|
|
|
#1
|
|||
|
|||
need help with a/c on 1980 300SD
Hey all, in my continuing 300SD adventure, we have finally got the transmission and starting problems solved so we can go on to more important things...air conditioning in the south for the summer???
My a/c system only gives defrost (and damn well) but absoluting nothing when on the heat or a/c settings. No blower activity no temperature differential, NOTHING. Any ideas as to were to start? Ive read back a good ways on the forum threads and found nothing that sounds like my problem. |
#2
|
|||
|
|||
get at the blower motor plug.. check for voltage through all the settings on the control unit. it is important that you do this when the engine is up to temp, cause anything other than defrost should not work when the engine is cool.
if you are not getting any voltage then your CCU needs to be soldered up probably. if that does not work then you need the box under the hood replaced. if you are getting voltage it might not be enough to get the blower spinning. check and report back
__________________
-Trevor OBK #12 1980 300SD 333,XXX miles - Totaled 1986 Mazda RX-7 212,XXX miles - impounded and auctioned off 2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto |
#3
|
||||
|
||||
IIRC, your car also has the servo. Check that as well, and check all your fuses. Do you get and blower activity in any of the other settings? Does the A/C system have a sufficient freon pressure?
__________________
RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
#4
|
|||
|
|||
Quote:
but i am assuming the blower is not working at all except for defrost as he said.
__________________
-Trevor OBK #12 1980 300SD 333,XXX miles - Totaled 1986 Mazda RX-7 212,XXX miles - impounded and auctioned off 2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto |
#5
|
|||
|
|||
Blower is not working on anything except defrost and at any engine temp. Turning the dial from heat to cool does nothing and and high to low makes no difference, but turn on the defroster and blower speed is great, and plenty of hot air. There was ice on my windshield this morning and the defroster had the whole windshield de-iced in a matter of minutes.
|
#6
|
|||
|
|||
okay so you need to check out the blower first.. the plug for it is way to get to... passenger side of the car take the kick panel of it should be on the outside of the car right there
one thing at a time here.
__________________
-Trevor OBK #12 1980 300SD 333,XXX miles - Totaled 1986 Mazda RX-7 212,XXX miles - impounded and auctioned off 2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto |
#7
|
|||
|
|||
So did you ever get the issue of the blower motor resolved? My 1980 300sd is doing the same thing and I need help.
|
#8
|
|||
|
|||
Vacuum, Vacuum, Vacuum
I know this post is super old but I will post for future seekers.
If your Climate Control does NOT work in any mode but DEF then the first thing you need to do is make ABSOLUTELY sure that you DO NOT have a Vacuum leak ANYWHERE. The vacuum system on the W116 300SD is connected to just about everything. Making sure the vacuum system is leak-free is super important. When I first purchased my 1980 300SD the A/C and Climate Control did NOT work. The door locks did NOT work. I meticulously went through the ENTIRE car and found disconnected vacuum lines under the hood and bad door lock vacuum switches inside the doors. I plugged in a replaced everything that was bad and it all works fine now. So many problems solved just by securing the vacuum system. |
#9
|
||||
|
||||
on car with the servo system you have to make sure there are no vacuum leaks. There is a switch under the dash that will turn the blower off if the vacuum supply drops.
__________________
1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|