I recently bought an 02' Buick Rendezvous and immediately had to get the Manifold gaskets changed. A couple days after I picked up the car, I noticed the Temperature gauge fluctuating. On The freeway, the temp gauge would stay around the 1/4 mark, but when stopped on city roads or at lights, the gauge will constantly creep up until it reaches the 3/4 mark, and then slowly go back down to the 1/2 mark. Can anyone tell me any ideas of whats going on??? Also, last night the Service Engine Soon light came on while driving on the freeway.
Thanks In Advance
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