Question about 1998 Acura TL

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Heater Slow to Warm Up

Have noticed the heater takes many minutes to warm up. Is this a sign of a heater core going out, it has 148,000 miles.

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  • stmike432 Oct 30, 2008

    help appreciated

  • stmike432 Nov 03, 2008

    Nope, I replaced thermostat, still VERY SLOW to warm up.



    Maybe heater core is bad????

    Aren't these a pain to replace, because of where they are located?

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Probably the thermastat stuck open and not allowing water to heat up before going through the radiator.

Posted on Oct 30, 2008

  • samson-1
    samson-1 Nov 03, 2008

    Is the engine slow to warm or the heater? It could be the heater core if only the heater is slow. You can flush out the heater core by un-hooking the heater hoses under the hood and using a garden hose to flush the core.

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1 Answer

Heaters slow at warming up


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.

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Have your thermostat checked, sound like it is not working when cold.

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Even though I let my car run for 20 minutes to warm it up, when I get in the heater is still blowing out cool air. When I start driving, it blows out warm air. But when I stop for a stop sign or light,...


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

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Is the engine temp warm, if not bad thermostat. If the temp is warm you either have a clogged heater core that needs flushed, or your warm/cold air door motor under the dash is not working.


Please take a moment to rate my answer............Thanks

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I just bought this car with only 36k miles and the heat takes 15 minutes to blow warm air. Does this signify a big problem?


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

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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

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ICANT GET HEAT IN MY 1992 TOYOTA PASEO. I HAVE CHANGED THE WATER PUMP, HEATER CORE, THEROSTAT, RADIATOR, AND THE HEAT STILL BLOWS OUT JUST A LITTLE WARM.


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 !!!

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Inside vehicle takes long time to warm up.


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.

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1 Answer

My heater won't warm up has antfreeze 150,000 miles


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.

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96 Jeep Country-Heater blowing warm; NOT hot


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.

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