Question about 1990 Honda Accord

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1990 Accord Too Much Heat!!

Hi gang, I've recently adopted a 90 Accord. Did all the engine work, runs great, but the heater is always supplying heat. Fan can be shut off, but it appears there's no control through the temperature control dial-thing. Car WAS equipped with A/C but hasn't been charged for years. Temperature control seems to be the problem because I can't feel much resistance when I turn the control from cold to hot--does anyone have an idea on how to fix? Thanks in advance!

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  • 3 more comments 
  • petewyman Aug 06, 2008

    Thanks, Pierre, I'll check it out and report back!

  • petewyman Aug 11, 2008

    Thanks--you were right on!!!!!

  • mst6901 Nov 13, 2008

    I have a 1990 Honda Accord EX. I am having a problem with the heater temperatur control. When turning from hot to cool, the knob broke. I attempted to use pliers to turn the switch and it will not budge. Am I facing a cable issue or a control valve (near the firewall, under the hood) issue?

  • Anonymous Dec 09, 2008

    where is the thermostat on my 1990 accord lx 4dr?

  • Anonymous Apr 16, 2009

    Cant regulate heat anymore: is heating constantly!

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  • Honda Master
  • 2,039 Answers

On passager side near the console under dash our gonna see a black plastic with a plastic snap remove that un der that the hot cold vent that cable is probably bend remove that cable and manualy move the trap heat will stop comming in or you can have a jam water valve under hood near firewall passager side hope it a fixya pierre

Posted on Jul 31, 2008

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Posted on Jan 02, 2017

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Possible causes of overheating are:
  • stuck thermostat. In my country, some mechanics even remove entirely the thermostat (not applicable on cold weather);
  • faulty water pump;
  • too soft radiator hoses (upper and lower);
  • faulty/slow radiator fan. Again, in my country, some mechanics hard wire the radiator fan to be always on when the engine is running. In some cases, it could be the fan clutch.
This is of course assuming that nothing is internally wrong with the engine, the coolant level is as required and that there are no leaks, air bubbles and the belt driving the water pump is mechanically sound. In most vehicles, the radiator fan will not work if the A/C or heater is not working.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

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