Honda Car Forum

Car overheats when driving, but when at a red light or at idle the car temp
drops. Thermostat works and so does the waterpump. replaced coolant temp
sensor, but the problem is still happening

Helpme24 wrote:
> Car overheats when driving, but when at a red light or at idle the car temp
> drops. Thermostat works and so does the waterpump. replaced coolant temp
> sensor, but the problem is still happening

Have you changed coolant lately? Try bleeding the cooling system it
does strange things if there is air in the system.
ernie

"ernie" <ernests131@charter.net> wrote in message
news:1139604506.003476.176550@o13g2000cwo.googlegr oups.com...
>
> Helpme24 wrote:
>> Car overheats when driving, but when at a red light or at idle the car
>> temp
>> drops. Thermostat works and so does the waterpump. replaced coolant temp
>> sensor, but the problem is still happening
>
> Have you changed coolant lately? Try bleeding the cooling system it
> does strange things if there is air in the system.
> ernie

Also, is the thermostat OEM? If not, replace it.

How many miles and years on the thermostat? If over ten years or 100k miles,
replace.

On Fri, 10 Feb 2006 10:23:24 -0500, "Helpme24"
<michael.s.phelps@uscg.mil> wrote:

>Car overheats when driving, but when at a red light or at idle the car temp
>drops. Thermostat works and so does the waterpump. replaced coolant temp
>sensor, but the problem is still happening


Are your fan(s) coming on?

"Helpme24" <michael.s.phelps@uscg.mil> wrote in
news:be1262c4a852608726fab2e73e236f7e@localhost.ta lkaboutautos.com:

> Car overheats when driving, but when at a red light or at idle the car
> temp drops. Thermostat works and so does the waterpump. replaced
> coolant temp sensor, but the problem is still happening
>


Sure sound like poor circulation due to a plugged rad. Pull the cap off
with the engine cold. Peek inside. What do the tubes look like?

--
TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/

Helpme24 wrote:
> Car overheats when driving, but when at a red light or at idle the car temp
> drops. Thermostat works and so does the waterpump. replaced coolant temp
> sensor, but the problem is still happening
>
how do you know the thermostat works? how did you test it?

| >> Thermostat works
He already checked thermostat*, you twit

| thermostat OEM? If not, replace it.
Why must * be OEM ? You just want to sell OEM parts.

| If over ten years or 100k miles, replace.
My F20A's * was made in 1990, & is still fine. * is not known to often fail
www.d-a-p.com/askus.htm. For the same amount of time to replace *, user
can chk either * by dipping * in hot water & see if it opens / connects
current ( to activate the relay which controls fan motor ).
http://hostingprod.com/@aa1car.com/library/overheat.htm

"TE Cheah" <no@spam.biz> wrote
> | thermostat OEM? If not, replace it.
> Why must * be OEM ? You just want to sell OEM parts.

non-OEM may have different temperature set points. This part doesn't cost
much. A little more for OEM, and hence certainty in the temperature
setpoints, is a good investment.

> | If over ten years or 100k miles, replace.
> My F20A's * was made in 1990, & is still fine.

Performance degrades with time.

| OEM, and hence certainty in the temperature
| setpoints, is a good investment.
My OEM Toyo radiator ( model # 60300 AF ) 's cap puts too little
pressure on coolant : when hot, coolant's air bubbles appear / expand,
so ~1½ cc of coolant always got pushed out of cap & into overflow-
bottle. If I buy a new cap, I'll avoid OEM / Toyo.
I put a o-ring onto cap's bottom seat for cap's gasket to press onto, to
increase cap's spring's pressure on coolant, www.barsleaks.net/faq.html
then cylinder head's water's maximum temperature is lower, because
air bubbles are now smaller so heat can be transferred out fstr : now
tmprtre does not ( used to ) reach the top left corner of my '90 accord
( tmprtre gauge lacks calibration ) 's gear position indicator's D3 box,
in 29°C ambient air. Before I got this new low max tmprtre, I sought
an aluminium radiator to replace my OEM radiator.

| Performance degrades with time.
Bullshit, a thermostat* can work like new unless damaged by over
heating, this is why no car maker's service schedule includes changing
*. In 6-05 I tested my 15yr old * by dipping it in hot water, it opened
fine ( start @ 78°C, fully by 90°C, as specified by honda ).
U just want to push & sell OEM parts.

TE Cheah wrote:
<snip>
>
> | Performance degrades with time.
> Bullshit, a thermostat* can work like new unless damaged by over
> heating,

dude, that's not correct. thermostats rely on springs, seals and a wax
plug. they all degrade with time and usage.

> this is why no car maker's service schedule includes changing
> *.

some manufacturers don't specify transmission oil changes either - does
that somehow mean that the transmission won't benefit from being changed?

> In 6-05 I tested my 15yr old * by dipping it in hot water, it opened
> fine ( start @ 78°C, fully by 90°C, as specified by honda ).
> U just want to push & sell OEM parts.

i may not care for all of elle's comments, but regarding oem parts for a
honda, she's on the money. if you're a ford or chevy man, sure,
after-market is just as good if not better than the junk oem those
manufacturers use. but honda? honda spec parts are invariably much
superior quality. especially for things like thermostats.