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my car is overheating. first thing i see the temp gauge is rising like crazy, looking under the hood, i decided to touch radiator hoses. the upper one its blazing hot but the one with the thermostat is cold. i replaced the thermostat recently and radiator not long time ago. what else could causing that issue?. thanks

 
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Did you put the thermostat in backwards? Thermostat mught be junk

 
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thanks for replying. i just replaced it for a new one. the other one had the head with a piece broken. but the weird thing was some gunk laying in the hose, looked like a sealer or gasket sealant and i think i put it right because it wont fit the other way though. it was all the problem for now. because now both hoses has same temps.

 
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aftermarket thermostat is known to not work on hondas. Is it OEM?

 
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mmm why?, dont take me down please
was not O.E.M. nor the new one.

 
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Ok got some updates here. Car is not overheating anymore but now has a rough idle. Did I miss to connect anything or have any leak?. It only happen when idle or at a stop light. Also after warming up the engine I feel some vibration in it (engine rocking) oh and the check engine light came on too.

 
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Scan it see what the code is.

 
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just to take this out of the way - is your overflow coolant tank full?

also, read thru this thread.
https://www.civicforums.com/forums/3...reference.html

 
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Nope, actually looks like some is going back.

 
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i came from Oreillys to do code scanning. i got 4 codes:
P0505 (idle air control system)
P0303 (misfire cylinder #3)
P0300 (random misfire)
P0302 (misfire cylinder #2)
he only suggested me to replace the valve cover gasket. i don`t think is the only thing needed. i lost some power from the engine that`s why i suspect of something else.

 
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While you know I'm a full proponent for Honda OEM, I will say, I've had good luck with AutoZone t-stats. Sensors and other electrical stuff, def stick to OEM/Denso

@betdriver01 Bleed the ever living crap out of your coolant system. If you need a how-to, here's the quick and dirty:

1. Park with the front end elevated a little (ramps, driveway, jack stands, whatever you have at your disposal. Just need to make absolutely sure the radiator cap is the highest point of the coolant system
2. Start the car with the rad cap off, heater full blast, and put a radiator funnel where the cap was.
3. Run that bish for forever, getting to as close to normal op temp as possible.
4. Keep an eye on coolant levels, topping off as needed.
5. If the bubbles stop, run it for like 5-10 more minutes. I personally reset that clock every time I saw bubbles come back.
6. Not a good sign if the bubbles don't stop.

The gunk that you ran into isn't giving me a warm fuzzy, but we can hope.
Also, bc you have misfires on 2/3, pull those plugs to see what they look like

 
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much appreciated for the info. i will do it for sure. Merry Christmas bro.