Overheating....WHY?

**dBlockinc** · 05-02-2006, 08:56 PM

i have a 93 civic 1.5L a/t
in the past 6 months i have replaced....
radiator, thermostat(twice), water pump, temp sensor and switch.
someone out there has the answer
HELP PLEASE

**nDrew** · 05-02-2006, 08:58 PM

Did you open your oil cap to see if there was a creamy looking liquid? If you are running out of coolant, fogging out your exhaust, your compression sucks, or if you have Spooge looking oil then you probably have a blown head gasket.

**dBlockinc** · 05-02-2006, 09:00 PM

no creamy oil

**3kgtdrvr** · 05-03-2006, 07:20 PM

do u lose any coolant? was anything been changed and then it started to overheat?

**dBlockinc** · 05-03-2006, 07:29 PM

yes the coolant boils out
i was in a wreck busted the radiator(got a new one)
then 3 months later the overheating started
thermostat changed good for 3 -4 weeks
water pump changed good for 5 weeks
thermostat and temp sensor and switch changed on sunday
STILL OVERHEATING!!

**Spyder** · 05-03-2006, 07:29 PM

Do your fan/fans work?
Is one of your radiator hoses crushed?
What is your coolant level at?
Where is your timing set? is it advanced?
Have you done a compression and leak down test?
How old is your 02 sensor?
How old is you cat?
When did you last replace the tranny fluid?
No creamy oil? ok how about your coolant, anything funky looking there?
Does it over heat when idleing? Driving normally? Driving at highspeeds? Driving aggressively?
Is the theromstate in the right way or backwards?

Awnser that and we will see what is going on..

**dBlockinc** · 05-03-2006, 07:41 PM

yes
no
full before i start it
normal, new timing belt when i had the water pump replaced
no
unsure
unsure
i haven't car has 88000 miles
no funky oil or coolant
yes, yes, yes, not driving aggressive now
its in right

**CSquared** · 05-03-2006, 07:57 PM

What kind of coolant/water mix are you running?

Did you by any chance use a refurb water pump?

Get a compression, leakdown, or block test done... That should be the first step on your priority list.

I'm calling headgasket.

**Spyder** · 05-03-2006, 08:00 PM

Well,shit... lol

First thing I would do is spend a few bucks on a decent quality temperature gauge and make sure the factory one isn't just screwed up.. it happens. Next I would do a compression and leak down test to make sure all the exhaust is making it out of the cylinders and you don't have a stuck exhaust valve. If everything checks out there you know it isn't a valve and you know it isnt bad rings or a bad head gasket. You mentioned that it is "full before you start it" which likely means it isn't full after it runs hot... which means it is getting out somewhere, if you dont see any leaking on the motor at all, no vapor in the exhaust or anything else it is likely something simple.. here is what it could be.. i know it sounds stupid but.. replace the radiator cap, a bad one wont hold pressure and will do exaclty what you are having problems with. also check to make sure the place the radiator cap sits inside the radiator fill neck is flat.. try it with something like a really large washer and make sure it doesnt rock back and forth... it could be a defective radiator or one that got to hot and warped.

In addition to everything else check the tranny fluid and make sure it isn't old or dirty or discolored, it can cause a motor to run hot for a few reasons.

A bad 02 sensor can cause the motor to run lean which can cause the motor to run hot, not normally at idle so i doubt that is it.

If your cat is getting realllllllly hot but the exhaust just behind it is relatively cool that means it is stopped up, which means it needs to be replaced (or gutted) so the hot exhaust can get out.

I know you think the thermostate is in the right way but if it isnt it will sometimes not open fully or properly and will cause the motor to over heat.

Do both of the radiator hoses get hot or just one side before it over heats? if just one side this is an indicator of a possible bad water pump, yes... unfortunatly, again.

**CSquared** · 05-03-2006, 08:08 PM

Originally Posted by Spyder

You mentioned that it is "full before you start it" which likely means it isn't full after it runs hot... which means it is getting out somewhere

replace the radiator cap, a bad one wont hold pressure and will do exaclty what you are having problems with. also check to make sure the place the radiator cap sits inside the radiator fill neck is flat..

I know you think the thermostate is in the right way but if it isnt it will sometimes not open fully or properly and will cause the motor to over heat.

If the coolant in the resuviour is boiling i wouldnt be suprised if it is boiling over...

With the thermostat... If he didn't get the proper thermostat for his oem temp range that could be causing problems as well.

get the cooling system pressure tested. Could be sucking in air although you'd be leaking fluid as well.

**dBlockinc** · 05-03-2006, 08:13 PM

the thermostat flutter valve needs to go which way?
the over flow resivoir has a crack in the cap where the hose comes in it is boiling out there
that is my fluid loss

**dBlockinc** · 05-03-2006, 08:14 PM

the oem temp i think is 170
i got a thermo for that temp
thats what they said at the parts store at least

**3kgtdrvr** · 05-04-2006, 05:56 PM

Originally Posted by dBlockinc

the thermostat flutter valve needs to go which way?
the over flow resivoir has a crack in the cap where the hose comes in it is boiling out there
that is my fluid loss

by thermostat flutter valve u mean the dangly thingy on the thermostat right? (my super scientific talk lol) if its that then it has to go straight up

**91199si** · 05-04-2006, 06:01 PM

run the car and see if the fan is coming on

**Hondasi** · 05-05-2006, 07:40 PM

get a new swap

**BLk92DA** · 05-06-2006, 05:58 AM

buy my car

**99SI** · 05-06-2006, 11:43 AM

There is a good possibility that there is an air pocket in the cooling system which doesn't allow the full amount of cooling and when you have an air pocket it superheats and the fluid around gets super hot as well. run it, refill it, idle it refill it, keep doing that to make sure you have the capacity. If that's not it reading the rest of the responses on here I would say you have a headgasket seeping. Just because the oil isn't creamy or steam isn't coming out the exhaust doesn't mean it's not seeping. If it is a small leak directly at one of the cylinders it will cause a hot spot on that cylinder. The same thing happened with Spoolins car when he couldn't figure out why the temp would run up high. Good luck and let us know if you get a resolution.

**CSquared** · 05-06-2006, 02:50 PM

Originally Posted by 99SI

There is a good possibility that there is an air pocket in the cooling system which doesn't allow the full amount of cooling and when you have an air pocket it superheats and the fluid around gets super hot as well. run it, refill it, idle it refill it, keep doing that to make sure you have the capacity. If that's not it reading the rest of the responses on here I would say you have a headgasket seeping. Just because the oil isn't creamy or steam isn't coming out the exhaust doesn't mean it's not seeping. If it is a small leak directly at one of the cylinders it will cause a hot spot on that cylinder. The same thing happened with Spoolins car when he couldn't figure out why the temp would run up high. Good luck and let us know if you get a resolution.

That's why we've been telling this f'n guy to get the car tested. I considered it being an air pocket too but i didnt think that would cause such "violent" overheating during idle. Regardless, if thats the case(headgasket), the bitch will blow up eventually.

I'd still like to know whether or not it was a reman. water pump.

**dBlockinc** · 05-07-2006, 09:37 PM

water pump was brand new.
it is at the shop now to have leakdown test tomorrow
i will let y'all know what we find tomorrow
thanks for all the advice from everybody

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