radiator<\/a> and overflow. Next, once the engine is brought up to operating temperature check the heater hoses going to the firewall. If both hoses are hot the problem most likely is with the blend door function. This is inside the HVAC box under the dash. If the temperature blend door actuator or the blend door itself is stuck, no heat will be felt.<\/p>\n","protected":false},"excerpt":{"rendered":"I replaced the thermostat and radiator cap but no heat. why? RESPONSE Did it have heat before you replaced these parts? Did you properly bleed the cooling system after replacing these parts? Is the coolant level full? No Heat Diagnostics First thing to check would be the coolant level in the radiator and overflow. Next,… Read More »No Heat 1999 Chevy S10<\/span><\/a><\/p>\n","protected":false},"author":14195,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[1,3],"tags":[75,412,9505],"class_list":["post-37841","post","type-post","status-publish","format-standard","hentry","category-auto-repair-questions","category-chevy","tag-no-heat","tag-s-10","tag-s10"],"yoast_head":"\nNo Heat 1999 Chevy S10 - FreeAutoMechanic Advice<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2016\/12\/no-heat-1999-chevy-s10\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"No Heat 1999 Chevy S10\" \/>\n<meta property=\"og:description\" content=\"I replaced the thermostat and radiator cap but no heat. why? 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![\"1999](\"\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2016\/12\/1999-chevy-s10.jpg\")
I replaced the thermostat and radiator cap but no heat. why?<\/p>\n