[teecee]

Thank you for your response.Please allow me to further explain my situation.
The entire system is well over 20 years old.We have a contract with AHS
(American Home Shield) and on friday they sent their contractor out to replace
a burned out fan motor in the outside compressor unit.We paid the $55.00 service fee and the installer strongly advised us to have the "A" coil and
blower chemically cleaned.(thus the $500.00 plus estimate).The a/c worked
fine until monday 4/17. Today 4/19 AHS sent their man out who replaced a
burned out compressor. This new guy took a look at the "A" coil inside the
house and also said it was very dirty and needed cleaning to get the greatest
benefit from my a/c. My service agreement with AHS stipulates that any item
that would normally be covered must show no sign of neglect on our part and
in other words, if for instance the compressor should fail they would not be
obliged to replace it unless I show proof that the coil etc. was cleaned prior
to the failure.
Several years ago when we felt the a/c wasn't cooling sufficiently,a friend
suggested I purchase a certain chemical spray and with all power turned off,
I sprayed this foamy stuff all over the blower and coil and allow it to soak in
and run off. It worked amazingly well.Now I can't remember what it was or
where I purchased it.I would appreciate any info on this that you or anyone
else can provide.Thank you for taking the time to help.