invisible

I changed out the thermostat less than a month ago with an OEM one but it still overheated.

I just changed out the water pump and it doesn't over heat anymore, BUT when I have the temp **** all the way to cold(blue) it will rise up. THEN if I turn it all the way to hot(red) it will go right back down to normal temps and stay there.

Note, I did NOT have the air on EITHER time, it was on off.

So this tells me it's the thermostat?

Dee888

You may have air in your system.

invisible

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dee888 &raquo;</TD></TR><TR><TD CLASS="quote">You may have air in your system.</TD></TR></TABLE>

Hum I bleed it the best I could.

nub

did you put the thermostat in with the little jiggly pin up?

invisible

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nub &raquo;</TD></TR><TR><TD CLASS="quote">did you put the thermostat in with the little jiggly pin up?</TD></TR></TABLE>

Yeah. I also marked where the original one was before I pulled it out.

invisible

Tried bleeding it again, only saw one tiny tiny little bubble. Could that cause it to over heat?

Redline it.

check to see if your fan is working driving around for a bit...most likely its not workin so u might need to get a new fan switch.

DCSportEJ1Civic

thermostats usually stick open, maybe a clogged hose or radiator?

invisible

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Redline it. &raquo;</TD></TR><TR><TD CLASS="quote">check to see if your fan is working driving around for a bit...most likely its not workin so u might need to get a new fan switch.</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DCSportEJ1Civic &raquo;</TD></TR><TR><TD CLASS="quote">thermostats usually stick open, maybe a clogged hose or radiator?</TD></TR></TABLE>

But why would those make it over heat when the heater switch is turned to hot or cold make a difference? Could the thermostat be bad already? I tested it before putting it in but forgot to check what the water temp was, but it did open

DCSportEJ1Civic

as i said, thermostats usually stick open, not closed. which means the car will take forever to heat up. think about how the thermostat works and that will make sense. if something is clogged it will keep the coolant for going through the radiator which means it wont cool. as for the fan, the only time the fan is even needed it on a warm day when th car is standing still. even driving like 30mph will keep it cool enough to not need the fan as long as the coolant is moving through the system properly. how long has it been since the water pump was replaced?

invisible

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DCSportEJ1Civic &raquo;</TD></TR><TR><TD CLASS="quote">as i said, thermostats usually stick open, not closed. which means the car will take forever to heat up. think about how the thermostat works and that will make sense. if something is clogged it will keep the coolant for going through the radiator which means it wont cool. as for the fan, the only time the fan is even needed it on a warm day when th car is standing still. even driving like 30mph will keep it cool enough to not need the fan as long as the coolant is moving through the system properly. how long has it been since the water pump was replaced?</TD></TR></TABLE>

Swapped it out yesterday actually. Before it would over heat all the time and sometimes turning on the heat full blast it would bring it down some but not to normal temps.

It run perfect now cept I have to leave it the temp **** on hot.

victor.m

My '94 EJ1 actually just started overheating yesterday..I was thinking it's the fan since it's not coming on, but I'm changing the thermostat tomorrow and doing a complete flush to see if that solves it. I'm in Florida, so waiting for the car to "heat up" isn't much of an issue for me..good luck with whatever is going on with your car man, it sucks I only have any clue on where to start with this because some of the guys over at clubcivic helped me out..again, good luck, sucks to see our babies with fevers

DCSportEJ1Civic

if your turning the heat up and its fixing it ill almost guarantee that you have a clog

victor.m

turning the heat on helps it for me..it doesn't overheat AS much. How would I troubleshoot a clog?

DCSportEJ1Civic

let the car warm up and feel all the hoses. upper and lower radiator hoses, and the two hoses going to the firewall for the heater core. if theyres a cold spot somewhere thats where it is. as long as you know how the coolant flows through the system it should be pretty easy.

invisible

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DCSportEJ1Civic &raquo;</TD></TR><TR><TD CLASS="quote">let the car warm up and feel all the hoses. upper and lower radiator hoses, and the two hoses going to the firewall for the heater core. if theyres a cold spot somewhere thats where it is. as long as you know how the coolant flows through the system it should be pretty easy.</TD></TR></TABLE>

never thought of that before. ill try that t/m

DCSportEJ1Civic

no problem

invisible

is there anything else I can check or it could be? im about to be off work so i will check then.

invisible

checked all the hoses and everywhere was hot.

nub

strange problem. maybe something restricting airflow to or through the radiator,paper,plastic,leaves or bent fins on the radiator? if you have a/c then most debris will be caught by the a/c condensor but its still worth checking. if not im guessing one or some of the tubes in the radiator are clogged. turning your temp control to hot is allowing coolant to flow through the heater core, even though the fan is off its still a heat exchanger helping to cool the system down but im not sure how you would check for flow through the tubes. maybe stop by a radiator repair shop and see if they have any advice or can help.

thisisntjared

i am wondering if there is too much anti-freeze and not enough water...

invisible

i used prestone 50/50 mix. never gave me a problem on previous cars....

Dee888

Weird, i had the same prob the day i bought my eg. Went to go fix it the next day to only find out that the owner put water in it and it all froze. Removed the hoses and rad and let it thaw out and replaced it putting 50\50 in till it was full. I then let the car run with the rad cap off till norm temp and filled it till it was full and replaced the cap never had the prob again after that!.

Not saying that its a fix to your issue just throwing in how i got rid of mine.

I replaced my thermostat the other day and on the box it said make sure the little copper pin went towards the engine not up is this right or did i do this wrong? car takes forever to warm up even with the old thermostat .

invisible

Haha I'm in the south...I don't think anything freezes here.

cardr

How does the front of your radiator look? Are alot of the fins bent? Are there fins missing? Is the fan kicking on?

The reason it helps when you turn the hvac control to "red" is that you open the valve and allow coolant to circulate through the heater core ( basically a small radiator in your dash ) which helps cool down the coolant. So, this makes me think your radiator or fan is to blame.