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Cold air from heater?

Tiny
ROBERTLEI
  • MEMBER
  • 1993 HONDA ACCORD
  • 4 CYL
  • 150,000 MILES
The heater in my honda has been blowing cold air. So I changed the thermostat, following my chilton manual instructions. I also made sure there was no obstructions in the hoses (and heater core) going to and from the heater core. My radiator fan kicks on as it should, so sensors should be good. Is there something Im missing with the blower fan, or is the water pump going out?
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Monday, February 14th, 2011 AT 6:12 AM

28 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
If it is a water pump problem, you should be having overheating issues. Did you check if the heater valve is operating correctly? Is the vacuum hose connections correct and are there any leakages? This guide can help us fix it.

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

Please run down this guide and report back.
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Tuesday, February 15th, 2011 AT 9:59 PM
Tiny
ROBERTLEI
  • MEMBER
  • 2 POSTS
Havent had any over heating problems. The heater valve is working correctly. Where would any vacuum hoses for this situation at? Ive tried all the buttons for the cables for the climate control. They're all working. The hose going to the heater core is hot, the return (?) Hose is cool to the touch. Ive made sure the heater core isn't clogged, (I pulled it out and connected a hose to blow through it) there are no leaks in the heater core. How would you recommend bleeding the coolant system of air? Thanks for your help and your input.
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Tuesday, February 15th, 2011 AT 11:38 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
When engine is cold, remove radiator cap and checkcoolant level. If it is full, there is no air in system. If it is low, top it up, start engine with radiator cap off. Run engine for 5 minutes and top up if necessary.

Close radiator cap and run engine until fans comes on at least 2 times. Allow engine to cool and recheck coolant level.

The return hose being cold indicates coolant is not flowing. Did you check the hose to water passage for clogging?

Pull out the hose going to the heater core and use a water hose to connect to the heater core. If water comes out of the hose from engine, it is not clogged.

If uou had used air to blow through the heater core, it would not be accurate. Use a water hose to test. If the volume coming out is fast, then it is good. You can try back flushing the heater core. Apply the water hose to the return pipe from heater after taking off both hoses.
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Wednesday, February 16th, 2011 AT 1:19 PM
Tiny
ROBERTLEI
  • MEMBER
  • 2 POSTS
I flushed out the heater core and the system started working again I think I had air stuck in it.
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Wednesday, February 16th, 2011 AT 1:21 PM
Tiny
MARKY1717
  • MEMBER
  • 1 POST
  • 1993 HONDA ACCORD
Heater problem
1993 Honda Accord Automatic

I have got a problem with the heater, at this present time the car only blows through cold air, I have changed the thermostat but this does not seem to have solved the problem. What else could this be, I was told the water pump may need flushing through but what pipe do you take off to do this, I hope your experts can help. Thanks mark
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Tuesday, December 1st, 2020 AT 11:14 AM (Merged)
Tiny
ZACKMAN
  • MECHANIC
  • 4,202 POSTS
Water pump does not need flushing, it doesn't retain any antifreeze, it probably needs replacing.

Heater core on the hand does need flushing from time to time. Locate the two heater hoses going through the firewall into the passenger compartment. Most of the time they are two different sizes, so you won't mess up installing. Undo both hoses, and run water through one and out through the other.
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Tuesday, December 1st, 2020 AT 11:14 AM (Merged)
Tiny
MZVANESSA
  • MEMBER
  • 2 POSTS
  • 1993 HONDA ACCORD
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 190,000 MILES
Can someone tell me why do I have to hit this black box under my glove capartment in order for my heater to come on? Also sometime it works if I hit that box and sometimes it still won't come on. Can someone pleae help me?
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Tuesday, December 1st, 2020 AT 11:15 AM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi mzvanessa,

The blower fan motor is on its way out due to carbon brushes wearing off. Soon the motor would not start working anymore no matter how hard you bang the blower motor housing. A replacement of the motor is necessary to resolve the problem.
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Tuesday, December 1st, 2020 AT 11:15 AM (Merged)
Tiny
MZVANESSA
  • MEMBER
  • 2 POSTS
Should I just tell soemone I need my blower fan moter replaced? Or is it called something else? Is it worth fixing becasue my car is so old? Does it cost alot or is it a reasonable price?
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Tuesday, December 1st, 2020 AT 11:15 AM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Yes, if you tell them what happens and needs to replace the blower fan motor, they would understand.

The book time for replacement of the motor is 2.3 hours if equipped with A/C.

If without A/C, the book time is 1.3 hours.

Our database does not have any listing of the part price so I am not able to let you know.

Labor time and parts prices varies region to region so it is best to get a quote from local shops. Ask around and you should be able to get an idea what it would cost.
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Tuesday, December 1st, 2020 AT 11:15 AM (Merged)
Tiny
MIWHITE
  • MEMBER
  • 2 POSTS
  • 1993 HONDA ACCORD
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 105,000 MILES
1993 Honda Accord heat will not get hot when driving. The heat works when idle, but gets cold while driving.
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Tuesday, December 1st, 2020 AT 11:15 AM (Merged)
Tiny
MIWHITE
  • MEMBER
  • 2 POSTS
How come the heat will work when in idol, but won't work when driving?
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Tuesday, December 1st, 2020 AT 11:15 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the thermostat and coolant level-start here
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Tuesday, December 1st, 2020 AT 11:15 AM (Merged)
Tiny
SAURI1987
  • MEMBER
  • 3 POSTS
  • 1993 HONDA ACCORD
Heater problem
1993 Honda Accord 4 cyl Automatic

the problem appera when it is raining. As it rains. I turned on the heat for the front screen and the back. When I turn wiper on. It leave vapor on the screen and I can't see anything at all. I dont know if that is the problem with the heater or the wiper. Please reply needed. Thanks in advance.
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Tuesday, December 1st, 2020 AT 11:15 AM (Merged)
Tiny
92 MAX
  • MEMBER
  • 36 POSTS
Hi Sauri

What is the outside temperature?

If very cold it may be freezing rain

otherwise it may be the air con is overwhelmed, especially if several passengers who may all be wet.

Turn off the a/c select outside air select windscreen and wind the window down a little

Regards
Don
New Zealand
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Tuesday, December 1st, 2020 AT 11:15 AM (Merged)
Tiny
JO_85
  • MEMBER
  • 1 POST
  • 1992 HONDA ACCORD
Heater problem
1992 Honda Accord 300000 miles

The heater absolutely does not work. It worked yesterday when I shut the car off. This morning, I warmed it up for 10 minutes before I drove it. The temp gauge (for the engine) shows my engine has warmed up but there is no heat coming out.
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Tuesday, December 1st, 2020 AT 11:15 AM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Does the fan blow air or is the air just cold? Might want to look under the hood on the heater hoses, there should be a valve that lets hot air in the car, might have a cable problem or just be broken
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Tuesday, December 1st, 2020 AT 11:15 AM (Merged)
Tiny
LATOYNA
  • MEMBER
  • 1 POST
  • 1992 HONDA ACCORD
  • 4 CYL
  • 2WD
  • MANUAL
  • 9,000 MILES
Heater blows cold air
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Tuesday, December 1st, 2020 AT 11:15 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Find the thermostat-replace it and check the heater hoses and core if its clogged-up. Coolant level filled.

Make sure sure the water pump is pumping that coolant through out the engine. Also could be a clogged radiator.
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Tuesday, December 1st, 2020 AT 11:15 AM (Merged)
Tiny
LOPEZJOSUE
  • MEMBER
  • 2 POSTS
  • 1992 HONDA ACCORD
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 124,000 MILES
Hello I have my honda accord 1992 ex the heater yes stop work I dont know isf is the blower swich or I dont know
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Tuesday, December 1st, 2020 AT 11:15 AM (Merged)

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