A/C starts intermittently or @ high speeds only.
My wife's Nissan sentra a/c is acting up.
After ignition and starting vehicle a/c will
sometimes work, sometimes not. If it
doesn't come out when car starts she has
to drive at high speeds, a/c will come on
slowly, then full force or to dial setting. She
has already replaced blower, that wasn't it.
Could it be blower relay?
Why would this happen?