Why is my thermostat on heat but blowing cold air?
Your furnace may be blowing cold air because the filter is too dirty. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat exchanger does not crack.
Why does my heater only work when I drive fast?
Heater only works while driving is a classic symptom of low coolant level, which would then lead to overheating as it gets worse. You may have head gasket damage from overheating, that will blow the coolant out of the radiator.
Why does my heat pump keep blowing cold air?
To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. If it’s dirty, change it! Make sure the thermostat is set to “AUTO”, not “ON”. When set to “ON” the fan will stay on even when your heat pump isn’t actually heating. This could make it feel like cool air is coming out of your vents.
What to do if your heater is blowing cold air?
Coolant level: If your coolant level is low, your heater core may not be getting enough warmed coolant through it to produce adequate heat. Solution: Top up the coolant and see if it helps. If the level is low due to a leak, track down the source and get it repaired.
Why is the heater in my car blowing out cold air and not?
The problem with the heater on the Vauxhall Corsa (as well as the Renault Clio) is often that there is no power from the heaters at all. This issue has nothing to do with cold air coming out instead of heat. This loss of power is also a common issue on the Renault Clio.
What happens when a thermostat is stuck in the open position?
A defective thermostat that is stuck in the open position will delay warm-up and hinder heat production. A faulty thermostat can also make your temperature gauge read lower than normal and turn your check engine light on. Solution: Your mechanic can test the thermostat and replace it if necessary.