i hope somebody answers this because mine does this too. i just recently turned on my heater (my blend door is messed up so i manually have to take it out and adjust it to blow heat, and im not gonna mess with it again until next yr lol) and im just burning up driving down the highway

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2004 ford ranger 2.3 2wd. flowmaster 40. sony xplode head unit. 30x9.50x15 turbostar ATs. stock jeep wrangler wheels, painted black. ebay taillights. few more cosmetic upgrades