I replaced the resistor pack 2x, 1 didn't work, 1 still only works on high. NO LIGHTS were ever on ecc, I bought car a month ago. There is a TSB # 87812 for ecc wiring, I guess it's for using 1994 up ecc in 93 but can't find out from dealer. I don't want to burn up another one without confirming. This one I took apart to look for bad solder joints, 5 capacitors and the board are are melted! AC starts out COLD , gradually getting warmer and cycling more, but have no contol over it. I'm in Florida, Volvos don't like the heat down here!
[8D]

 

You might have to replace the blower motor as well.Most of the time when the resistors go bad it is from a bad blower motor.

Where in FLA are you from?

 

I'm in Orlando

 

Me to Pm me with a little more info.

 

I replaced the ECC with a FREE one a couple days after original post, everthing work s great even weeks later, a blower resistor is NOT the only thing that will cause a high speed only fan, checked my other blower res. all speeds work on them also. However I did find the TSB for wiring on the eec \ blower for a 1993 850 obviously some problem exists. In Orange county, Florida we can access ARRC (auto repair reference center) online through our library - it requires a library card and pin to access.

 

Does anyone have the info contained in TSB87812?
I believe it's a jumper that has to be intalled on a connector on the ECC.
If anyone knows how to do this, please help!!

 

There is a TSB 87812 located on the AllData.com sitebut I believe that you'd need a subscription to actually veiw it :-(

Sorry I can't be of more help.


[sm=icon_cheers.gif]

 

Please forgive my ignorance - but what is TSB 87812?

 

AllData.com has TSB (Technical Service Bulletin) 87812 = A/C - ECC Control Module Wiring Modification.

I am not a member of AllData so I am unable to access the information.

This is the link, but again, you will need a subscription.
http://www.alldatadiy.com/TSB/64/946409a9.html


Again, sorry I can not help you more.


[sm=icon_cheers.gif]

 

I recently purchased a '93 850 w/ ECC. I had the "no control over ECC" "fan stuck on high heat" issue. After replacing the power stage (resistor pack) and turning the ignition on, the fan would come on for a half of a second and then turn off, still no control over the ECC and the illumination on the ECC unit would turn off when the headlights were turned on. I replaced the main ECC unit with a salvaged one out of a '94 850 and everything started working. A/C is not that cold but I think it may just need recharged. Total cost me a $40 power stage, a $40 ECC unit, an hour under the dash board and an hour round trip to pick up parts. Nice.

 

Has any one figured this out?

 

Where can I find a replacement ECC? I have a 95 850 T5-R. Is this the unit that fits in the panel or a different controller?

 

if your unit has the green inputs on the back, which it probably does since it is a 95 850, you can easily find a bunch of replacements on ebay. we are talking about the control unit, the thing where you pick the temp you want the car to be and control the fan speed and so on. just ebay volvo 850 climate control and you'll find plenty of replacements.

 

[quote=Quick Brick;107810]There is a TSB 87812 located on the AllData.com sitebut I believe that you'd need a subscription to actually veiw it :-(

Check with your library. Some libraries pay for the AllData service and it's free to patrons. You don't even need to have a card here in Dakota County, MN. It's loaded on the same computers you use to look up a book. You just need to switch over to "Electronic Reference" on our system but if we have it others must have it too.