Too Many Z are driving around with T-Stats, and are working Properly.. We need to figure out why Your Z is Running Hot.. Bad Fan Clutch, Electric Fan Controls. Bad T-Stat. Bad Radiator. Radiator Loosing Water because of Bad Cap. Water Pump Lost it's Impeller. Block is Clogged. Timing is Retarded. These are the Usual Suspects for Heating Issues.. You have already checked/Replaced the T-Stat.. What Else on this list have you checked. Cj
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