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Old 09-23-2010, 04:45 PM   #1
ThaPuertoRican15
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Default cooland temp gauge always at HOT!!

im not sure what happened...

i turned my car on, and the coolant temp gauge sat at cold and then slowly started to go up...i didnt pay very much attention to it, because that is normal. i looked at it a few minutes later and it was all the way up at hot...i pulled over got out and checked my coolant and everything...im fine with coolant, except for some black looking s*** in the coolant...

so now everyday when i get in my car first thing in the morning, it sits at cold for a sec, then immediately shoots up to HOT..then every time i get in the car and start it up after that, it just shoots straight to hot...

does anyone have any ideas as to why my gauge is sitting at hot all the time?

all suggestions are appreciated.
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Old 09-23-2010, 04:59 PM   #2
LetItSnow
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Quote:
Originally Posted by ThaPuertoRican15 View Post
...some black looking s*** in the coolant...
Any chance your oil doesn't look like just oil?
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Old 09-23-2010, 05:11 PM   #3
ThaPuertoRican15
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Originally Posted by LetItSnow View Post
Any chance your oil doesn't look like just oil?
im not worried about the oil.....im worried about the coolant.

the black S*** isnt oil...idk where you got oil from...
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Old 09-23-2010, 05:27 PM   #4
RaineMan
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*sigh*

Black stuff in the coolant... oil... is a major sign of HEADGASKET FAILURE.

Thus, check the oil and see if there is coolant in it.

It don't take a genius to figure out that they are separate sealed systems... if either is being polluted then you have a big problem.
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Old 09-23-2010, 05:55 PM   #5
ThaPuertoRican15
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Originally Posted by RaineMan View Post
*sigh*

Black stuff in the coolant... oil... is a major sign of HEADGASKET FAILURE.

Thus, check the oil and see if there is coolant in it.

It don't take a genius to figure out that they are separate sealed systems... if either is being polluted then you have a big problem.
headgasket was done aroundd 5k miles ago...
i really dont think that's the problem...
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Old 09-23-2010, 06:07 PM   #6
ThaPuertoRican15
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i checked the oil...not even on the dipstick...

i need to go buy some more and add it in...then ill be able to check it better...
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Old 09-23-2010, 06:07 PM   #7
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Quote:
Originally Posted by ThaPuertoRican15 View Post
i checked the oil...not even on the dipstick...

i need to go buy some more and add it in...then ill be able to check it better...
Losing oil too. Hmm... I'm still leaning towards headgasket here.

Also, does the car sputter, idle funny, or smoke at all?

Have you checked your water pump? Does the upper radiator hose get hot to the touch after a few minutes? Have you bled the coolant system?

Also... this black stuff in the coolant... is it solid or liquid? It is possible that there may be debris blocking your coolant passages.
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Old 09-23-2010, 06:27 PM   #8
ThaPuertoRican15
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Originally Posted by RaineMan View Post
Losing oil too. Hmm... I'm still leaning towards headgasket here.

Also, does the car sputter, idle funny, or smoke at all?

Have you checked your water pump? Does the upper radiator hose get hot to the touch after a few minutes? Have you bled the coolant system?

Also... this black stuff in the coolant... is it solid or liquid? It is possible that there may be debris blocking your coolant passages.
car runs fine.
just did an engine swap, coolant is brand new, only has like 1500miles.
its a mix between solid and liquid. im not sure what it is, but its not oil. coolant is deff flowing cuz the car isnt actually overheating. it shoots to hot early in the morning when the block would still be cold.
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Old 09-23-2010, 08:37 PM   #9
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figured out what the black stuff is...i used a reg. hose as a rad hose for the lines to the heater core as a quick fix for something, and it actually started to melt and break down. as it broke down it started to move through the engine and then collected in the reservoir.

***so, black s*** was the insides of a hose, NOT oil***

i flushed out the rad, the block and the heater core. im going to do t again tomorrow.

also tomorrow im going to take out the thermostat and see if its dirty, or damaged and see if thats the cause of the problem with the gauge.

BUT, i still don't know where my oil is going...
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Old 09-23-2010, 09:44 PM   #10
RaineMan
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hose pieces inside your engine... sounds like loads of fun to come...
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Old 09-24-2010, 04:28 AM   #11
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my temp gauge goes up too but stops at the 3/4 mark. i'm not worried about it unless it reaches the top.
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Old 09-24-2010, 07:40 AM   #12
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Originally Posted by bmobs06 View Post
my temp gauge goes up too but stops at the 3/4 mark. i'm not worried about it unless it reaches the top.
mine sita at the top ALL the time...thats why im woried about it...

like its at the top even when the car is cold...
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Old 09-24-2010, 10:43 AM   #13
yarrgh
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coolant temp sensor.
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Old 09-24-2010, 01:01 PM   #14
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Quote:
Originally Posted by ThaPuertoRican15 View Post
mine sita at the top ALL the time...thats why im woried about it...

like its at the top even when the car is cold...
i sprayed my sensors with some engine cleaner, while i was spraying the engine, and that helped out. but i have a issue of lossing oil every other week???? sometimes i push it to redline but i'm sure it shouldn't be burning a good amount of oil since i only do that when i have to pass people.
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Old 09-25-2010, 06:44 PM   #15
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either sensor is bad or LOL ever heard of a thermostat going bad lmao...there sopost to fail open but have been known to fail partially open or not at all. If so go with a 165 deg thermostat this time..opens way before stock and helps aid in cooling. black stuff huh..did you use any black silicone on the heads along with gaskets some times those pieces can come off fro mthe inside and circulate. Unless the black stuff isn't oil or isn't separated from the coolant you should be ok. Any time you do gaskets or what not always good to replace water pump(oil pump if you need to and thermostat since the motor is already out) other than that you got me buddy good luck.
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Old 09-28-2010, 01:16 AM   #16
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I'd check the t-stat.
Pull it, suspend it in a pot of water on the stove and turn on high. Use a thermometer that will read 150-250* and see if it opens.
If not, replace with a normal OEM replacement t-stat, DO NOT use a low temp t-stat.

If you turn the car on first thing in the morning and it automatically shows it's overheating, you've got a bad sensor or problem with your wiring but your OP makes it sound like it takes a few minutes to overheat.
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Old 09-28-2010, 10:53 PM   #17
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Yeah. I bet your thermostat is sticking. Swap that baby out.
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Old 09-29-2010, 07:32 AM   #18
ThaPuertoRican15
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i talked to a mechanic about the problem. he says its the coolant temp sensor. so i ordered that and will be replacing it when it comes in. that is the only reasonable problem.the coolant wouldnt heat up that fast to shoot the gauge up up within 1 minute of the car idling after sitting all night.
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Old 09-30-2010, 03:56 PM   #19
fultzjason
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Does anyone know of any threads that say how to change the thermostat? I tried to do this myself and I could find it but could not seem to get my hand anywhere near the thermostat. I have an 02 Impreza
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Old 10-07-2010, 03:17 PM   #20
ThaPuertoRican15
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ok, here's the deal...

i did...
-head gaskets
-intake manifold gaskets
-coolant temp. sensor

idling is fixed, but the temp gauge is still all the way at hot all the time.
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Old 10-07-2010, 03:20 PM   #21
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Could be a bad gauge...
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Old 10-07-2010, 04:02 PM   #22
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Could be a bad gauge...
gauge works. i checked it applying the right power and voltage and made sure everything was at the right tolerances.
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Old 10-07-2010, 04:16 PM   #23
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Have you actually got a laser thermometer and measured head and coolant temp? Did you check the thermostat? That is where I would have started, check the temp at the thermostat housing. And the the coolant lines. Check for flow in the lines, you should feel some pulsation in the lines letting you know there is flow. I have seen engines heat up quickly when the water pump is shot as well.
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