With my "new" 855 TDI 1996 came also an Eberspächer Hydronic(?) preheating system, which burns fuel to heat up coolant and passenger room, starts ok with remote control TP 48, is about 8 years old, I presume. The coolant is being heated perfectly, the heater fan for the passenger room does not start though. I think there is an extra heater fan relay built in with the preheating system. Where should I search for it, what does it look like? Fuses are ok. Heater fan works ok with genuine heating system of the car. Thanks for any input. Viktor
"Per Groth Ludvigsen" schrieb im Newsbeitrag news:45a7c334$0$13993$ snipped-for-privacy@dread15.news.tele.dk...
Hi Per, thank you for your input. you asked
I think it is ECC, if it means a heating/cooling automat, where you set only the temperature and the system decides how to achieve it. Fan automatically adjusted, directions of air flow automatically etc.
I have had (and actually still will keep it as a summer car) a 1989 745 TD, where there is plenty of room under the bonnet. Now looking into the new car, there seems to be no space left for insertion of hands and fingers :-) . Where is the cable tree you mean? Going from the battery into the depths ...?
The cable tree goes from the heater unit to the battery via a relay and a fuse box and to the timer inside the car - if you have such installed. Further - on my car only one cable is connected to the ECC control unit, the one above the radio, where you adjust the temperature etc. There are 3 plugs and in one of these plugs a cable from the heater is connected. This cable control the fan in the car!!
"Per Groth Ludvigsen" schrieb im Newsbeitrag news:45a7d9c0$0$13997$ snipped-for-privacy@dread15.news.tele.dk...
There is a timer, set to 60 min heating period. If the car is not started within this time, the preheating system shuts itself down, I read on the little leaflet which came with the remote control. I also can hear a timer tick after starting the heater by remote control. The fuse box of the heater with three fuses is right besides the battery under the hood. Maybe only one of the fuses is for the Eberspächer heating system. I was at a repair shop to have them have a look on my system to know whether it really should be able to heat the passenger room. The mechanic checked the first of these 3 fuses and said that it is ok. I myself checked the other two, they are also ok.
So the relay should be under the hood and not inside the passenger room, if I understand correctly.
I have also asked at a German language Volvo website
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about this problem. Somebody answered that at his car the passenger room fan starts only when the middle air distribution control knob is set to blow to the screen. That was a "dirty hands free" try, unfortunately it did not work. At which position do you keep the air distribution knob when you want the passenger room preheated? And the other knobs? Unfortunately I do not (yet) have a manual for the Eberspächer heating system but will try find one.
I tried to find out, what is where and have located a suspect for the relay, which might be the one:
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?? The text on it is Siemens V23134-A1-X65 12V R 61-15. The Hydronic heating unit seems to be under the battery?
Is that the heater relay?
Then I had another idea. Could it be that the passenger room heating fan is started only at temperatures below zero or near zero? Since at the moment we have only a "calendar"-winter, and not a climatic winter, the heater might not see any reason to start heating.
I have the installation manual for the Volvo 850 TDI and I will check the wiring when I find it. The fan starts to run when engine temp. is higher than 30 - 40 celcius, this is controlled by the heater and has nothing to do with the buttoms position on the ECC unit.
I get varying info on that stuff. I contacted the previous owner. The heater has been installed by a non-Volvo electric shop later. The previous owner kept the recirculation switch always on and turned the fan on 1/3 manual speed. One guy told me, his 855 preheater starts only when the middle knob is turned to the screen...
If you could send me the wiring, that would be terrific.
In order to help you better could you find out what number and year your heater has? Mine is a Hydronic D 5 WS - with external waterpump and external control relay. Did not find the wiring but I checked how I connected mine as I bought mine on Ebay in Germany and installed it my self using the Eberspächer installation manual for Volvo
850 TDI.
be out of order. Is the electrical water pump running when the heater is running?
The cable (on mine - the color schwartz/violet) from the external relay pin
30 that controls the fan has voltage supply via a 5A or 25 A fuse on relay pin 87. This fuse is located as one of the 3 fuses in the Ebersbächer fuse box. The sw/vi cable from the relay pin 30 is connected to the A2 plug on ECC unit, in this plug it is connected to pin no. 2. When connected this way the fan start to run as soon as the engine temperature is around 30 - 40 celcius, the knops on the ECC unit has nothing to do with this fan control.
"Per Groth Ludvigsen" schrieb im Newsbeitrag news:45a92c4f$0$13987$ snipped-for-privacy@dread15.news.tele.dk...
Hi,
don´t worry about the cabling any more: I was surprised I received the installation instructions as PDF-file from Eberspächer today for what is probably in my car. The relay I suspected originally really IS the relay for the heater fan. Now it should be possible to sort out in which part of the system the fault is. I also now realized the little digital clock inside, which I believed to be just a normal l little clock. It is the manual timing system clock. It was not operating, probably after having removed the battery from the vehicle.
So I will check next whether the primary circuit relay connections 85 (ground) and 86 (+ through some kind of thermosensitive resistor). That should be dead or low voltage when coolant is cold and get alive enough to operate the relay solenoid when coolant reaches about 30 degrees centigrade.
"Per Groth Ludvigsen" schrieb im Newsbeitrag news:45a92c4f$0$13987$ snipped-for-privacy@dread15.news.tele.dk...
Now that I knew how the relay is working, I took it out and checked its function on the workbench. It works fine, unfortunately. Changing the relay would have been the easiest job.
Should not bypassing the relay and applying 12 V+ on connector 30 of the relay seat also make the fan move? Or is there some other fan regulating temperature dependent system still working? This morning I had the timer set to start 45 min before I left, the fan set to maximum, the rest on auto, the temps on max. The engine coolant thermometer showed a temp about one third up the scale when I turned the key. So the engine coolant was heated ok. When I started and drove, the ECC did not start the heater fan until the coolant temperature had still risen more. I will try to find in the VADIS how that should work.
"Per Groth Ludvigsen" schrieb im Newsbeitrag news:45ae6c23$0$13994$ snipped-for-privacy@dread15.news.tele.dk...
I have done these checks myself today with a completely cold vehicle after work. I get 12 V on the line after some heating.
I did not do that. This bring to my mind - one reason why the relay might not work when being in place could be bad ground contact. I will check that.
What I also did - I bridged the relay secondary circuit, that means 30 and 87, that should give 12 V to the line to the ECC unit and start the fan. It did not. I will next try to find out where the connector A2 (which should transmit the impulse to start the fan) on the ECC unit is - if somehow easily accessible I will check whether it is in place and whether any voltage arrived there. I am not yet ready to give up and go to the shop. Who knows whether we will have temperatures below zero this year any more...
The Vadis says in its section on the Ardic inbuilt parking heater: The control unit is fitted with a connection (A:2) for connecting a digital parking heater. When the heater is switchen on, the ECC control unit receives a signal from the timer and the following outlets occur when the ignition is switched off: The fan starts and is supplied with a voltage of 4,6 V. With the air distribution control in the aut setting, air distribution is the same as in the floor/defroster setting. Recirculation is activated so that 90% of the air is taken from the passenger compartment Both temperature control dampers are set for max. heating.
I comprehend that the fan should start regardless of the settings of the controls on the ECC-unit. I do not understand what they mean with "digital" parking heater. It seems to be just enought voltage or not on the line to the ECC unit, no bus line.
Digitally could mean on/off. It seems that the Ardic heater is connected the same way as mine; plug A2 - pin2 in the ECC unit. There should be 12V on this pin from the trigger in heater via the relay and when this happens you will see the diodes for recirc (when on) and aircon go red and the fan starts to blow.
"Per Groth Ludvigsen" schrieb im Newsbeitrag news:45ae8b71$0$14011$ snipped-for-privacy@dread15.news.tele.dk...
I will put 12 V directly from the battery to this line and see what happens. Should the fan start regardless of outside temperature? I
I have had a look at the UK-website of Eberspächer. They offer much more than the Austrian website, which I have used up to know. They have at
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a detailed documentation for installation, not available at the German and Austrian website. Very informative. There is also on page 19 the unit (2.15.9) - an outside temperature sensor. I could not find out, how the outside temperature influences the function of the heater. The factory installed parking heaters (Ardic?) heat up for a shorter time when the outside temperature is well above zero. Maybe the Eberspächer heater outside temperature sensor causes the same? Maybe I will have to wait until next "winter" to find out. Viktor
a detailed documentation for installation, not available at the German and> Austrian website. Very informative. There is also on page 19 the unit (2.15.9) -> an outside temperature sensor. I could not find out, how the outside temperature> influences the function of the heater. The factory installed parking heaters> (Ardic?) heat up for a shorter time when the outside temperature is well above> zero. Maybe the Eberspächer heater outside temperature sensor causes the same?> Maybe I will have to wait until next "winter" to find out.>
My guess is that there is no outside temp sensor - normally extra in connection with heater controlled fan function oly in the hot summerdays.
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