matt45 1 Report post Posted June 20, 2010 Hi all, So i had my heater valve replaced during the week and it was working great up until Saturday night. Now the issue i'm having is its not blowing hot air, but it seems like the control unit rather than the heater tap because when in auto mode and set to 32 deg. it does not seem to think it is necessary to turn up the blower (even tho it is freezing). Having said that when i manually put the heater on it doesn't blow hot either, which would imply the heater tap has issues again. any ideas? here is a youtube link to a vid i took of it in operation: Thanks. Quote Share this post Link to post Share on other sites
JaseNZ 53 Report post Posted June 20, 2010 If you need xtra info about your heater cores and what they are doing then check this out. For those of you who's with the E36ers and would like to know the what the HVAC codes are, check this out: HVAC Hidden Test Functions (Climate Control) - E36 -------------------------------------------------------------------------------- The HVAC (Heating, Ventilation, Air Conditioning System) of the 1996 E36 has a feature allowing different sensor values to be displayed on the control panel. To Access the Display Function: Press the "AUTO" and "REAR DEFROST" buttons simultaneously. 12 displays are available. Toggle through them by pressing the fan rocker (+ or -) switch. Number Test Function 1 Interior Temp Sensor 2 Exterior Temp Sensor 3 Left Heater Core Sensor 4 Right Heater Core Sensor 5 Evaporator Temp Sensor 6 Engine Speed Input 7 Road Speed Input 8 "Y" Factor Value 9 Fresh Air Flap Position (%) 10 AUC Sensor Voltage 11 Battery Voltage 12 Software Version To Exit the Display Function: Press the "RECIRC" and "AUTO" buttons simultaneously, or Turn off the Ignition. Note: 1. Decimal Points are not shown, Hence 75.5% is displayed as 755. 2. All Temperature displays are in ?C (Centigrade). 3. Negative values are indicated with minus sign Hope this will be useful... :yes: Quote Share this post Link to post Share on other sites
matt45 1 Report post Posted June 20, 2010 If you need xtra info about your heater cores and what they are doing then check this out. yea i did find that but when i try on mine (pressing auto and rear window defogger) it doesnt do anything ... have tried with car on and off and holding them for long and short periods of time, so don't know why it isnt bringing anything up ... googling around revealed that a few other people wern't able to to get it to come up either. Quote Share this post Link to post Share on other sites
JaseNZ 53 Report post Posted June 20, 2010 hmmm ok, It worked on my 1996 sedan when i had that. Quote Share this post Link to post Share on other sites
matt45 1 Report post Posted June 20, 2010 hmmm ok, It worked on my 1996 sedan when i had that. mine is an import if that makes any difference? have just gone out and tried it again .. still nothing Quote Share this post Link to post Share on other sites
JaseNZ 53 Report post Posted June 20, 2010 Mine was an import as well. May depend on the software version of your unit. Quote Share this post Link to post Share on other sites
matt45 1 Report post Posted June 20, 2010 Mine was an import as well. May depend on the software version of your unit. bugger Quote Share this post Link to post Share on other sites
*Glenn* 854 Report post Posted June 20, 2010 Is it air flow/volumn off air thats the problem, or temperature coming out ?? Quote Share this post Link to post Share on other sites
matt45 1 Report post Posted June 20, 2010 (edited) hi glenn, main problem is it has stopped blowing hot at all (again) secondary problem/suspicion is that when i set it to a hot temp in auto mode it doesn't seem to think its necessary to increase the fan speed which it normally would. edit: i can manually increase the fan speed however Edited June 20, 2010 by Matt45 Quote Share this post Link to post Share on other sites
*Glenn* 854 Report post Posted June 20, 2010 Did you fit a new heater tap or a 2nd hand one ??? What temperature does the engine run at and do you have any coolant loss issues ?? Quote Share this post Link to post Share on other sites
matt45 1 Report post Posted June 20, 2010 Did you fit a new heater tap or a 2nd hand one ??? What temperature does the engine run at and do you have any coolant loss issues ?? 2nd hand Supplied and installed by Ray, was working fine for just under a week. No coolant loss issues, temp on dash always stays dead on half way once it has warmed up. Quote Share this post Link to post Share on other sites
matt45 1 Report post Posted June 22, 2010 another point to add is that the heater tap is hot to the touch once the car has been running, not sure if this implys coolant is going through it or not? Quote Share this post Link to post Share on other sites
*Glenn* 854 Report post Posted June 22, 2010 another point to add is that the heater tap is hot to the touch once the car has been running, not sure if this implys coolant is going through it or not? Could still be the second hand tap or the control unit. Easier to take the tap off and check to see if the diaphrams have collapsed and check switching operation with the tap still connected electrically. Quote Share this post Link to post Share on other sites
matt45 1 Report post Posted June 22, 2010 Could still be the second hand tap or the control unit. Easier to take the tap off and check to see if the diaphrams have collapsed and check switching operation with the tap still connected electrically. thanks glenn will give that a go. Quote Share this post Link to post Share on other sites
