Re: Foaming coolant under heavy load, bad head gasket?
Change head gasket
While head is off, check/ clean water jacket.
Find an industrial hot water pressure washer with chemical degreaser ( most tractor repair/ truck shops have one) use the hot water to get the radiator hot (200 degrees plus) and flow the water/ degreaser back and forth through the radiator, getting it hot expands the tubes, the degreaser breaks down the grease/ dirt blockage.
Regardless of ambient temperature your car should operate consistently at 160 degrees..no “cool down” or reducing load required.
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