turn off the A/C man. haha. that oughta get ek to its senses. ... just kidding. anyhow, consider following factors which increase load value on the engine:
- engine health
- oil status
- transmission health
- load in car
- bearings of wheels
- alignment
- air in tires
- exhaust system
but this is a general answer, not a specific one, u should hunt in this list thoroughly and will find the answer.