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| Orifice
Tubes |
Q:
What about TXV's and expansion valves? Can they be checked?
A: The answer really depends
on which type of expansion valve your auto A/C system has. The typical type
expansion valve that has an external capillary tube (where the sensing bulb
is usually attached to the evaporator outlet) can be tested. The test process
is to remove the sensing bulb (gently). Use caution so that you do not 'kink'
or bend the tube. With the A/C system charged and running, FREEZING the sensing
bulb should cause the low side pressure to rise over 45 p.s.i. WARMING the
sensing bulb should cause the low side pressure to drop to zero and possibly
vacuum. For a valve to be considered 'good', BOTH pressure gauge reading
conditions must be met. |
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only 'perpetual' A/C service manual that is constantly updated! Best of all,
it's free! |
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so please visit back often. If you can't find the right answer here, visit
the auto A/C help
and discussion board at the COOL ZONE. You'll get all the right answers
to your questions about troubleshooting and diagnosing auto A/C systems. |
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This
was probably one of the best books on recharging air conditioning that I
have seen...
