Replaced A/C compressor and now alternator goes out the same day?

Asked by Jun 24, 2016 at 12:57 AM about the 2004 Ford Escape XLT

Question type: Maintenance & Repair

Okay, awhile back the compressor on my 2004 Ford Escape
locked up and snapped the belt while we were out of town.
But it was strange because it would lock up and then it
would spin freely and then lock up again. We were told the
bearings were probably bad. We bought another belt and
put it on (after the belt was changed, it had to be jumped
because the battery was dead also...? Didn't have problems
with the battery though...?) and left the A/C off to drive
home. (Which we barely made it, it burnt up the new belt as
soon as we made it home.) We got a new compressor and
my husband replaced it and put on a new belt. Then had to
jump it again to get it to start. Since we weren't able to
hook it up to a vacuum and put in the refrigerant right away,
he left the compressor unplugged and we left the A/C off,
and I was able to drive it for weeks like that. My husband
took it to a friend's shop and they plugged in the
compressor, hooked it up to a vacuum and put in the
refrigerant. When they went to start it, it wouldn't start, just
like the last 2 times, so they jumped it. He drove around
and drove home. Later that evening, went to leave and it
wouldn't start. Had a friend come jump it, but the radio and
other accessories wouldn't come on. Drove it around
awhile, came home and turned it off... Wouldn't start again.
Jumped it again, went to O'Reillys and had the alternator
tested, they said the alternator was only putting out 10
volts and that it was bad. All this happened the same day
that the alternator was plugged in and the refrigerant was
put in... Is this just a really bad coincidence? Or something
else?

1 Answer

95,245

Alternators are not designed to charge a dead battery, it burns them up in short order, have the charging system throughly checked you may have battery that is starting to go bad so it is hard to charge by the alternator and it will cook the replacement alternator. I don't believe the A/C had anything to do with the starting/charging problem. Two separate problems.

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