OK, this is driving me up a wall....I replaced my 10 year old t-stat because it was geting stuck open..So I bought one from honda, and the car is still over cooling, tried an auto zone one to with no luck as well....If you let the car idle for 5-10 min., it heats up to normal operating temp, the fan kicks on, everything looks good, but as soon as I drive the car down the road, the temp gauge starts to go almost to the cold mark...So I pull over and the car is high idling like its supposed to when its cold, I then let it sit for a few min. and the idle goes back to normal as well as the temp gauge...I have tried switching temp sensors with known good ones as well as 2 new t-stats with the same problem.....The car functions perfectly only at idle when the temp gauge is where its supposed to be...PLEASE HELP....Right now I am thinking of trying a third t-stat because I have know f-n clue whats goin on..............THANKS!!!

 

was the thermostat installed correctly the dot up and was the mixture of the coolant 50/50?

 

Coolant was a 50/50 mix., and the jiggle pin in the stat was installed up...The gasket is notched for the pin as well as being notched where it fits in the housing so theres really no way to screw up the install, and yes the spring side is inward, so its not installed backwards...

 

Coolant was a 50/50 mix., and the jiggle pin in the stat was installed up...The gasket is notched for the pin as well as being notched where it fits in the housing so theres really no way to screw up the install, and yes the spring side is inward, so its not installed backwards...

 

sounds very wierd , interesting.

 

is your fan staying on after it comes on , or does it come off like normal?

 

Fan kicks off after 30 seconds or so like it would normal.....This is a strange problem...I am not really sure either, but its pissing me off because I keep thinking its gotta be the t-stat...What the hell else could it be???I allready bought two new ones though...One oem and one from auto zone and both are doing the same thing....What are the chances of two bad t-stats..ya know????

 

possible but unlikely...

i mean , cooling systems are so simple its not even funny.....it has to be in your thermostat.......

 

maybe the housing or somthing . somthings allowing coolant to run all the way through constantly.

 

Maybe the temperature sensor is broken?? Does it drive any differently?

 

No, it does not drive any different, and I switched the ecu temp sensor with my friends (the sensor under the distibutor), and not the single wire one, I know thats for the gauge, and had no luck....I agree, I would say it could not be anything other than a t-stat, but 2 bad ones in a row, I would definately have to say thats unlikely, but I am also running out of options here....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hella_JDM &raquo;</TD></TR><TR><TD CLASS="quote">maybe the housing or somthing . somthings allowing coolant to run all the way through constantly.</TD></TR></TABLE>

I would think if the thermostat was closed it would not matter about the housing since the water cant get past a closed t-stat...thanks though..

 

Sounds like an air bubble in the coolant system. Have you bled the system again?

 

dont air bubbles usually cause it to overheat?? My friend installed a fluidine recently in his car and we noticed that when we are on the freeway and noone is in front of us for about 5 minutes the temp starts to go down slowly and eventually it will be just a little bit above the bottom line on the gauge. Thats some crazy cooling

 

Yes, I have bled the cooling system, but as allready mentioned air pockets in the cooling system usually cause over heating.....Thanks though...

 

Thats a good motor you have then. And it does make a difference when your motor is cooler LS motors do that. I love LS motors for that reason. But somehow my R motor does it too *shrugS*

 

you dont want your motor that cool.....you get increased wear . plus less horsepower , motors have an operating temp for a reason.....

 

Place a cardboard on front of the radiator and drive it to if it does the same thing. if so, I would recommend inspecting the gauge and temp sensor possible losing a ground singal while driving. if it does not do the same thing, make sure that your water pump is correct for your car and check your radiator it may be a wrong that causing it to over cool.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 500hpsi &raquo;</TD></TR><TR><TD CLASS="quote">Place a cardboard on front of the radiator and drive it to if it does the same thing. if so, I would recommend inspecting the gauge and temp sensor possible losing a ground singal while driving. if it does not do the same thing, make sure that your water pump is correct for your car and check your radiator it may be a wrong that causing it to over cool. </TD></TR></TABLE>

I actually swapped radiators too as a last resort with no luck....I know the gauge is reading accurate because when it is reading more to the cold side the idle goes up accordingly (like the car does when u first start it in the a.m.), the only thing I am not 100% sure of at this point is the actual temp sensor that controls the radiator fan...At idle it works like its suppose to, however I dont know about when I am driving down the road..I am going to unplug the temp sensor for the fan, and drive it around while I monitor the temp...I am at the end of my rope with this problem...I might go to peps and buy a t-stat from them as another last resort...

 

well you can either replace the sensor since they are fairly cheap or test reading while your driving. However, have some else drive while you monitor the reading.
You will be looking for an abnormal voltage drop.

 

cool ,thanks for the advice..

 

problem fixed....Got a new thermostat from pep boys, as well as fitv being backed off some...No more overcooling or idle surge..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted-delslow &raquo;</TD></TR><TR><TD CLASS="quote">problem fixed....Got a new thermostat from pep boys, as well as fitv being backed off some...No more overcooling or idle surge.. </TD></TR></TABLE>

Sorry I was under my boyz screen name.....Anyway problem fixed!!

 

fitv?

 

Same problem with my car, I am just too lazy to replace the thermosatat.