One problem related to water pump has been reported for the 2002 GMC Envoy. The most recently reported issues are listed below.
Everything started April last year and its one thing after another since. First my engine started stalling, while driving. One incident, I lost half a tank of gas within a 15 minute ride, which I have a 17 gallon tank. Then while driving on an expressway, it suddenly dropped from 70 to 20 before I could get over two lanes to get out of the way of traffic. Ive cleaned the throttle body, ive cleaned the camshaft actuator, ive replaced the air filter, fuel filter, and the oil twice within a 8 month period, and yet it still continues to stall. Now I recently change the water pump to see if that would help, even though my car was not over heating, now its stalling even worse; I cant even make it through a drive through without having to start it twice. Second and even scarrier issue, I hit pot hole one day and before I could make 15 miles, I heard grinding. A cv joint had to be replaced, then two days after that the other cv joint broke off and broke my front axle disconnect assembly. Did I hit anybody? no thank god I was in the right hand lane and could get over without hitting anyone or causing injury to myself. Ive replaced both cv joints and the assembly now and even did the struts while I was at it, but have also been told I need control arms now. And still my car is stalling, grinding when I turn and I cant get the check engine light to clear long enough to get it inspected. My drivers side windshield works when it wants to and now the car is starting to vibrate unbelievably. Ive kept my oil changed, ive kept my filters changed, ive never taken this thing off road and have had it over 7 years and just in the last year I have dumped more money in this car than I have since ive owned it.