Drastically Reduced MPG
My spouse'* '03 GMC Envoy has a problem that is proving to be quite elusive. On 9/24 took to Dealership because car was trying to stall whenever a/c was engaged at idle. They replaced the throttle body which seemed to resolve the issue; however, my wife complained to me that it didn't feel right and within a few days couldn't get the car to go over 50 mph. I test drove it and everything appeared to be fine, except when I pulled back into the driveway it was leaking coolant. Back to the Dealership, replaced water pump and investigated problem. No codes being thrown, they're only solution was that maybe the brake calipers are sticking and causing friction (brought about by them having replaced the Power brake booster on 9/16). There is no evidence that this is the case. Meanwhile, the mpg has gone from averaging around 18 to averaging around 7. Dealership has now had the car in their possession for a week and have yet to determine the cause. My frustration cup overflows! Can anyone help me, please? Oh yeah, almost forgot to add that the cooling fan now appears to be in need of replacement.
Last edited by LastDitchEffort; 10-30-2014 at 10:06 AM.