Best Answer

The first possibility is the thermostat didn't work. To find this out, after the engine is warmed up u check the hoses going from the engine to the heater, they should be hot. if they are hot then the next reason would be a cable to the temp on the heater needs to be adjusted or the heater core is plugged inside or out.

User Avatar

Wiki User

โˆ™ 2005-01-08 13:06:26
This answer is:
User Avatar

Add your answer:

Earn +5 pts
Q: Why is only warm air blowing when heat is on full after putting in a new thermostat?
Write your answer...

Related Questions

Why is your heat blowing out cold air?

Replace Thermostat

The engine is overheating and you have no heat just cold air blowing?

Probably a bad thermostat.

Heater blowing out cold air?

Check the radiator for full coolant. Check the engines water pump and thermostat, as the engine coolant carries heat from the engine into the heater core.

Your 1995 ford E150 quit blowing warm heat?

Flush your radiator coolant and replace thermostat

Radiator keeps blowing water back over heats?

bad thermostat or bad heat gasket

Why is the heat and air system only working on emergency heat?

when running the heat-pump the air blowing from the heat ducts is not hot ( it's to cold for the heat-pump). you have a main furnace and it won't turn on ( is thermostat selected for this source), ( is the power switch for main furnace on ), ( is fuse for this furnace good). If these are good (check thermostat wiring at thermostat, and transformer).

Why is your 1999 F150 blowing cold air when the heat is on?

Low coolant? Defective thermostat? Heat control cable not adjusted properly? Heater core plugged or airbound?

How can you tell if the thermostat is going out?

Vehicle takes an excessive time to attain normal operating temperature Heat not HOT with coolant full - thermostat not closing properly Vehicle heats up too soon - No heat with coolant full Coolant boils out of reservoir or top of radiator - thermostat not opening

Your heat is blowing cold in your 2002 galant what should you try?

check your water or coolant level If coolant level is ok, replace the thermostat.

Why does your engine not heat up?

does the engine not heat up or does the car not blow out warm air when you turn on the heat?If the car is not blowing out warm air when you turn the heat on then you need to check your coolant levels. the heat will turn off if there is not enough coolant in the car.If the temperature gauge shows that your engine is not warming up you may need a new temperature gauge (thermometer)A2. Another source could be that the radiator thermostat is open all the time. This you may easily check by removing the thermostat from the radiator, and checking that it operates by putting it in some water which you bring to the boil.

What kind of thermostat do you buy if you have a heat pump?

A heat pump thermostat.

Your car not blowing air or heat what's wrong?

Car not blowing air or heat

2004 explorer rear heat not blowing?

heat and a/c barley blowing in back?

4.3 vortec running hot no heat or defrost?

try putting anti freeze in it, you may also need a new thermostat

Why would a 1995 Crown Victoria with the original thermostat only produce luke warm heat if the coolant is full and recently flushed?

Thermostat stuck open. Replace.

Why would a 1998 Dodge Ram have low heat while idling yet full heat when driving?

AnswerYup, in most cases. Check the thermostat.

I have a 1992 Chevy blazer my air works but my heat doesnt....i hear the fan blowing but no heat comes in?

If your windows fog up you thermostat may not register because you heater coil may be broken.

Why did my heater ac stop putting out heat on my 2002 Mazda B2300?

Is your radiator fluid full?

Where is the thermostat in a 1992 Nissan Quest or how do you replace the thermostat in a 1992 Nissan Quest?

Follow the lower radiator hose from the radatoro to the engine. The lower hose is attached to the thermostat at the engine. Are you haveing problems with the engine warming up but the heat not blowing as hot as it should? Consider the heater core.

The heat and front defrost stoped blowing hot air on your 1997 Nissan Altima The ac works fine Could this be the thermostat or is it the heater core?

check the antifreeze

What is wrong when the fan stops blowing out cold or warm air in a 1999 Hyundai Elantra?

the ac stoped working and so did the heat . I changed the thermostat added freant

What causes 94 Ford Probe to over heat?

First start would be to check the antifreeze and if that is full then I would check into the Thermostat and make sure it is stuck. If it is Full and heats up real fast then my guess would be the thermostat.

Jeep Wrangler has no heat?

What do you mean by "has no heat"? No air blowing out, blowing out cold air when heater is on, blowing nothing at all? Heater not turning on? What specifically is happening?

What could be wrong is a 1997 Chevrolet Blazer when there is little heat blowing?

Thermostat stuck open, clogged heater core, heater flow valve not functioning, or low of coolant.

What type of thermostat does a heat pump with auxilary heat use?

Any brand or make will work if it is 2 heat 1 cool thermostat