I'd recommend having a look at the drive belts. If the a/c belt is
significantly cracked, it's likely not been changed in at least 4 years or
40k miles. Typically, the a/c belt begins to crack around 3 years/30k
If you have other belts beginning to crack, then it's likely it's been
If the drive belts haven't been changed recently, try to assess how long
they've been on the car and how long they would have been in poor
condition. Expect that if the drive belts were in poor condition, they
would likely have been replaced with the timing belt. And also know that,
in many cases, even if they look okay, the drive belts are replaced along
with the timing belt to avoid the labor cost at a later date.
But there's no way to know for sure without a record saying it's been
done, or having a person who actually knows give you the information.