InoNothingMR

iTrader: (8)

So I drove about 45min (with no issues) out to watch fireworks tonight and afterward started my car and was stuck in traffic idling when I saw my temp gauge climb extremely quickly so I shut off the car off for a few then turned it back on and the temp sat normal for a few minutes then climbed again. Checked under the car and didn't see anything leaking and popped the hood and no weird smells/abnormal temps just putting my hands over top and feeling the heat coming off.

Once I got out of traffic a bit it sat normal temp for a while then climbed then went back down then climbed again over and over. Speed/RPM didn't seem to effect whether or not it climbed or went down. Coolant level is good but the coolant hose felt REALLY hot when I checked that later. Any ideas? Just seems weird for it to spike then go down and be normal then go up again like was. Recently had a clutch job but that really wouldn't affect anything that involves engine temp...

Any ideas?

Thanks in advance.

PatricksEvilEvo

iTrader: (12)

Thermostat. Someone skipped their 60k service.

jonwtf416

iTrader: (6)

^Probably thermostat

CrazyLilPunk

iTrader: (3)

x3 on the T-stat. Its opening at times to cool the car, then seizing back up and causing the car to over heat. The hot rad hose also leads me to believe its the t-stat because the t-stat was keeping the coolant in the hose from circulating through the radiator. just my 2 cents.

InoNothingMR

iTrader: (8)

60k service was done. I'm at 107k now so if I hadn't done that my car would've exploded by now. Getting to the 120k mark where ill get it done again. I will look into the thermostat though, thanks.

InoNothingMR

iTrader: (8)

Replaced the Thermostat. New coolant and everything. Car is still spiking on the temperature gauge... Weird thing is that when I turn the car off then back on once the temp goes up, it resets to the normal temp within a split second. Would this be a sensor issue? Or possibly a gauge gone bad?

adriano_917

iTrader: (14)

Air on the system, coolant temp sensor or gauge reading incorrectly.

svt_lightning01

iTrader: (1)

I would let the car cool down overnight then take off the radiator cap and start the car and let it warm up you may get a little coolant overflow but i doubt it and if any air is in there it will burp out. You can help it along by gently squeezing the upper hose. I had a random spike the other day on my gauge also and when i turned off the ac it immediately dropped to normal and hasn't acted up since. It was 113 heat index also so i'm sure that didn't help things. Good luck bro!

InoNothingMR

iTrader: (8)

Went to go do this after letting the car sit all night and the radiator started to overflow right as I unscrewed the cap without the car running... could it be the car was just that hot from the sun? Or is it something else? Fluid levels are still good too. Also, how safe is it to keep driving the car with this issue IYO? It is my DD so I need it for the 15min drive to work.

nytalonTSi

iTrader: (18)

Check the female clip on the sending unit, it may be loose. It's right in the area where the transmission is, so it's not impossible to bump.

psphinx81

iTrader: (38)

check your ground wire from your intake manifold to firewall ground.. i left mine off and had the same issue, made the gauge read all weird like that

svt_lightning01

iTrader: (1)

The fluid will be up to the very top of the cap so some would come out however once you let some out and the level has backed off 2-3" into the radiator from the top you can start The car and do like I said. if there is air it should burp it out like this. If this doesn't have any air in it the temp sensors are like $25 at advance I think if I'm not mistaken. This is what I would try first since the first is free and second option is relatively cheap

EVO'D8

iTrader: (2)

Sounds like the spike of the temp gauge is a common issue with Evo's yes?

barneyb

Well, you have a very good radiator cap. It held pressure all night.

Coolant is incompressible but expands with heat. Once the engine is cold you will always have vacuum in the cooling system.

Air is compressible. To have pressure after sitting all night the cooling system must contain air.

If the jug has coolant in it then where is the air coming from. I say HG.

InoNothingMR

iTrader: (8)

Ended up being this... Wish I would have looked at this before spending the money on a new Thermostat. Oh well! Tugged on the wire and it basically popped right off. Sometimes I guess its the little things! Thanks for the help/advice.