Will a bad ecu cause this. Battery charges and runs fine but isn't keeping a charge. The Alternator has been tested and it is good. Battery will not discharge just sitting overnight or even for a week without driving. But when you do drive it and after a couple days of driving to school and back it goes into snow mode and when that happens I have to put in another battery fully charged, then alls well with the car.
Scan it for Codes! IPD has a Scanner for $80 at ipdusa.
SOURCE: Volvo 240 wont hold charge
if with the volt meter the amps go down while running and at increased rpms than your alternator is not charging right
SOURCE: ok I have a 85 volvo 244 dl 2,3 is there a
THERE IS A SENSE CABLE CONNECTED TO THE ALTERNATOR, UNPLUG THIS CABLE AT THE CONNECTOR THEN START CAR, IF THIS DOES NOT HELP , IF THE CHARGE WARNING LIGHT COMES ON WITH THE IGNITION , BUT IS SLOW TO GO OUT WHEN THE ENGINE IS STARTED , THIS MAY INDICATE AN IMPENDING ALTERNATOR PROBLEM IF SO REFER TO AN AUTO/ ELECCTRICAL SPECIALIST.
SOURCE: Rplacing an AC compressor on a 2002 Volvo S70
will be ok compressor will not operate until system is gassed pulley will just freewheel . the oil will be put in when system is gassed a pressure switch in the air con pipe prevents it operating until at correct pressure
SOURCE: 1990 240 dl Volvo wagon, have to put fully charged
sounds as though you have a bad alternator or a loose alternator belt and the battery is not being charged. while the car is running - check the voltage from the alternator and make sure it is about 13.4 volts DC.
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