My 02 rendezvous wont start after driving for a while. It'll start cold after three tries in the am but if I drive it for a little bit it'll turn right bck on after I turn it off. If I drive it for a long period if time n turn it off it just cranks n wont start git about n hour or so

The 02 monitor will reset after 300 miles of normal driving and must include One soak period of 8 hrs to reset all monitors, drive a little more, I hope this helps, take care. Merry Christmas.

My 02 Le sabre did that and my mechanic by passed the security and works good with out it. Like he said it cost more to repair than to replace an 02.

I had a car that did that to me, turned out to be the battery. It was getting old and needed replacing. You could clean the contacts for the battery as well, might help a little. My car ran for a hour or more but if I stopped and tried starting shortly after I was toast. Had to wait 45 min. or more to start. Hope this helps.

Might be your battery is not charger to it's fullness, or pump your gas one time it might not be getting enough gas, it's been cold try it.

Not a problem. I'm glad to help. As far as the vents, yes they run by vacuum. If the blend door or other door isn't opening or closing, you could draw cold air from one vent and warm in another.

Give it a try and let me know if you find anything. If you can't, I'll see if I can dig a vacuum diagram for the system ,may be you can find your problem
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The actuator that 'blends' cold with hot is stuck in the cold position. There are a couple of options. Disconnect the battery, then drive the vehicle around without using the AC for 10 min, if the AC is defaulted to come on after a battery interuption, then shut the car down then turn it on again. You are trying to get the electronic actuator to reset and resume proper function. Another option is to try this: Start the car, adjust the pax side full hot, drivers full cold, wait 30 sec then shut car down, then start car back up and reverse the settings, pax full cold, drivers full hot. In both solutions, the vent actuators are stuck at either the full open or full closed, so you are trying to get it to 'self check' and allow them to resume proper function. After two years, I simply removed them altogether since I live where it is hot an only need cold.works just fine....

My suspicion is a starter going bad. Sometimes when starters get old and worn they will start good when the engine is cold but not when the engine is warmed up. Did you perhaps notice that lately is seemed to drag when you tried starting, especially warm or it seemed to crank a little slower? I'd replace the starter. Hope this helps.

Best case, switch or loose connection'
Worst case. starter/solenoid. Starter itself could be loose.

Hello,it seems your car wont stay warm while driving, this is going to be a rather easy and inexspensive fix the thermostat is going to be stuck open. You need to replace the thermostat. Thank You