Question:

car heater blowing cold even though engine is warm?

Live in NW uk had very heavy frost and snow started car this morning and left it running to warm up and defrost the car but despite it running for over 30 minutes the heat was still blowing cold even though the engine was warm. Help!
and how do i fix it?

Answer by grey square
Low coolant level

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10 Responses to car heater blowing cold even though engine is warm?

Enny Body says:

November 24, 2011 at 3:26 am

No doubt the hose to the heater is clogged.

Never idle more than a minute or two unless you want to ruin your engine.
Infernal Disaster says:

November 24, 2011 at 4:10 am

You car is heated by hot coolant flowing though the heater core, usually low-coolant level, a blockage or a bad thermostat is the cause of ‘no-heat’.
Jackie D says:

November 24, 2011 at 4:13 am

I have that problem with mine so got an extra heater. It is one that you plug into the cigarette area.

Another thing I’ve noticed is if you have the heater on for the window screen it tends to blow out cold air for some strange reason. But if I put the heater on for the feet area it does blow out warm air.

Maybe if it is directed at glass it the air has to be cooler.
texaswildman says:

November 24, 2011 at 4:27 am

have your thermostat replace.
Alfonzo says:

November 24, 2011 at 5:07 am

yea, check your coolant level to see if it’s topped off.
The heater core is plugged if you grab the heater hoses leading to the core. If either one is cold then the core is plugged. Otherwise you have some kind of blockage in the ventelation system (in dash) OR the doors that route the hot air (also, in dash) are disconnected/defective.
strt_stone says:

November 24, 2011 at 6:03 am

first off id check the coolant level and make sure that it has en off coolant in the SYSTEM and bleed the air out of the heater cori and then id start looking at the pump to make sure that it is circulating properly
CARL G H says:

November 24, 2011 at 6:39 am

the condition is likely due to a frozen control valve. its the valve the water hoses connect to usually close to the passenger side under the hood. its often cable operated and most are made of plastic. this valve regulated how much heated water is permitted to go into the drivers compartment to the heater core. when in A/C mode for instance the heater control valve is all but closed. when you turn on the heater you often slide a lever in the control panel to the red section the further to red the hotter. this is actually twisting the gate inside the valve and limitting the flow of heated water.
how to fix it?
depending on the access to the valve they are most often a matter of purchasing the valve , removing one at a time the hose clamps and hoses , installing on the new valve, removing the clamp holding the cable to the valve and refilling the system.
Jeremy S says:

November 24, 2011 at 7:05 am

buy a good radiator flush and follow directions. then replace the thermostat and put in new anti- freeze
It All Matters.~☺♥ says:

November 24, 2011 at 7:23 am

Make, model and year? Could be as simple as a bad diverter switch. But what kind of car? What model car? Come on man.
D W says:

November 24, 2011 at 7:49 am

Thermostat or water pump bad coolant is not circulating or your coolant is low