GMC Sonoma Problem Report
GMC Sonoma Coolant Leak From Heater Core
The heater core under the right side of the dashboard may leak engine coolant which can puddle on the passenger front floor. The loss of coolant may cause an engine overheating condition. Our technicians tell us that removal of the dash board is necessary to replace the heater on these vehicles.
Replaced heater core - 5 hours and 100000 screws later the heater core is replaced and my fingers are bleeding engine coolant. - MaxDaMonkey
heater wasn't working so disconnected it for a while. after reconnected, leaked massive amounts of fluid (about 1/2" on passenger floor) so disconnected it again. need to pull dash and fix as it's winter and no heat is no fun. - Visitor
Fluid leaking from under dash
Pulled the dash half out - Visitor
heater core leak in duct work spaying on windshield when blower engaged, leaking heater core replaced. - Visitor
coolant leaked onto passenger side floorboard.. estimate was $350-400. had to take apart dashboard - Visitor
I have to check coolant daily. The windshield has a permanent foggy, moist appearance. I am waiting for the weekend to fix it. It's Wednesday today. - Visitor
Transmission leaks oil from somewhere unseen on top of the case. It only does it after parked...
blower motor works and engine temp gauge is 180 with heat on high cdabin temp gets to about 70...
Vehicles using the enhanced vortec V6 engine may be hard to start run poorly and/or use to muc...
A cover plate on the front of the engine may develop a coolant leak, resulting in an engine ove...
The intake manifold gasket may develop and external engine oil or coolant leak. In some cases,...