WebSOURCE: A/c and heater air blows only in windshield vent That means you lost your engine vacuum source and defroster mode is the default position. Check for the vac. line coming off engine to the firewall under hood if that vac line isn't damaged or leaking,check under dash allthe way up to the vacuum selector switch for the HVAC if you have good engine vac at … WebNov 8, 2024 · If the heater is still blowing cold air, it could be because of other issues. #7. Heater Control Issues. Sometimes the car’s heating system works perfectly, but it still blows cold air. It can be because of heater control issues. The heater control valve works to regulate the flow of hot coolant inside the heater core. It can get clogged with ...
Heater Blowing Cold Air? Here
WebNov 19, 2008 · iflyabeech. Hey there...My wife's 2005 grand caravan sometimes blows cold air with the heater on, and engine warm, the air is not hot at all. it does blow air though. Sometimes it blows hot air like normal, but usually it doesn't work. Same for both rear A/C and front A/C. The coolant level is normal and the engine gauges show normal … Web2024 Tucson My heater blows cold air up to 27 Celsius Over that it blows hot, No leaks no over heating, 50,000 km, Not - Answered by a verified Hyundai Mechanic. ... the heater on … how to study for the postal exam
Central Heating System Blows Cold Air: What to Do?
WebDec 4, 2009 · 6 Posts. #2 · Oct 16, 2009. Only show this user. probably the hvac flap, (or whatever it's called) which is vacuum actuated, or the "blend door" letting in only air from outside. when the heat dial is halfway between full hot and full cold, the "blend door" is somewhere in the middle, letting in air from outside as well as heat from the heater ... Web1. A Bad Water Pump. If the condition of your water pump is not good, in that case, it may also lead to your heater blow cold air at idling because this part circulates the coolant through the cooling system. When the rotor cannot create sufficient flow, the heater blows cold air at idling, and when the car starts moving, the air starts getting ... WebJan 27, 2024 · Jan 7, 2024. #8. The heater core is the high point in the cooling system. Only takes a little air bubble to air lock the water flow through the heater and kill idle heater performance. The water ports in the engine are large enough that at idle the water pump can't push that air bubble out. reading enhancement activities