bigdan

I have 1999 civic hx with 140,000 miles on it cheked the water level the other day and noticed it was about a quart low on water so i filled it than again a week and half later same thing but my overflow was full whats going on ? I dont see any leaks hoses,radiator no oil in the water no funny smells out of exaust !

98slowvicEX

you might have a bad thermostat not letting coolant circulate and it flows into the overflow? Any over heating issues? No coolant leaks?

bigdan

Well ya yesterday temp whent above the halfway mark that was because i hadnt checked the water level in the last week in a half so it was low overflow full to the top.Few years ago when i bought this car i went through the whole car and fixed what needed to be fixed and when i went to change thermastat there wasnt one there so i put one in and like i said i have never had an issue whith the car i do all services.My concern is why the water level dropped in the radiator and now overflow is full to the top.

bigdan

Someone please advise as to what is going on here.This weekend changed the thermostat put in new coolant drove it for two days later radiator low a quart of again .This time i didnt put any in the over flow so I would no if i have the same problem.What is in there is exactly what im am low in the radiator.Please Help need to fix this issue!

habib

Have you checked your engine oil lately? What color is it

bigdan

Yes I did engine oil is perfect no milky color nothing like that.Could this be a bad water pump ,radiator, radiator cap or possibly a head gasket going ?

sw07tc

looks like you kinda in same situation as I do now, but my over flow tank stay full and even leaks through the cap and loose coolants if i drive the car for more then 1:30, but i also has oils in my coolant. so now i'm doing major tune up on it myself. it has 200k on the motor, but head part still in silver looks not yellow like most do.

I did seafoam on it today, flushed my coolant, in process taking apart the head, so far has taken the IM and Injector out notice the seafoam didn't do much to the injector and IM.

I've asked many ASE Certified Tech and search on forum, but no helps, just guessing.

So I come up with major tune up on her. I'll be replacing Thermostats, Flush coolant, Radiator, Headgasket, clean out the Intake Manifold, Water Pump, Belts. Spark Plugs and Wires were replaced recently. will update with some DIY video along with my process...

good luck on yours, I think you might be thinking about a good tune up to it soon.

sw07tc

Two ASE Tech told me it's to try the thermostat, but it makes no sense because I had oil in my coolants, and another though i think because my car is an automatic so the transmition oil goes to the radiator too, so i hope it's thermostat and the radiator is my issue, but my car is at 200k so it's time for me to do a major tune up and hope it'll runs till 300k+