Did you allow the climate control panel to go through its calibration when you first hooked the new unit up?

If not it may not have the correct positions for the airflow direction flaps.

 

I didn't know it did such a thing? What is the procedure?
Doesn't seem to be a problem with airflow direction, just temperature.

 

What does the system think the outside temperature is? This is either in the Infocentre or (I think) the speedometer LCD when you press the Trip button (or something).

If the system thinks it's -21 degrees C outside, as mine often does, then it will tend to bias towards too much heat for any given temperature. It's a correction factor that it applies to avoid blasting cold air into the cabin.

-Alex

 

Ambient reading is as accurate as it ever was-as I said, the problem started when I changed the control panel 3 days ago.

 

You need to get the climate ecu reset. dealer only job, 1/2 hour labour charge, about £50.

 

that's 3 replies with 3 different theories!
can anyone confirm any of them?

 

Two are pretty much the same answer - calibration/ecu reset are basically the same idea.

The climate system uses motor controlled flaps to adjust air flow to all the different vents and to switch between cold/warm air - it may well be that the climate system hasn't got the correct position for the cold/warm air flap.

When I fixed mine (after the temp control stopped working) when I hooked the unit back up it you could hear all the air direction flaps moving about. I was told it they go through a calibration procedure when you first power them up and not to touch anything untill it was finished as it would interupt the calibration.

I would try disconnecting the battery for a few minutes and then re-connect it and I think that will cause the climate unit to re-calibrate itself - either that or go to a dealer and get them to re-set it.

 

OK, gotcha...unfortunately, unhooked the battery yesterday to change the coolant temp sensor,for a different problem, but after reconnecting still have the same problem.. with unregulated hot air constantly...hoping my indie will be able to sort it.

 

was told (by local indie) to disconnect battery for 10 minutes, reconnect and leave for 10 minutes, then all should be ok.....not.
going to pull it out again and look at connections, then it's off for ecu reset!

 

in the center consoe under the heater dial is a small circular hole with bras over it, get a hoover and place the end of it over this hole and suck, this may clear the problem on it's own, otherwise you'll have to remove the center console and pull out this sensor below, there is a fan in the opposite end to my fingers which clogs up with dust and prevents air being drawn over the sensor tip thus giving a false reading.

Alfa Moo, you don't need to worry about this as it's your cars sensor i'm holding there. Did it whilst I removed that phone rubbish.

 

I had to unplug this sensor from the old unit and fit it to the new when I swapped them-and it was full of dust, which I blew clear. I can hear the little fan running when ign is on, so it's functioning, fan-wise....is there any way of testing resistances or anything like that? Before I spend (waste?) another 50-80 quid on yet another panel??

 

The green sticker there has a resistance value on it, I should have noted it but forgot and none of the pics I have show it, hopefully yours will show it.

 

Have you tried the heater mixture control motor. It is on the side of the heater box in the drivers side. If you look up the side of the heater box and move the temp control knob you should see the spindle move. If not the motor may well have packed up. They are resonably common failure there are 2 motors on that side of the heater box both exactly the same one does temp and the other vent direction. These motors are around £60 each and are fiddly to fit.

 

A good tip, but not relevant in this case (I'm fairly sure!) as if I select Hi or 32 for a couple of minutes, then switch to 16.5, it does blow cool for a minute or two, so I think the controls are all working as they should, it just doesn't want to give me cool air!

 

had the same problem with mine so I also purchased a replacement panel from the bay and it blew hot on every setting appart from low. Spoke to my local specialist who used to be the workshop controller for the lincoln dealership when we had one, he told me that there ws a batch of cars that came to the uk with the heater programed for use in norway so they had to reprogram the control panel. Did'nt fancy a drive to stoneacre so had a 2nd look at the original panel and found it was a 10min fix.
Quick note the sensor on the drivers side seems to split in 2 pieces and fall off, with carefull use of super glue and solder can be fixed so both temp dials work and no need to replace.
hope this of some help to anyone

 

That's interesting Stevie-I am cursing throwing my old panel away, as have now found out via another thread that it was probably a simple fix...
Looks like I will have to invest in another panel then-at least I can get my money back for this one.
Cheers for the tip.
Martin

 

Hi,

Did you get a resolution to this problem, I have exactly the same issue, just constant boiling air, unless the climate control is set to low, then it blows cold just fine!

 

yep same problem for me, is there a cure?

 

Hot air only!!!! Unless set to Lo.

Any cure for this. As per other threads - all fine re direction motor. just constant hot air. Any conclusive answers as to this just being cabin temperature sensor? Two specialist garages have had a look at this, and both declared the heater system to be working perfectly. My axxe!!

 

Anyone knows it temperature sensors are the same for pre-facelift and facelift? I have a facelift sensor and a pre-facelift climate control which tends to misbehave..

 

Again, look at the wiring from the second coolant temp sensor which informs the climate control panel the temp of the coolant for cliamte control purposes. It is located on the hose that is between the rear of the engine and the firewall - just above the gearbox, it is green in colour, with my 156 1.9Mjet the wiring was damaged, and after fixing the wiring it all works perfectly!!!!

 

Anyone know the part number for this sensor on a 1.9 JTD 16V 2004?

Thanks

 

dhillon how much disassembling is required to get to that sensor? Also, im asking this for a y. 2000 156 V6.

 

I looked today and I cant find anything like described. Anyone has a picture? Would that sensor output be visible in FES?
Also if anyone was wondering.. sensors are not the same between facelift and prefacelift versions.

 

LifT up this thread. Any ideas guys?

 

I'd start with hooking up MES.
You can then read all the relevant temp sensors to see if they display correct values, plus exercise all the flaps etc.

 

Also does this tell the Dash temperature gauge the temperature?

 

Dash water temp gauge value come from the temp sensor on the thermostat

 

I just replaced a faulty thermostat, the car was never reaching temperature.
Now if I put my OBD scanner on the temperature on the OBD seams accurate and the dash temp seems to be around 20'c cooler, broken gauge?

Thanks

 

Did you use the old temperature sensor unit or was a new one included together the thermostat?

The temperature sensor unit include two sensors, One for the ECU and one for the gauge.
So your issue could be cause by a faulty temperature sensor for the gauge.

 

No the stat came with a new sensor,

Where is the gauge sensor, I imagine near the bulk head?

Is it the same sensor as the stat one?

Thanks

 

The two sensors are in the same physical unit on the thermostat

Have a look in the attached wiring diagram. K36 is the temperature sensing unit (with two sensors)