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Is there a thermal vacuum valve on 1999 Ford Ranger?

No, a 1999 Ford Ranger does not have a thermal vacuum valve in the same way some later vehicles with more complex emission control systems do. While the Ranger uses vacuum for various functions (like the HVAC system and possibly some emissions controls), it doesn't utilize a component specifically *called* a "thermal vacuum valve" as a dedicated, identifiable part. The vacuum system is simpler.