• Antifreeze and Engine Coolant
  • Heater Cores and Blower Fans
  • Car Heaters

Why would the car heater not blow warm air?

User Avatar

Wiki User

βˆ™ 2011-12-16 08:56:52

Best Answer

First check the water level. If the water level is low or very low, you may have air in the radiator. If you have a small leak, you will have enough water to cool the engine but not enough to heat the heater core. Adding water to the radiator may not be enough. Air in the heater core equals no hot air in the cabin. This problem is so bad in some engine configurations that some cars go as far as to actually have a 'bleeder' at the front of the engine, by the upper radiator hose/thermostat housing (Dodge, BMW, etc.). The heat selector lever/ switch in the cabin may be defective (electrical) and may not open the hot water valve enough, or even be disconnected (mechanical). Some (Ford and foreign cars) use vacuum to operate the valve and those lines may be cracked, worn, pinched or just leaking. You could also have a clogged heater core. These are 3 possible items you could start with, in that order. The thermostat could be At Fault, but this is a give away. If the thermostat is stuck open or missing and you drive the car for a distance, the engine will take a while to warm up then overheat, and the cabin heat will follow the engine temperature. If the engine overheats, you need to take care of that motor more than worry about the heat in the cabin. As you said, you're not asking what to do with your overheating car. You would have taken care of that motor by now and taken care of your heater problem with it.

2011-12-16 08:56:52
This answer is:
User Avatar

Add your answer:

Earn +5 pts
Q: Why would the car heater not blow warm air?
Write your answer...

Related Questions

Why does your heater not blow out warm air?

if the heater does not blow out warm air change the setting.

Heater on but not blowing warm air?

heater on at idle and will not blow warm air. when moving it blows the warm air from the vents. what will cause this

Why is your heater blowing out warm air in your 1990 buick regal?

Isn't a heater supposed to blow warm air?

What would cause the heater on a 1997 Grand Am Gt to not warm up completely and only blow slightly warm air?

It could be the thermostat on the engine. If the engine does not warm up adequately the heater will never blow hot air.

Why would cold air blow out when you turn on the heater?

engine not warm, low coolant, or stuck thermostat

Can a thermostat cause your car's heater to blow warm air?


Why would a heater blow cold air at an idle and warm air while driving?

Low on coolant. Stuck open thermostat. Poor circulation (plugged heater core).

Why would the heater in a 2000 neon blow warm air but never get hot?

Faulty thermostat. Plugged heater core. Temp blend door malfunction.

Why would your heater blow cold air?

Your thermostat is most likely bad. It controls the flow of warm water into your heater core which warms your air. Its a common problem in winter and an easy fix.

What would cause a vehicle heater to blow warm air when blower on low but blow cold when blower turned up?

Poor coolant circulation from a plugged up heater core. Try flushing the heater core and replacing the thermostat.

What would cause a 2003 Buick Century's heater to blow cold air when idleing but will blow warm air when moving?

Probably need to add antifreeze. Check the Radiator not the overflow tank. If you are low on antifreeze it will not circulate through the heater core.

Why would a 2000 Saturn heater only blowing warm air?

it is a heater. heat. it blows heat. warm air

What would cause a 98 dodge 1500 4x4 heater to blow luke warm air?

Any heater that only blows luke warm air isn't getting warm or hot water to the coil. This sounds like a problem with the thermostat not closing, and allowing the engine to heat the water properly for the heater.

Why does your heater not blow warm air?

Heater core may be plugged . Flush the cooling system, also check thermostat.

What would cause the heater to blow only cool to warm air not hot air in a 2004 Chevy Impala?

It could be that you need coolant or it's low.

Why would a 1989 Mercury Grand Marquis only blow warm air on the low speed setting and not on any of the other speeds?

your heater core hoses could be plugged up and not letting much hot anti-freeze into the heater core then when you try to blow alot of air through it it cools the warm air off too much and you get not so warm air. try a cooling sytem flush

Why will the heater not blow warm air on a Chevy s10 pickup?

Check your anti-freeze levels

Why would a back heater blow cold air and front heater blow hot air in a 2003 Chevrolet Suburban?

The front expansion valve is clogged.

Why would a house heater blow out cold air?

It doesn't really blow it out it just warms the cold air.

Why does your central air unit blow cold air for only a few minutes then blows warm air?

why does ac blow warm air? why does ac blow warm air?

Why would a truck heater blow warm air and not get hot?

Check your coolant level. If its too low the sensor won't read the temperature of your coolant.

A heater is able to blow warm air that heats a room because of?

it's because of heat transfer into convection .

Why would you smell antifreeze and heater blow cold air?

heater core possibly plugged and leaking

Why does the heater not blow air?

The heater does not blow air because it emits infrared rays that have heat molecules within them, thus releasing heat, not blowing it. A heater does not blow air becasue there is no moving air source within the heater. The heater emits infrered rays that cause heat to slowly flow out of the heater.

What is causing your auto heater to blow cold air instead of warm or hot air?

dual control damper needs replaced how do you change it