Question about 1995 Honda Accord

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94 Accord, heater blows cold air, car revs at idle once warm

Got a 94 honda accord, had an over heating problem, replaced thermostat which was stuck closed and had a lot of junk all around it. Flushed coolant and filled back up. Fixed the overheating problem but now i have no heat when i turn it on. The knob is not broken and i can hear what sounds like the a valve or something opening or shutting when i turn the heater all the way to the max. I feel like maybe the heater core is bocked up with the junk that was in the thermostat housing, but idk where the core is or how to clean it out. Also the car revs up and down (between 800 to 1500 rpm) once the car is warm and you put it in park. The problems might be related but idk. Please help?

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  • scottyhunerw Dec 30, 2008

    thanks for the reply. how did you flush the heater core??

  • scottyhunerw Dec 30, 2008

    Thanks for the replies, how did you flush the heater core jmakkinga?

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I have a 94 honda accord and I had a problem with my heater core...its in the dashboard next to the ac unit

Posted on Feb 10, 2011

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Your idle problem could be a vacuum leak on your intake manifold. Without looking at it, I think you can pull the idle control valve off and put a piece of cardboard as a makeshift gasket with no port in it so it seals off the idle control valve altogether and start it and see if it surges. You may have to hold the throttle slightly so if it won't idle.That will eliminate your idle control valve. I think there is also a warm up solenoid you can check that way too.
Once you get it back together, to check for vacuum leaks, with the eng idling, spray carburetor cleaner around the intake gasket flange. When you hit the leak, the idle should stabilize for a couple seconds.

Hondas have a circuit, so when the vacuum leaks, the idle surges until it hits around 1500 and then the ignition is cut off and the idle drops and then it happens all over again. That is the surge cycle you experience most likely. I have been thru the exact same symptoms.
(Bear in mind this is all from memory, might not be exact)

Posted on Dec 31, 2008

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My girlfriends Acura Integra had the same issue - it was 2 things, it was air in the heater core and the heater core was totally plugged with gunk. We did a heater core flush and bled the coolant system and it was good to go after that.

Posted on Dec 30, 2008

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Although I think your right about it being the heater core, I don't know where it is and I can only offer help with your idle problem. It is your idle control valve, it is a very common problem in Honda's.

Posted on Dec 29, 2008

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