The blower works at all speeds. The A/C cools and cycles as it should. The problem is that cool air blows all the way up to 84 degrees. I have to push it up to 85 degrees to get warm air. It worked perfectly up until a week ago or so. What's wrong with this thing?

99 GLE, auto climate control

Is there a diagnosis sticky?

 

mine always did that? i thought the climate control just sucks cuz its old...thats why i rely on my buttwarmers..hah

 

what do you mean by warm? i only put it at 85 in the winter to defrost my windshield -otherwise it's way too hot. maybe you have a bad heater core or just a clog. check the in and out hoses fro the heater core. they should be both hot when the engine is warmed up.

 

Most likely a sensor has gone bad. Do a search on here for the instructions on how to put the system in diagnostic mode. It will show you the value for all of the sensors in the system. Compair them to specs and you'll see which one has failed.
Probably one of the temp sensors, but you need to verify that.

 

I ran the diagnostics several times and in step 2 got a blinking -24. According to mdeal's write-up, this value should be either 20 or 25. So, it looks as though it's a sensor or sensor circuit.

Which one? According to burhan92se's post about 3rd gen, the minus 24 indicates a short circuit of the intake sensor. The intake sensor, however, gave readings in step 5.

The other tests ran through without variation from mdeal's values.

In step 5 the temps are
ambient sensor temp: 72 degrees
in-vehicle sensor temp: 76 degrees
intake sensor temp: 127 degrees

 

I don't know where the intake sensor is located (inside the cooling unit?), but 127 degrees seems high since the car was in the garage and cold until I pulled it out into the sun to avoid a sunload sensor error code.

Does someone have pictures of the intake sensor?

 

24 is indeed the intake sensor, as it shows in the FSM.

Refer to HA-88, it shows the location and general image of the intake sensor. It appears to be either in the evaporator or the blower motor housing.

 

I replaced the intake sensor and it's working again. It cost $19 plus tax. Part number 27723-39U00.

 

This used to happen to my car, it was either too hot or too cold, no happy medium. Then I replaced my control unit with a different one. The only reason I replaced it was to get one with the ambient temp. feature, but now it's fine.

 

hmm interesting , i probably replace mine soon then.

 

I have a 99 gle and i am having the exact same problem, where is the intake sensor located and how long did it tae to replace it?

 

My little interior temp sensor right behind the little grate in the climate control was really clogged with dust and stuff, I took it apart, cleaned it real well, and the climate control on my 97 works flawlessly.

If only I had an AMB button I would be one happy camper.

 

The resistor end of this part is held in place by a white plastic piece that sticks in between the fins of the evaperator. Remove the glove box (six screws). Remove the metal brace, then remove the ~four screws holding the lower half of the evap box together. There's also a clip. The connector end of the part is outside the evap box facing you toward the center of the car. The wire passes through a small rubber gasket.

Pry apart the two halves of the evap box enough to get a hand in there to pull the piece holding the resistor end between the fins. Pull out the rubber gasket. Unsnap the resistor from the connector.

Reassemble with the new sensor.

Takes about 20 minutes with a power drill and a long (four inch) phillips head driver.

 

Ok so i replace my intake sensor and the problem is still occurring. I ran the system thru diagnostic and #2 is blinking -22, then 25. Could there be another problem or sensor that has gone bad?

 

Are you doing the test inside or while it's dark out?

 

On page 1400 of the FSM (HA-68) it says that -22 is the in-vehicle sensor circuit is shorted.