit. The ground circuits provide ground for the module. When an A/C request is selected, the HVAC control module sends a class 2 message to the dash integration module (DIM). The signal is send through the class 2 serial data circuit. In order for the powertrain control module (PCM) to internally ground the A/C clutch relay control circuit, the DIM and PCM must communicate to each other over the class 2 serial data circuits. The PCM monitors A/C refrigerant line pressure and engine coolant temperature. This information is placed on the class 2 serial data circuit and is monitored by the DIM. The DIM looks at the A/C line pressure, engine coolant temperature and battery voltage along with the A/C request input from the HVAC control module. The DIM will request A/C operation from the PCM if these parameters are within normal operating limits and the HVAC control module is requesting A/C operation. The PCM turns ON the A/C compressor by providing a path to ground through the A/C clutch relay control circuit for the A/C compressor clutch relay. Power is provided to the A/C compressor clutch relay internally of the underhood fuse block. Once the relay closes its internal switch, power from the battery is provided to the A/C compressor clutch through the A/C compressor clutch supply voltage circuit. Whenever the compressor is turned OFF, the A/C compressor clutch diode prevents a voltage spike from burning up the compressor clutch coil. The ground circuit provides a pathway to ground for the compressor. The A/C clutch relay control circuit is grounded internally within the PCM. The A/C compressor clutch will be shut down under high electrical loads. The blower motor speeds will be affected first, then the compressor will be turned OFF, unless system is in defrost mode. The HVAC system will operate as if the OFF switch has been pressed. When this happens, the driver will still have the ability to override this mode. The PCM will engage the A/C compressor clutch any time the engine speed is below 5000 RPM and the A/C is requested unless any of the following conditions exist:
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Jul 26 2008
1989 Chevy Beretta where is the air conditioning port to put in coolant?
QUESTION:
In a 1989 Chevy Beretta where is the air conditioning port to put in coolant?
ANSWER:
I think on this one it is located near the battery and under the air intake box/hose assembly. It is in the thicker of the two a/c lines. So you can follow the thicker line from one end to the other and are guaranteed to find it.
Air Conditioning Troubleshooting and How to Recharge A/C
keep in mind this is a small port since it requires R-12, It looks like a but bigger than a valve stem cap on the wheel. It is referred to as the low side port and is between the compressor(sometimes located on the compressor itself) and the Evaporator(which is located in the dash and connects through the fire wall on the passenger side)
Jul 22 2008
I need to locate the low side port of the a/c on a 3.5 liter Oldsmobile Intrigue
Question:
I have a unit to test a/c refrigerant level/pressure and if it needs more or needs other repairs. I need to locate the low side port of the a/c on a 3.5 liter 1999 Oldsmobile Intrigue engine to attach the unit. Can you tell me where it is? Already Tried: Looked under the hood and was not sure if I located it or not. I think it is on the right side of the engine as you look at it in front of the brake lines and a bit lower.
Answer;
The low side fitting is on the accumulator on the right side of the engine compartment(driver side). You should be able to trace the large line at the compressor back to the accumulator assembly.
Jul 16 2008
Air Conditioner blows warm air
- 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.
- Air conditioner compressor clutch not engaging. Check compressor clutch wiring, electrical connections and compressor clutch, and repair or replace as necessary.
Jul 09 2008
air conditioner is on it blows “mist” through the vents
Question:
I have a 1996 Buick Regal custom. When the air conditioner is on it blows “mist” through the vents, and when I turn the car off and look under the car, there is no puddle of water under the car from the A.C., whats wrong?
Answer:
The drain vent is clogged up , it is sometimes difficult to access it , it comes through the firewall and generally you need to be under the vehicle..most any shop should be able to clear this for you in short time …easiest to do on a hoist
Jun 30 2008
Are two separate a/c units in the 1995 Ford Econoline ?
Question:
Are two separate a/c units in the 1995 Ford Econoline E150 van. This is a custom/conversion. (service advisor at dealership did not know answer)
Answer:
No. There is only one compressor, one Accumulator, but there are 2 evaporators and two blower motors etc. The system all uses the same freon .
