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I have a BMW 730IL 1995 model, recently the control & display of the air conditioning, fan, temperature display went dead, I could not operate any of those function, all other functions such as radio, TV, cassette, cd are working fine. I checked the fuses &all are OK. the worst thing is the heat from the vents / fire wall down below the dashboard keep blowing in when the engine start to get hot is unbearable & can not stop. please help, my email: dennisd3@tpg.com.au. Thanks in advanvce

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  • Dennis Dinh Jan 19, 2013

    Could not find the heater relay switch as advise, please help to show where it is.

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  • Expert
  • 165 Answers

Check your heater relay switch and blower but first the switch : )

Posted on Jan 14, 2013

  • Dennis Dinh Jan 16, 2013

    Hi Frank, I could not find the heater relay switch, do you happen to know where it should be? I need to mention that all the lights / tdigital emperature display on the whole control panel of the fan, heating &cooling are all off, maybe it's a wiring problem? Note that I did swap for a fully operational control panel but still the same problem.

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SOURCE: Climate control stopped operating overnight during below freezing

Well last night I went under the hood, opened the fuse panel and removed the "Memory"/Audio fuse, in my car it was yellow and only pulled up, not out, it was a "20". I left it out for a few min, pushed the fuse back in and everything is fine now, just have to reset my clock.

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Posted on Jan 12, 2009

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SOURCE: 2001 BMW 330i..Fan for AC/vent not working?

it's either a fuse or it's a bad blower motor, it could be a bad blower motor resistor but usually you'll get either high or low only, so if you have nothing on any speed, high low etc, and all the fuses are ok chances are it's your blower motor.

Posted on Jan 16, 2009

ginko
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SOURCE: climate controll inop. on 95 devile

The problem may be a faulty blower motor behind the heather core, or a problem with wirings.

Posted on Feb 23, 2009

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SOURCE: air condition not blowing cold air

Is any air coming out at all?

If warm air is being blown out, then your refrigerant level is probably low. The car is fitted with a safety cut off, to stop the air conditioning system working if the refrigerant (R134a) level is low.

This cut off only effects the air conditioning, the blower would still function normally.

Posted on Apr 21, 2009

jsmes1027
  • 749 Answers

SOURCE: 2005 GMC Yukon Denali XL - Climate Control issue-

Are you aware of any codes that may stored in the body control module and do you hear a clicking or ticking noise in the rear?

Posted on Nov 02, 2010

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What is a IHKA module and a IDrive screen on a 7 series 745li bmw 2004 and how to fix it


The iHKA is the air conditioning control unit. The panel where you turn on and off the air conditioning and adjust the temperature. The I-drive screen is actually called a CID and it is a control display for all the functions such as navigation, radio, settings, climate control, services due, etc... There really is not a way to fix them without replacement. The control units are programmed to the vehicle and are usually VIN specific and cannot be used from car to car without causing other issues. I have used them temporarily to test a module but never left in or tried coding mine to another model. That makes it hard because you must replace it and that is expensive !!! You can try a used one from a junk yard but most likely will cause new issues

Oct 07, 2014 | BMW X7 Series Cars & Trucks

Tip

Tips for operating Air conditioning system on Toyota Hilux and someother...


To cool off your Toyota after it has been parked in the hot sun, drive with the windows open for a few minutes. This vents the hot air, allowing the air conditioning to cool the interior more quickly.

Make sure the air intake grilles in front of the windshield are not blocked (by leaves or snow, for example).

On humid, do not blow cold air on the windshield. The windshield could fog up because of the difference in air temperature on the inside and outside of the windshield.

Keep the area under the front seats clear to allow air to circulate throughout the vehicle.

On cold days, set the fan speed to high for a minute to help clear the intake ducts of snow or moisture. This can reduce the amount of fogging on the windows.

When driving on dusty roads, close all windows. If dust thrown up b the vehicle is still drawn into the vehicle after closing the windows, it is recommended that the in intake be set to FRESH and the fan speed to any setting except "OFF".

If following another vehicle on a dusty road, or driving in windy and dusty conditions, it is recommended that the air intake be temporarily set to RECIRCULATE, which will close off the outside passage and prevent outside air and dust from entering the vehicle interior.

HEATING

For best results, set controls to;
Fan speed ---- Any setting except "OFF"
Temperature----Towards WARM (red zone)
Air intake ---- FRESH (outside air)
Air flow ---- FLOOR
Air conditioning ---- OFF

For quick heating, select recirculated air for a few minutes. To keep the windows from fogging, select fresh after the vehicle has been warmed.

Press the "A/C" button on for dehumidified heating.

Choose floor/windshield air flow to heat the voltage interior while defrosting or defogging the windshield.

AIR CONDITIONING

For best results, set controls to;

Fan speed --- Any setting except 'OFF"
Temperature --- Towards COLD (blue zone)
Air intake --- (outside air)
Air flow --- PANEL
Air conditioning --- ON

For quick cooling, move the air intake selector to recirculate for a few minutes.

VENTILATION

For best results, set controls to;

Fan speed --- Any setting except 'OFF"
Temperature --- Towards COLD (blue zone)
Air intake --- (outside air)
Air flow --- PANEL
Air conditioning --- ON

DEFOGGING

The inside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone) to heat; COLD (blue zone) to cool
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- ON

The outside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone)
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- OFF

On humid days, do not blow cold air on the windshield. The windshield could fog up because of the difference in air temperature on the inside and outside of the windshield.

DEFROSTING

The outside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone)
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- OFF

To heat the vehicle interior while defrosting the windshield, choose floor/windshield air flow.

on Feb 14, 2011 | Toyota Pickup Cars & Trucks

1 Answer

The radiator fan on my 2007 bmw 525i works fine while car is driving. Once i stop at a red light or in traffic the the fan stops working, ac blows hot air and mins later the car overheats. The car has a...


My guess is that your electric fan is NOT operating at all. Under normal conditions, just going down the highway, your cooling system will function just fine without a fan running. The air flow through the radiator is adequate to keep things cool. However, when you stop, you quickly get into an "overheat" situation. Actually, you should be able to hear your fan begin operating when your engine temperature starts climbing or your air conditioner requires the fan to do its thing. Note: If you've ever severely overheated your engine, your problems may be worse than just a fan not running, but you really do need to confirm whether your fan is operating correctly, or not. Another note: I had a vehicle with a tendency to overheat when stopped. It turned out to be a faulty (leaking) pressure cap on the cooling system.

Nov 04, 2013 | BMW 525 Cars & Trucks

1 Answer

1995 Oldsmobile 88 Royale - AC Issues


So the ac is not working. Is the compressor running when you have the control set for ac ?

Jun 27, 2013 | Oldsmobile Eighty Cars & Trucks

1 Answer

Which codes (OBDI or II) do I use for my 1994 Jeep Grand cherokee laredo 4.0 2wd


before 1996 they use onboard diagnosis system for jeep.

when you turn on key you need to count check engine light blinks.

here are codes taken from internet.

11* No crank reference signal detected during engine cranking.
12* Direct battery input to PCM was disconnected within the last 50 key-on cycles.
13** No difference recognized between the engine MAP reading and the barometric (atmosphereic) pressure reading at start-up
14** MAP sensor input below minimum acceptable voltage.
or
MAP sensor input above maximum acceptable voltage.
15** No vehicle distance (speed) sensor signal detected during road load conditions.
17* Engine coolant temperature remains below normal operating temperatures during vehicle travel (thermostat).
21** Neither rich nor lean condition detected from the oxygen sensor input.
or
Oxygen sensor input voltage maintained above the normal operating range.
22** Engine coolant temperature sensor input above maximum acceptable voltage.
or
Engine coolant temperature sensor input below minimum acceptable voltage.
23** Intake manifold air temperature sensor input above maximum acceptable voltage.
or
Intake manifold air temperature sensor input below minimum acceptable voltage.
24** Throttle position sensor input above maximum acceptable voltage.
or
Throttle position sensor input below minimum acceptable voltage.
25** A shorted condition detected in one or more of the idle air control motor circuits.
27* Injector #1 output driver does not respond properly to the control signal.
or
Injector #2 output driver does not respond properly to the control signal.
or
Injector #3 output driver does not respond properly to the control signal.
or
Injector #4 output driver does not respond properly to the control signal.
or
Injector #5 output driver does not respond properly to the control signal.
or
Injector #6 output driver does not respond properly to the control signal.
33* An open or shorted condition detected in the A/C clutch relay circuit.
34* An open or shorted condition detected in the speed control vacuum or vent solenoid circuits.
or
Speed control switch input below the minimum acceptable voltage.
or
Speed control switch input above the maximum acceptable voltage.
35* An open or shorted condition detected in the radiator fan relay circuit.
41* An open or shorted condition detected in the generator field control circuit.
42* An open or shorted condition detected in the auto shutdown relay circuit.
44* An open or shorted condition exists in the engine coolant temperature sensor circuit or a problem exists in the PCM's battery temperature voltage circuit.
46** Battery voltage sense input above target charging voltage during engine operation.
47** Battery voltage sense input below target charging voltage during engine operation. Also, no significant change detected in battery voltage during active test of generator output.
51** Oxygen sensor signal input indicates lean air/fuel ratio condition during engine operation.
52** Oxygen sensor signal input indicates rich air/fuel ratio condition during engine operation.
53* PCM internal fault condition detected.
54* No fuel sync (camshaft signal) detected during engine cranking.
55* Completion of diagnostic trouble code display on the malfunction indicator lamp (check engine lamp).
62* Unsuccessful attempt to update SRI (service reminder indicator) miles in the PCM EEPROM.
63* Unsuccessful attempt to write to an EEPROM location by the PCM.

* - Check engine lamp will not illuminate at all times if this code was recorded. Cycle ignition key as described and observe code flashed by check engine lamp.

** - Check engine lamp will illuminate during engine operation if this code was recorded.

PCM = Powertrain Control Module (the engine computer)
MAP = Manifold Absolute Pressure (the sensor that measures how hard the engine is sucking air through the intake manifold
EEPROM = Electrically Erasable Programmable Read Only Memory (a type of computer chip used inside the PCM)

Nov 19, 2011 | 1994 Jeep Grand Cherokee

2 Answers

1995 BMW 525I over heating issue. I repaired head


Hi, Sounds like you have tried about everything. Ok the aux. coolant switch is for the electric pump for the heater core will not cause an over heating condition just a longer warm up of the heater core. Has the cooling system been bleed properly if there is a trapped air pocket it will not let coolant circulate. Was the new thermostat installed correctly? They have a vent that needs to be towards the top or they trap air on the back side and cant take an accurate reading to open and close. Other areas to look at would be proper operation of the fan clutch, if they fail they can cause the fan to not lock up properly and supply enough air movement through the radiator. The aux. electric fans and their temp switches do you hear them coming on are they coming on at the right temp.

Aug 26, 2010 | 1995 BMW 5 Series

1 Answer

Where is the air conditioner blower fan relay on 1996 Jeep Grand Cherokee located?


The blower fan relay is located in the fuse box on the driver's side fender-well. A Jeep Cherokee uses an electric fan as an auxiliary fan for engine cooling and for cooling the air conditioning condenser when the air conditioning is in operation. A radiator temperature-sensing switch that activates the fan relay at 198 degrees F turns the fan on and controls its operation. The temperature drops when the vehicle is in motion and the switch turns the fan off. When the air conditioning system is in operation, the air conditioning relay supplies power to the fan relay via a fan diode downstream from the ignition switch. This diode activates the fan relay and keeps the fan operating as long as the air conditioning is on. Thanks. you can rate this solution and show your appreciation.

May 18, 2010 | Cars & Trucks

1 Answer

BMW 325ci - Car cuts off on very hot days - Error code P00128


Check the following :

BMW Code PO128
This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125
In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant

temperature (ECT) sensor reading, and the speed of the vehicle.

You will likely not notice any drivability problems other than the MIL illumination.
A code P0128 may mean that one or more of the following has happened:
  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Faulty cooling fan (running too much)
  • Faulty coolant temperature (ECT) sensor
  • Faulty intake air temperature (IAT) sensor
solutions
Past experience indicates that the most likely solution is to replace the thermostat. Verify coolant strength & level
  • Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
  • Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
  • Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
  • If the above items check out good, replace the thermostat

Aug 18, 2009 | BMW 5 Series Cars & Trucks

1 Answer

Air condition kicking on and off


HI, i have a 2000 323i and it sounds like we have a similar problem. my a/c works fine when the blower is going but some times it goes out of control and it's almost like it has a mind of it's own. and sometimes i turn off the car and the blower keeps blowing air even if the car is completely off and the keys are out.
I'm replacing the blower resistor to fix that. i was at the delaer today and spoke to a mechanic and its a common problem on the final stage blower resistor. you have to reach the blower to replace it but its easyer that it sounds.

Good luck

Jul 07, 2009 | 1999 BMW 323 Series

2 Answers

AIR CONDITIONER WILL NOT COOL WHEN IDLED


Typical problem of R-134 freon. It just doesn't perform well at idle, though hardware changes over the years have improved performance in later models.

However, be sure to cover the bases. Check freon charge with gauge set. Don't guess. Make sure the pressures are correct and that cooling fan is functional and nothing restricting air flow at condenser & radiator. High pressure from car wash wands can fold-over the cooling fins at radiator thus restricting air flow. I suspect all this is good but you should make certain to remove any doubt.

Jun 23, 2009 | 2002 Jeep Liberty

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