clem kevin

So in recent months my MPG has been going down, the upper hose is hot and the lower hose is cold on the radiator, so i began to assume the thermostat was bad.

Before i bought the slim fans and installed them, i never checked to see if my radiator fan even turned on, but since i have installed the new slim fans, i noticed that they only turn on when i turn the A/C on.

I ran the car for 10 minutes just now after installing a new thermostat, and the upper hose is hot and the lower hose is cold, i have read elsewhere that they are supposed to be neutral, right?

I just want to know why my fan wont turn on, and im thinking about just hardwiring my A/C fan to a switch so i dont even have to think about it.

EnjoyTheRideDC2

iTrader: (1)

Have you checked to see if your fan switch is plugged in or working? Its the brown colored sensor, right on the t-stat cover plate. That sensor will switch the radiator fan on as soon as the engine reaches a certain temperature.

When your car reaches operating temp, both upper and lower hoses are supposed to be warm/hot. If the lower one is cold, the t-stat is usually not opening up or is faulty for some reason.

Did you make sure to bleed the air out of the cooling system when you refilled it with water/coolant? You might have air pockets trapped in your cooling system, causing it to inadequately cool the engine.

welfarepc

if the lower hose is cold the termostat hasnt opened yet. it takes a bit to warm up the car at idle. you will know when your car is at normal operating temperature by the fan turning on/off twice. on the second cycle you are at normal operating temps...


best way ive found to bleed coolant is:

jack up the front of the car, open the rad cap start her up and keep adding coolant when needed. u should see bubbles work their way out of the system.

have u been overheating? if so, you also could have a blown headgasket. check into it.

produca2

Kevin, down here in S.C. our cars seem to run much cooler, unplug the fanswitch and jump it with a paperclip,(or whatever) the fans should come on. if they dont then check the cooling fan relay. if you want some help give me a call, I am local.

clem kevin

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EnjoyTheRideDC2 &raquo;</TD></TR><TR><TD CLASS="quote">Have you checked to see if your fan switch is plugged in or working? Its the brown colored sensor, right on the t-stat cover plate. That sensor will switch the radiator fan on as soon as the engine reaches a certain temperature.

When your car reaches operating temp, both upper and lower hoses are supposed to be warm/hot. If the lower one is cold, the t-stat is usually not opening up or is faulty for some reason.

Did you make sure to bleed the air out of the cooling system when you refilled it with water/coolant? You might have air pockets trapped in your cooling system, causing it to inadequately cool the engine.</TD></TR></TABLE>

i ran the car somewhere between 5-8 minutes, and no bubbles came out, it just kind of overflowed more than anything... should i run it some more? im back in town so i want to get this **** over with by the sunday

goota

bump, i have the exact same problem.

miguel329

had same problem was my fan switch

produca2

yeah you need to let the car run for a while, give it a half an hour just to be safe.

goota

i let it idle for 30 minutes last night. still the same, would I need a new one, or might I have reconnected the plug backwards?

clem kevin

ok, fan is turning on now, great

but when i let the motor run for 10+ minutes all it does is overflow, no bubbles came out until i turned the car off and i got a little bit

produca2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by goota &raquo;</TD></TR><TR><TD CLASS="quote">i let it idle for 30 minutes last night. still the same, would I need a new one, or might I have reconnected the plug backwards?</TD></TR></TABLE>

you can not connect a honda plug backwards. Did you unplug the fan switch and try to jump it with a paper clip?? when you put the paper clip (or small piece of wire stripped at both ends) in the two holes where the metal prongs for the switch go ....while the ignition is on of course, the fans should come on immediately. if not then either the fan or the fan relay is toast.

goota

well i just jumped it right now, and they did come on immediately.

I should have added i installed mishimoto aluminum radiator as well with the new fans and thermostat.

Well the temperature in my car will go to the almost half mark and stay there, from what ive searched is normal. But the upper hose is hot and the lower hose is cold and the fans wont come on, Im assuming thats why the thermostat wont open.

my dad says im just being paranoid because the mishimoto rad is doing its job really good. Maybe I am just being paranoid?

PyroProblem

Ive seen aluminum radiators do such a good job,the car would only start to overheat if sitting still for about 5-7 minutes. Im sure yours is fine. Temps probably stay cool enough, the fan is rarely even needed.
The upper hose will be hot and the lower hose will be cooler. This is the radiator doing it job.
Try this. Put some cardboard in front of your radiator to block the airflow to the radiator. start the car and wait to see of the fans come on. Watch your temp guage when it starts to go above normal.By then your fans should have came on if theyre working.

produca2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by goota &raquo;</TD></TR><TR><TD CLASS="quote">well i just jumped it right now, and they did come on immediately.


my dad says im just being paranoid because the mishimoto rad is doing its job really good. Maybe I am just being paranoid?</TD></TR></TABLE>

I think you might be.

EnjoyTheRideDC2

iTrader: (1)

Do you have an OBD 1 or OBD 2 gsr engine?

OBD 1 motors have a valve you open to release the air in the cooling system.

OBD 2 motors, you have to let the air push itself out by having the radiator cap off the car and letting the cooling system do its work. The overflowing is all part of the system pushing the air out. I usually hold the car at a steady rpm around 1500 to 2000 rpm to put a load on the engine. I think the process takes too long at idle.