Hi all,

 

I've still got problems with the heater in my Zed - it blows hot no matter what temp setting you put it on, and even when it's switched off hot air flows out. The only way I can drive the car is with it switched off and on recirc!

 

I took the dash apart the other day and checked a few things. From what I can see, the door in the large opening (for the face vents) works fine - it moves when I change it to screen/vent/feet etc. The recirc also works fine as I can hear and see it moving (behind the glovebox).

 

What I can't get to do anything are the two actuators that sit underneath the main matrix, visible from the passenger side. No matter what I set it to, they don't seem to move.

 

Any ideas why, or what I can check? I don't think I have a dodgy sensor as the self diag doesn't give me any open/shorted circuits...

I remember when my heating only blew hot air, it was the actuators you mentioned above (air mix motors) they were not plugged in to the aircon ecu. check everything is connected first.

I have seen this with 2 of my cars now and with several other club members cars. Most comon thing is either after doing work on the Dash ie removing heater matrix fitting a manual peddle box etc. The heater ducts on the drivers side have sensor on them to measure the output temp. Often cowboys forget to put the lower duct for you feet back in. Thinking theres no point as the feed from the matrix housing will still blow at your feet or they just for get to plug in the sensor for either that duct or the duct leading across to the door vent. Both have a sensors and if either are missing or disconected you'll just get hot air as it is getting no reading back to the aircon ECU

Just reread this and if you can see into the bottom of the Matrix housing then the ducting for you feet is missing and therefor the sensor isn't in it so no ECU reading and hot air. You need a second hand one with the sensor in it.

I remember when my heating only blew hot air, it was the actuators you mentioned above (air mix motors) they were not plugged in to the aircon ecu. check everything is connected first.

 

Ta mate

 

I've checked the connectors onto the actuators and they seem fine, but how the hell do you check the connectors to the aircon ecu, or check the 'intermediate connector' that is mentioned in the service manual? I can't find exactly where they are or how to get into where I think they might be. Is it a dash out job?

Just reread this and if you can see into the bottom of the Matrix housing then the ducting for you feet is missing and therefor the sensor isn't in it so no ECU reading and hot air. You need a second hand one with the sensor in it.

 

Hello mate,

 

I removed the plastic ducting on the passenger side to be able to see the two actuators, and didn't find any sensors on it - I assume this is correct? There are sensors on the driver's side, but they seem to be connected fine and as mentioned previously, I don't get any errors in self diag.

 

However, I do remember that while the ducting was there, it wasn't fitted in quite right and there was a gap somewhere... maybe it's not pushing enough air past the sensors? I'll check...

the air con ecu is to the side of the clutch pedal tucked up on the side of the centre. if all are connected and the motors are connected then check that the sensors on the ducting are connected like mark suggested. the ducting is just below the dash.

the air con ecu is to the side of the clutch pedal tucked up on the side of the centre. if all are connected and the motors are connected then check that the sensors on the ducting are connected like mark suggested. the ducting is just below the dash.

 

Cheers Jimmy - I'll have a look. I thought I'd found the aircon ECU before - black box, above and left of the clutch pedal - but couldn't see the connectors. I'll do a bit of contortionism and get in there a bit further to double check!

Cheers Jimmy - I'll have a look. I thought I'd found the aircon ECU before - black box, above and left of the clutch pedal - but couldn't see the connectors. I'll do a bit of contortionism and get in there a bit further to double check!

 

yep that black box is the one.

yep that black box is the one.

 

Ta Jimmy - I'll have a look as soon as I get a mo. Didn't get chance this weekend as I was busy roasting to death at Silverstone...