III-83
Use your knowledge and experience. Ask yourself what could have caused a lack of
cooling in that rig! Did the compressor drive belt break? Did a pressure switch or
relief valve cutout the compressor because of high or low system pressure? Does the
switch or valve in this type of system reset itself? Could there be a superheat switch
and thermal limiter with a melted fuse. Did someone else service the system recently
and put in too much refrigerant?
Could there be contaminants in the system blocking the expansion valve (expan-
sion tube)? If there is a leak, why and how did refrigerant get out of the system? You
know if refrigerant can get out, air and moisture may get inside as well, especially if
the leak is on the suction side of the system. Could there be a restriction to refrigerant
flow in one of the high pressure lines because of a kink? From your knowledge and
experience, you already know about these possibilities and others when you talk to the
operator (before he has the chance to leave).
The right kind of questions can speed up troubleshooting and your service work
by pinpointing the problem(s) that needs fixing. Your conversation with the operator
might be as follows:
•
H
o
w
l
o
n
g
a
g
o
d
i
d
t
h
e
A
C
s
y
s
t
e
m
s
t
o
p
c
o
o
l
i
n
g
?
Answer: About an hour ago.
• What steps did you take when you noticed the lack of cooling?
Answer: I put it on maximum cool.
• Then what did you do?
Answer: When it wouldn·t cool, I opened the window and turned
the air conditioner off.
• Is this problem new or has it happened before, and when?
Answer: In the last few days I·ve had problems with cooling off
and on—this is the first time it·s happened when I was close to a
place that did AC service.
• Do you get any cooling at all?
Answer: Yes but it seems to quit after a while.
• Do you still get air flow at the vents from the blower?
Answer: Yes.
• When was your air conditioner checked thoroughly?
Answer: Before I bought the rig last May (a year ago).
•
H
a
s
t
h
e
h
e
a
t
e
r
b
e
e
n
u
s
e
d
r
e
c
e
n
t
l
y
a
n
d
d
i
d
i
t
w
o
r
k
O
K
?
Answer: Yes.
Troubleshooting & Service Procedures
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