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CRV 2000 heater not warming up

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My CRV 2000 heater is not warming up the car! Temperature guage showes normal, does not overheat, just regular temperature. Problem could be thermostat, heater core somewhat plugged, or may fan/ heater activator deflector? Same temp on both drivers and passenger vents. How to figure which it is? Just replace thermostat? Help would be appreciated!
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1999 CR-V LX 2WD
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When did you last check the cabin filter? It is a pain to get to in this car so it could be that it hasn't been changed and is clogged?

On mine, when the thermostat went bad it would take forever for the temp gauge to move and once it got warm would drop again if I drove over 25mph for any length of time. This would lead me towards something in your heating system and not the thermostat if your temp gauge is "normal".
 

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Discussion Starter · #3 ·
When did you last check the cabin filter? It is a pain to get to in this car so it could be that it hasn't been changed and is clogged?

On mine, when the thermostat went bad it would take forever for the temp gauge to move and once it got warm would drop again if I drove over 25mph for any length of time. This would lead me towards something in your heating system and not the thermostat if your temp gauge is "normal".
Good ideas! I was thinking thermostat, but maybe not! I’ve changed the canon filter, maybe # or 3 years ago.. maybe the heater core?
 

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2001 Crv SE
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427 Posts
I would first verify that the engine is actually warming up with a scan tool and/or a temp gun on the cylinder head. Should be at least 180 F. Cooling fans should come on around 220 F.


There is a shut off valve on heater hose that are prone to fail on hondas. Make sure it's not seized, and that it is open, opens. Download service manual if you haven't.

With the blower on and the engine warmed up you should be able to feel a difference in temperature between the inlet and outlet heater hose. If they are the same temperature I would suspect the in line valve. If it is good try flushing the heater core.

Also with the engine warm and the blower on, move the temperature from hot to cold, and back. You should feel some difference in temperature from vents. If there is no change at all in temperature i would make sure blend door actuator is working.

Probably valve in heater hose stuck closed.
 
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