new here need questions asked about 2002 grand cherokee
 

Well im new here just got a 2002 grand cherokee with a 4.0l got a few questions on problems I have going on first and annoying 1 is my heat!!! I can get really warm heat on the circulation mode other modes I barely get luke warm some people said it might be the blower motor going bad cause I had it on the mode where it is coming out of the dash vents. I was getting on the highway accelerating and the heat shut off then turn on again? Also the other problem is my car shakes a lil while in park and when I put in it in gear could be transmounts going bad? also the trans is kinda bad but replaceing it really soon. So please can u guys help me out I really like this jeep hope I didn't get screwed

If its shaking in I say probably motor mounts . the heat maybe the blend door isn't closing

I would look for a vacuum leak, it be the root cause of both problems. There should be a vacuum canister near the battery towards the front bumper, if it is cracked, it will effect the HVAC modes and could cause the engine to run a little rough.