Heater does not work

Tiny
TOMMYBOYINK
  • MEMBER
  • 2004 HONDA CRV
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 50,000 MILES
Heater does not work, looking for advice on fix and repairing it?


Thanks
Tommy W
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Monday, March 23rd, 2009 AT 12:29 PM

22 Replies

Tiny
F4I_GUY
  • MECHANIC
  • 3,302 POSTS
Well check the fuses first.

If the fuses are fine, check if the blower motor is receiving a power and ground signal when the blower fan is turned on.

Check out this guide

https://www.2carpros.com/articles/car-heater-not-working

Please run down this guide and report back.
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Wednesday, March 25th, 2009 AT 5:18 PM
Tiny
DONLYTTON
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  • 0 POST
Thank you for this post the guide showed me the thermostat was bad got anew one for $46.00 all fixed!
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Tuesday, September 24th, 2019 AT 7:38 PM
Tiny
JOTHMER
  • MEMBER
  • 5 POSTS
  • 2003 HONDA CRV
  • AWD
  • AUTOMATIC
  • 120,000 MILES
My Honda CRV is not blowing out hot air. It's been flushed and changed the heater core but still no heat.
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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Was the thermostat checked? Was the system bled of air? This guide can help.

https://www.2carpros.com/articles/car-heater-not-working

Please run down this guide and report back.
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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)
Tiny
JOTHMER
  • MEMBER
  • 5 POSTS
Yes on both. Got a little heat on low setting after the heater core was replaced but not anymore.
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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Are both hoses to and from the heater core hot?
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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)
Tiny
JOTHMER
  • MEMBER
  • 5 POSTS
No one is hot and the other cold
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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
This indicates coolant is not flowing and it could either be due to clogging of the heater core or the hoses are not installed correctly.

It could also be due to the thermostat sticking in the open position or a weak water pump.

When flushing the heater core, were the flushing water coming out strongly?
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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)
Tiny
SK8PAT777
  • MEMBER
  • 1 POST
  • 2002 HONDA CRV
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 81,000 MILES
Hello,
I have an 02 Honda CR-V with about 81k miles.
For 2 months now, my heater and AC have not been working. All fuses seem fine, never had a problem before. Air does not even blow out.

When I have it in outside air mode the air comes, of course, and at the correct temp I set it to, if I am making sense.

Need help before I buy parts and replace, any diagrams, info is MUCH appreciated!

Thank you!
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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)
Tiny
DAVE H
  • MECHANIC
  • 13,383 POSTS
How to Retrieve a Diagnostic Trouble Codes
The Heater Control Panel has a self-diagnosis function. To run the self-diagnosis function, do the following:
Turn the ignition switch OFF.
Turn the fan switch OFF, the temperature control dial on Max Cool and the mode control dial on Vent.
Turn the ignition switch ON (II), then press and hold the recirculation control switch. Within 10 seconds while holding the switch down, press the rear window defogger switch five times. The recirculation indicator blinks two times, then the self-diagnosis will begin. If there is any problem in the system after self-diagnosis is finished, the recirculation indicator will blink the Diagnostic Trouble Code (DTC) 7 through 13. When problems in the evaporator temperature sensor circuit are detected (codes 14 and 15), the A/C indicator will blink the DTC. If no DTC's are found, the indicator will not blink.
Fig. 7: Retrieving DTC
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig. 8: Example Of DTC Indication Pattern (DTC 7)


https://www.2carpros.com/forum/automotive_pictures/266999_dtc_3.jpg



https://www.2carpros.com/forum/automotive_pictures/266999_dtc2_3.jpg


Canceling the Self-diagnosis Function
Turn the ignition switch OFF to cancel the self-diagnosis function. After completing repair work, run the self-diagnosis function again to make sure that there are no other malfunctions.
Max Cool Position Function
When the mode control dial is in the MAX A/C position, the heater control panel will automatically select the Recirculation mode and turn the A/C on. The recirculation switch and A/C switch are disabled and cannot be turned off in this mode. If the control panel fails to function as described, replace it.


https://www.2carpros.com/forum/automotive_pictures/266999_dtc3_2.jpg



https://www.2carpros.com/forum/automotive_pictures/266999_dtc4_1.jpg

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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)
Tiny
JOTHMER
  • MEMBER
  • 5 POSTS
Yes the water had good flow
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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
If the water had good flow, then it should not be a clogged heater core. Check the hoses for clogging.
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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)
Tiny
JOTHMER
  • MEMBER
  • 5 POSTS
Already been checked and replaced heater core
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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Recheck the thermostat, ensure it is not sticking in open position. Remove radiator cap and while running note if the coolant are circulating when engine is cold.
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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)
Tiny
THRITYSHARK
  • MEMBER
  • 1 POST
  • 2002 HONDA CRV
Air Conditioning problem
2002 Honda CRV 6 cyl All Wheel Drive Automatic

I started my Honda yesterday and have absolutely no fan, for the heater or the air conditioner. We had the entire A/C unit replaced last summer. I checked the fuses and cannot find one that seems to be blown. Is this a belt issue?
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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Hi thrityshark,

If the blower fan is not working, it most probably is caused by a failed motor.

Give the housing under the dash some gentle banging with your fist to check if the motor starts running, if yes, the motor is due to be replaced.
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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)
Tiny
MICHAS
  • MEMBER
  • 1 POST
  • 2002 HONDA CRV
Air Conditioning problem
2002 Honda CRV 4 cyl Four Wheel Drive Automatic 135k miles

I have had icecold air until yesterday when at a stop light the aire was luke warm. As I accelerated the air cooled off and was ice cold again until I stopped. Could this be a belt problem or is it a serious AC problem?
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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)
Tiny
F4I_GUY
  • MECHANIC
  • 3,302 POSTS
When you are stopped at a light put the vehicle into neutral and revv it up, does the incoming air get colder?

And yes this is an a/c problem. I've seen loose belts and low refrigerant cause this.
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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)
Tiny
CMSIDUR
  • MEMBER
  • 1 POST
  • 1998 HONDA CRV
  • 4 CYL
  • 2WD
  • MANUAL
  • 200,000 MILES
My car's heat is not hot but warm. I thought it just needed to warm up like most cars but as the days get colder so does the car. It used to take about five minutes to get hot but now its just warm. Can anybody help me with this problem?
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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Hi there,

Thank you for the donation,

Check that the heater hoses coming from the engine into the cabin are both hot to touch with the heater on and engine at normal operation temp. If not, you have no flow through the heater core, this may be due to a blocked core or a faulty heater tap, check this out first.

Mark (mhpautos)
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Tuesday, September 24th, 2019 AT 7:39 PM (Merged)

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