190E 2.6 A/C problems
 

This question has probably been answered. I've done my search but couldn't exactly find a specific answer that I'm comfortable with. I have a 1987 190e 2.6. It seems that my A/C works only when the weather temperature is cooler, like in the evening or early morning. It seems that when the car or weather is hot the A/C compressor doesn't come on and all I get is outside air. I know there are various sensors that this could be. Just wanted to limit to at least 2 before I start purchasing and replacing sensors. Hope someone can help!

Update
 

So far the A/C has been working fine. Since I replaced the OVP relay that fixed my starting problems( Thanks to Steve B.) its been working. I'm not sure if there's any relation, but its working. We'll see how good it works when the weather gets warmer.