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In normal circumstances the heater wouldn't begin blowing warm air until the vehicle has travelled 5 miles - call it 5 minutes. That's because the thermostat only begins to open at around that mileage/time and allows coolant to circulate around the engine. Before that - there just isn't any warm coolant in the heater matrix.
After 10 miles/10 minutes of normal driving the engine will be at its correct operating temperature and the coolant will be hotter - as will the circulating coolant in the heater matrix. That's when the heater blows the hottest air.
If you're sure that the heater has lost efficiency it may be due to air being trapped in the heater matrix/coolant system, or a blockage caused by limescale/engine corrosion within the heater matrix itself.
To remove any trapped air, set the heater to maximum, remove the radiator cap/coolant bottle cap and let the engine tick over for 10 minutes.
If the heater matrix is blocked/partially blocked, drain the coolant system, refill with plain water, set the heater control to open .. and let the engine tick over for 10 minutes. Drain it again.
Refill again with plain water and add a can of 'radiator flush'. Follow the instructions on the can of 'radiator flush'.
Drain again and refill with coolant/water.
If the heater is still inefficient then the only option is to replace it - and that's not an easy job.
check the heater hoses going from motor thru firewall to heater core / if they get warmer when motor is at 2000 rpms or higher then most likely problem is heater core stopped up / if the hoses dont change then thermostat could be stuck open ! good luck
If the heater tap,that supplies water to the heater core,is not adjusted properly,it may do that.What does the engine temp switch indicate?If its showing normal temp and the heater still blows cool air,look at the tap.If the engine temp shows its still cool,the engine may not have a thermostat in it.Thirdly,the heater core may have a partial water blockage and needs to be flushed out.(quite common).Hope this helps
1st thing I would do is have your thermostat checked at a rebutable rad shop also somtimes the rad cores get blocked and will not circulate the heat properly either problem can be rectified at the rad shop...good luck
Maybe the heater core is blocked.....try using the water hose to force water thru it. You will need to take BOTH lines loose from the heater core..water should come out fast....Be careful and go slow,don't break the necks of the core !!!
Yes. Flushing the radiator would be a great first step. Check that your heater core feed and return hoses are not leaking or clogged. If it is still acting up, you may have a clogged or leaking heater core. Good Luck.
You either have a thermostat that is stuck open or the heater core is plugged. Get the vehicle warm and feel both of the hoses going to the firewall/heater core. Both of the hoses should be hot to the touch. If one is hot and the other considerably cooler, the heater core is plugged. If both are relitively cool, the thermostat is stuck open.
unless you got visable signs of leakage its not heater core, but it could be pluged with sediment. take off both heater hoses and flush it both ways until it runs clear. you can also mix a little baking soda and water and pour in core and let set for a while and then flush.