My 86' Honda Accord was overheating bad, like to the max a couple weeks ago. I bought a new thermostat and replaced it and I had no issues. I also flushed my radiator. (not the first time) The car has been completely normal. A couple days ago I noticed only when i idle it overheats. Once I start driving again, it goes down to normal, if I sit at a stop light too long it overhearts passed the middle line. I have no clue whats doing this.
Sounds like the radiator fan is not coming on. Check if the fan is running when your engine starts overheating.
Hope this helps.
Replace the radiator.
SOURCE: 1991 Honda del Sol Overheating and funny idle
The idle problem kinda sounds like the IAC (Idle Air Control) valve on the intake manifold. Another idea is maybe coolant temp. sensor. And if it's leakings coolant still after replacing all those parts then i would say maybe the water pump is leaking since i believe on those motors its by the timing belt which is behind the plastic cover on the motor so maybe that's why you're not seeing fluid so much because it's in there. Hope some of this helpes, good luck.
SOURCE: 1998 HONDA ACCORD EX V-6
Sounds like your automatic idle control valve needs to be cleaned. Common irratic idle issue. Just remove, shoot carb cleaner onto ports until comes out clean. should be able to move valve inside easily.
SOURCE: 1994 Honda Accord Overheating unless Heater is On.
Make sure your fan is working properly. When you turn on the heater you are forcing the fan to cool the radiator. It may not be turning on automatically when it is supposed to. Let us know if this helps..
SOURCE: 1994 Honda Civic LX\overheating within 2 mile drive
Remove and raise upper hose at thermostat end and remove lower rad hose.
Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily.
Honda rads are cheap.....any restriction....replace rad.
Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose.
Flush good.
Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.
Stop leak can plug everything.
Also.......not likely causing over heating....but ....at your mileage,if you do not know if the timing belt has been changed.....CHANGE IT NOW!
Water pump is optional at this mileage.
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