Question about 1998 Honda Accord

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98 Honda Accord EX -- air from the heater is luke warm when set at highest level. It's not the thermostat, the heater control valve or heater core. What else could it be?

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  • philschneide
    philschneide May 11, 2010

    How, exactly, do you know that it is not the thermostat?

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  • 318 Answers

The control knob is broken? It turns but the shaft does not?

Posted on Dec 09, 2009

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Bmw e46 316 2001,heater problem...heaters only blow out luke warm air.not sure whats causing the problem,could it be the thermostat,hedgehog resistor,or heater controll valve...advice please


Touch both heater hoses under hood when car is warmed up Kane, They should both be the same temp if your heater core is working good. The next thing would be to replace the thermostat.

Feb 03, 2014 | Cars & Trucks

1 Answer

No heat in my 94 Accord, replaced thermostat. Moved heater conrol gate valve by hand to every position, and still no heat. What is causing the lack of heat? Car is warmed up and idles well.


Hi,
it would appear that a heater door under the dash is not operating.However, check the route of the heater hose from the engine to the bulkhead which feeds the heater, then check the hose FROM the bulkhead back to the engine.The return line to the engine should be marginally cooler, If it is cold / cool then coolant is not flowing through the heater core. Locate the hose at the highest point of the engine, slacken it, and with the engine warm, bleed the coolant flow. Wear a long sleeved shirt / coveralls, gloves and safety glasses.

Everything ok? Then check for the operation of the heater door under the dash. Engine at idle, move the heater control and listen for the door closing. Also ensure that your air circulation lever is set for the car interior.

If you can't hear the door operating, you will have to do a visual insp under the dash.

You do not mention your skills level, so I would not presume to issue instructions for that task.

Good luck.

Jan 31, 2011 | 1995 Honda Accord

2 Answers

Heat is luke warm and coolant temp gauge not getting to operating tempature. installed a new thermostat with the valve up on the thermostat. removed the heater control valve to make sure it was functioning...


this is probibly a blockage in the radiator or water pump issue start by flushing the radiator,then check that water is flowing thru the radiator and water system.

Dec 21, 2010 | 2000 Honda Accord

2 Answers

Heater is blowing luke warm air. does not get any hotter


Quite a few idea's come to mind.
1) Thermostat is stuck open, causing the engine to run cool.
2) The vacuum valve that opens and closes the air "flap" is stuck open, allowing cool air in all the time.
3) The vacuum valve that opens and closes the line that feeds the heater core isn't opening all the way.

Jan 30, 2010 | 2004 Chevrolet Impala

1 Answer

The heat in my honda accord blow warm air.not hot


sounds like you have one of two problems first check at heater core lines going into heater core see if they are hot if only one is warm then it could be the thermostat but honda's have issues with hot water valve cable jamming up this valve is located behind engine near firewall on one of the heater core hoses.

Jan 03, 2010 | 1993 Honda Accord

2 Answers

1999 Honda Accord heater not blowing hot air


Sounds like a thermostat or cooling system issue. Change the fluid and the thermostat. It will do your engine good so it's money well spent.

Dec 31, 2009 | 1999 Honda Accord

2 Answers

Air, no heat '98 Astro. No leaks, engine


It sounds to me that you may have 2 problems. 1). Air Lock in the Heater Core. 2). Inactive Heat Damper in the Plenum.

But since you state that the Heater Hoses do not get warm that is indicative of an Air Lock in the Heater Core. This is a relatively simple fix. It is best performed COLD but requires a method of pressurizing the Cooling System. All reputable Auto Parts stores Sell and/or Rent Pumps that temporarily replace the Radiator Pressure Cap for Leak tests and curing Air Lock. The Collant Level must be filled FULL then pressurized and then loosening the Highest Heater Hose at the Firewall so that Air and a Small Amount of Coolant escapes. Once all the Air has escaped tighten the Heater Hose Clamp, remove the Pressure Pump, Restore the Collant Level to FULL, re-install the Pressure Cap and Start the Engine. As it Warms up you should be able to feel coolant running through the Heater Hoses and they should become warm.

Dec 07, 2009 | 1998 Chevrolet Astro

2 Answers

Cannot get heat even after changing thermostat in 1992 honda accord what do i check next


Check the heater control valve. It is usually behind the engine up next to the firewall. Have someone inside the car move the heater control to heat. A lever on the heater control valve should move when this is done.

This valve allows hot coolant to enter the heater core inside the car. If this hot coolant doesn't arrive, you have no heat.

Oct 14, 2009 | 1992 Honda Accord

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