91 240SX overheat!
Wayne Tang-Hong Lai
Last Friday my 240SX got overheat, and I had the radiator replaced
because it leaked right beside the radiator cap. Today (Friday again)
the car got overheat again with the new radiator! What could be wrong
with my car? I heard from someone that 240SX's tend to get overheat a
lot, is it true?
Thanks,
Wayne
C.D.Damron
drove my '89, with over 100K miles, from Kentucky to Montana during the
hottest part of the summer with the AC going most of the time. Through
Montana and the Dakota's my speed rarely dropped below 85 on the Interstate.
I had no overheating problems. In fact, the needle was right in the middle,
like it always is.
Sounds like a bad thermostat or some other blockage.
--
Regards,
C.D. Damron
Wayne Tang-Hong Lai wrote in message <395447B5...@xense.com>...
dt
in a 50/50 mix of water and antifreeze
Wayne Tang-Hong Lai <wl...@xense.com> wrote in message
news:395447B5...@xense.com...
Asad Aboobaker
(more airflow through the radiator).
Asad
"C.D.Damron" <dam...@lex.infi.net> wrote:
>I'm not aware of any common overheating problems among early 240SX's. I
>drove my '89, with over 100K miles, from Kentucky to Montana during the
>hottest part of the summer with the AC going most of the time. Through
>Montana and the Dakota's my speed rarely dropped below 85 on the Interstate.
>I had no overheating problems. In fact, the needle was right in the middle,
>like it always is.
>
>Sounds like a bad thermostat or some other blockage.
>
>--
>
>
>Regards,
>C.D. Damron
>
>
>Wayne Tang-Hong Lai wrote in message <395447B5...@xense.com>...
>>Hi all,
>> Last Friday my 240SX got overheat, and I had the radiator replaced
>>because it leaked right beside the radiator cap. Today (Friday again)
>>the car got overheat again with the new radiator! What could be wrong
>>with my car? I heard from someone that 240SX's tend to get overheat a
>>lot, is it true?
>>
>>Thanks,
>>Wayne
>>
>
>
remove "!"s to mail
S. Wong
May I add wrong ignition timing can cause overheat also. And did you flush
the engine block really well and make sure no clogging somewhere?
dt <d...@dt.com> wrote in message
news:_zY45.174$qa5....@nntp0.chicago.il.ameritech.net...
> Are the fans working? Change the thermostat too. I hope you are putting
> in a 50/50 mix of water and antifreeze
>
>
> Wayne Tang-Hong Lai <wl...@xense.com> wrote in message
> news:395447B5...@xense.com...
Wayne Tang-Hong Lai
Thanks for the reply. The fan's working, but I don't know if the ignition
timing is okay. Where is the thermostat? How do I replace it? I replaced the
hose and hopefully that may fix the problem. The hose's so old that it looked
more like plastic than rubber. The car got overheat when I was in the traffic in
the city. I pulled over and waited for 5 minutes and the needle went back to the
middle and I was able to drive on the highway at 70-75mph without overheating.
How strange!
Another problem I have with the car is that I always hear a low noise coming
from the back near the wheels when I back up the car? Is it a brake problem?
Thanks,
Wayne
joh...@my-deja.com
as...@uclink4.berkeley.edu wrote:
The thermostat should be at the end of one of the main rad hoses, in a
aluminum housing going into the engine block.
The thermostat should have been replaced when the rad was replaced, if
it was not i'd find a new garage.
You may have a air lock in the block, which would stop the flow of
coolant thru the motor.
There should be a small bleeder screw, maybe somewhere near the
thermostat housing, if you take out this bleeder screw it will allow
air to escape the engine block.Pour water into the rad,
when the block
is full of coolant it will start to come out the bleeder screw you
removed, just screw the bleeder back in and check both hoses that they
are warm when the engine is warm.
If you live in a warm area you could mix 35%coolant and 65% water,
water tranfers heat faster than antifreeze.
240SX's don't have any common overheating problems.
Good Luck
John
Sent via Deja.com http://www.deja.com/
Before you buy.
Jim Rojas
checked.
Jim Rojas
Wayne Tang-Hong Lai <wl...@xense.com> wrote in message
news:39554AB3...@xense.com...
S. Wong
large hose going to it.
When engine is cold, drain out some coolant & save in container. Drain as
much as necessary so coolant level will be below that of thermostat. Better
let a mechanic do it the first time & watch so you have a better idea next
time.
It is usual & expected, not strange, that a car over heat in slow traffic,.
because less cooling from fan & air against the slowly moving car.
The rear problem can be the wheel bearing, the brake pad wearing thin or
piston hitting rotor. Let mechanic check it out.
( Do check the ignition timing. It may be ok but who knows.)
Dave
Seriously, my 240SX has no overheating problem (1991) and I've never heard this
to be an issue with this car.
Check your thermostat as the previous person said, but also check your fan
clutch. Could be bad.
Dave
Asad Aboobaker
http://www.240sx.org/faq/articles/pics/burphole.jpg
Asad
joh...@my-deja.com wrote:
>You may have a air lock in the block, which would stop the flow of
>coolant thru the motor.
>There should be a small bleeder screw, maybe somewhere near the
>thermostat housing, if you take out this bleeder screw it will allow
>air to escape the engine block.Pour water into the rad,
>when the block
> is full of coolant it will start to come out the bleeder screw you
>removed, just screw the bleeder back in and check both hoses that they
>are warm when the engine is warm.
>If you live in a warm area you could mix 35%coolant and 65% water,
>water tranfers heat faster than antifreeze.
>
>240SX's don't have any common overheating problems.
>
>Good Luck
>
>John
>
>
>Sent via Deja.com http://www.deja.com/
>Before you buy.
remove "!"s to mail
Don Nimi
Wayne Tang-Hong Lai wrote:
> Hi all,
> Thanks for the reply. The fan's working, but I don't know if the ignition
> timing is okay. Where is the thermostat? How do I replace it? I replaced the
> hose and hopefully that may fix the problem. The hose's so old that it looked
> more like plastic than rubber. The car got overheat when I was in the traffic in
> the city. I pulled over and waited for 5 minutes and the needle went back to the
> middle and I was able to drive on the highway at 70-75mph without overheating.
> How strange!
> Another problem I have with the car is that I always hear a low noise coming
> from the back near the wheels when I back up the car? Is it a brake problem?
>
> Thanks,
> Wayne
I'll add fuel to the fire Wayne... of all the 240SX members on the 240SX CCA of
America...I have had THE weirdest overheating problem to date....and have
accumulated a list a mile long of possible repairs and attempts to fix my
overheating problem. I won't go into it here, (as I've had many mechanics attempt
to solve this problem....and no it's not a thermostat...we changed 7 of them, not a
rad cap, changed 5 of them, not the rad, changed and flushed this one, not the water
pump, did 2 of them, and not rad hoses, switched all of them..
(those that remember this problem I have dates back about 2.5 years..and I STILL
have not solved it....I run around with a gutted thermostat to solve the problem.
In the summer it's not a problem, but in winter, it's kinda chilly in my car.
I think it's a blocked hose somewhere in the depths of the stupid
fridgistat/EGR/Throttle body area...and somehow I have a weird blockage that causes
the car to overheat only on certain occasions. You can shut if off for 2 minutes,
and the problem goes away.
And yes..(for those that don't know who the hell I am....) I DO think I"m more than
mechanically capable of diagnosing and solving Nissan 240SX problems. My problem is
not block related, nor is it a leaking head gasket, cracked head... as we've done
leak down tests, compression tests, and CO tests in the rad. I've done thermal
checks for rad hot spots, and physically, this problem should NOT occur, as there is
bypass routes for coolant to flow if the thermostat shuts closed, or certain lines
get blocked.
This weird overheating problem has stumped the BEST of mechanics including my race
engine builder. Short of completely pulling the head and associated lines and
heater core etc. off the street car....we cannot pinpoint WHY my car has this
problem. It's not a major issue, and my car has been testament that you CAN
overheat a KA motor many many times, and not suffer any ill consequences. (and I do
POUND the crap out of my car racing it hard...and driving it really hard on the
street.)
Email me off-list and you can describe EXACTLY what your symptoms are Wayne, and I
may be able to offer assistance.
obi-don
Ray
turned out to be the hose going out of the waterpump collapsed
when hot. The hose had 100k on it and would only fail - collapse
when hot. Worth checking your hoses.
good luck
RS
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