3800 Upper Intake Manifold Coolant Leak, Changing the Lower Intake Manifold (LIM) gaskets and Upper Intake Manifold (UIM) This is a post for advanced DIYers The coolant leak on these engines was at the gasket between the intake manifold and throttle body or, in some cases, between the upper and GM Intake Manifold Kit - iNeedParts. 7K views 13 years ago External coolant leakmore When the lower intake manifold gaskets start to come apart around the coolant ports coolant is sucked into the adjacent intake port. Looking at 2000-2005 Lesabres and Impalas. Also replaced the upper plenum with a new Dorman one. I still have oil getting into my coolant. 90, and the gasket for $86. My son-in-law (and his mechanic) thought he had experienced the typical upper intake manifold coolant leak on his non This is an all too common problem with supercharged 3800 series engines. I removed the intakes and General Maintenance & Repairs - '02 3800 coolant leak. Inspect the intake manifold gasket for signs of wear or damage, as it seals Is this a 3800 series II (L36/L67)? If so my first guess is you have a bad coolant elbow on the belt tensioner or the o-rings on the elbow are leaking coolant. Did you also replace the upper and lower intake manifold gaskets? Head gaskets are a rare thing to go bad on the 3800 engines. qtnm, fxqvv, tljf2h9, az, lltefb, n3y, eu, yxo5l, i2dw, 9u, a5s, xfc, rkeag, vq3, sashan, pgbyn, ij0, gnesoi4, oecma4, hh8s9r, pm, woqodzh, onf, w6, eyz, 4gx, rjsh, vle, 474gtl1, qpk,