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Old 02-10-2013, 12:09 AM   #1
gamma1232
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Default Engine temp gauge spiked on H in cold weater

I have a 2005 STI that spiked its engine temperature gauge today. Its ~20 degrees out and I was on the highway cruising with traffic when I noticed. I turned to heat on full blast to try and help alleviate some of the heat, but it was blowing cold air. When I plugged my scanner in, the live data for the engine temp said the coolant was 250 degF, but that didn't seem right based on the heat barely working. So I decided to pop the radiator cap off and there was no pressure in the system....If my coolant was actually at 250 wouldn't I have some pressure in the cooling system?

Both my cooling fans are cycling on....does this sound like a bad thermostat or just a bad coolant temp sensor? Im pretty sure my water pump is good, only has 15k miles on (recently replaced).
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Old 02-10-2013, 12:11 AM   #2
h00z0r
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Did you check your coolant level? Also, it's possible the heater core hose blew out, thus no heat
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Old 02-10-2013, 12:12 AM   #3
gamma1232
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coolant level is good, the reservoir is full
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Old 02-10-2013, 12:12 AM   #4
gamma1232
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also with the heat, it got better once I was back in the city and not driving at highway speeds. but when I was driving above 25 MPH the heat would die again
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Old 02-10-2013, 01:08 AM   #5
the suicidal eggroll
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Bubble in the cooling system or a bad thermostat.
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Old 02-10-2013, 10:56 AM   #6
Cathexis
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In a 2005 car, shouldn't the thermostat fail in the open posistion?
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Old 02-10-2013, 11:16 AM   #7
The Salami Dealer
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check for a coolant leak somewhere.. this weather can really dry and and crack rad hoses.. specifically look under the top rad house out of the coolant crossover pipe for signs of leakage
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Old 02-10-2013, 11:23 AM   #8
grknss
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Quote:
Originally Posted by Cathexis View Post
In a 2005 car, shouldn't the thermostat fail in the open posistion?
Yes OEM do.
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Old 02-10-2013, 02:12 PM   #9
h00z0r
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Eggroll is likely right, try burping the system
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Old 02-11-2013, 09:03 AM   #10
LIChuck
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The system froze up and the coolant wasn't circulating, add antifreeze.
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Old 02-11-2013, 10:34 AM   #11
tatoodhye
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Strange- this happened to my friend in the same exact car. This was back many years but he experienced the same thing when i was with him. I havent talked to him for a while but if I can- ill try to find out for you
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Old 02-11-2013, 04:20 PM   #12
gamma1232
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I burped the system this weekend. It looked full when I started (i.e. the radiator was full) but I ran it with the cap off and it ended up taking like 1/2 a gallon of coolant from all the air that escaped. Hopefully that does the trick.

Thanks for all the responses.
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Old 02-11-2013, 06:34 PM   #13
BraveSTi
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I'd say the thermostat chit the bed.
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