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Re: No heat when not on throtle... COLD...
Intake gaskets can leak internally causing the oil level to rise. When this happens it leaves a "milk shake" looking goo on the underside of the oil fill cap. It usually causes the lifters to make noise, especially when the engine is cold also. As MT mentioned, top off and bleed air out, then pressure test and watch closely for pressure to drop.
If the intake gaskets are replaced with the factory style plastic frame and silicone rubber seal, they will leak again, guaranteed. Felpro makes a steel frame gasket with a rubber seal that, if installed and torqued properly, will not leak. The Felpro part number is MS98002T.
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