Rep Power: 0

Hey there new here. I have a 2001 Honda civic lx. My car is over heating and my heater sometimes and sometimes doesn’t work. The fans sometimes turn on for a split second and turn off. The fans do activate when the ac is on. The fuses haven blown and I took it to a shop and they replaced the fan switch. It worked for a while till it started to over heat again and the heater started to do te same crap. Need help it’s m daily driver.
update
it stopped overheating and the heater worked for a few days. I didn’t do anything to fix it just fixed on its own. I’ve been driving it for a few days now now today I drove it out of town and back and it was fine. But tonight it started doing the same crap. It first started off with the heater air going cold. Then the temps rising. It only did this at a stop but when I drove the temp with go back to normal and the heater would start to work again.

 
Rep Power: 244

Probably head gasket. Does the coolant reservoir overflow?

 
Rep Power: 0

the e coolant doesn’t overflow. But I was reading some other forums that it can be a blown head gasket. I drove it this morning and ran fine and blew hot air while driving. Once I was coming to a stop and the rpm’s would be at 950-1000 the air would start to get cold. I noticed I only wants to over heat at idle

 
Rep Power: 0

the shop I took it to said the pump and radiator was fine.

 
Rep Power: 0

check the thermostat, i had a similar problem and that was the reason.

 
Rep Power: 224

When the head gasket fails combustion gases get into the coolant. That pushes coolant out and into the reservoir. Air doesn't transfer heat like coolant does so the engine will overheat and you lose heat in the cabin.

Check coolant levels in the radiator and reservoir.

 
Rep Power: 367

if so, the gasket might be fine.

 
Rep Power: 0

like i said, easily could be the thermostat.

 
Rep Power: 0

thermostat is only a month old

 
Rep Power: 0

I read a different thread with the same situation and it might be the head gasket. Air is being trapped in the coolin system. It’s a small leak so it’s hard to detect

 
Rep Power: 0

Hey I’ve made a post about my civic before for the same issue a month ago. Suddenly out of nowhere my car starts to heat up and the heater stops blowing warm air. It only doesn’t when I am at a stop when I’m driving it stops overheating and my heater starts to work again. The first time I took it to a shop they said it was the fan switch and fuses and relays were bad. Okay got it back a week later same crap. I did a combustion leak test no gasses in the coolant. After I did that the car went back to normal. A week later again with the same **** took it to the shop told me thermostat was stuck close. I got it back no longer over heating. Till another week goes by nd again over heating. I’m just annoyed and irritated at this point. I did a compression test and each 4 cylinders gave me a normal reading now I’m stuck on what to do next. Any advice helps.

 
Rep Power: 512

Did you bleed the ever living crap out of the coolant system (with the heater on full blast)? Also, any signs of coolant leakage anywhere?

 
Rep Power: 0

there is no leaks to be found. I checked the radiator and it has coolant. I have bled the coolant system.

 
Rep Power: 367

Waste of money.
do the test in the video in the first post here.

https://www.civicforums.com/forums/3...reference.html