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Old 01-04-2009, 10:04 AM   #1
rage557
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Default I may have installed my thermostat upside down

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So I have been having some overheating problems after I flushed my coolant system and I think I may have installed the thermostat upside down.


After starting the car the temp will slowly climb (monitoring with scangauge) up to 180 and then keeps going up still about 220. If I increase the engine speed to 4k rpm or higher, the temp drops right away back to 180 and then slowly starts to climb again. As long as I am below 4k rpm then the temp will keep climbing.

At first I thought it was a bubble in the coolant system. But I came up with a method to remove all the bubbles from the coolant system, which it did, and it did not change the problem.

My guess right now is that at 4k rpm, the water pressure in the coolant system is enough to open the thermostat which causes the cool water in the radiator to flow into the engine and then when the engine speed reduces the thermostat closes again.

So my options are either a faulty thermostat (was just replaced 2 weeks ago) or its installed upside down.

What do you guys think, does my problem solving methodology make sense?
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Old 01-04-2009, 10:16 AM   #2
1alexR6
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I think and just my opinion....But I would say you have a faulty thermostat.. I am pretty sure if you put your therm. in upside down it would not open and you would just overheat.
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Old 01-04-2009, 10:28 AM   #3
rage557
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That would make sense if there is no wax in the thermostat. I would have guess that if there was wax and it wasn't working correctly it would not open at all and even the water pressure could not force it open.
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Old 01-04-2009, 12:01 PM   #4
EastsideLegacy
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Take the thermostat out and see if the spring is facing the block if so you have a faulty if the spring is facing the housing then you put it in backwards..... it happens i did it way long ago.
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Old 01-04-2009, 02:11 PM   #5
rage557
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I just took the thermostat out, it was in correctly, it was also working properly. I testing it by using boiling water. WTF is going on. At crusing speeds the temp should not be climbing up to 220+
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Old 01-04-2009, 02:25 PM   #6
snaggleto0th
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When you bled air out how did you do this? What I do is fill up the cooling system as much as I can. Let the car run and warm up with the radiator cap off, then you'll notice that the water will go down a little after start up so from there you need to fill it up with more. Continue to watch the temp gauge and water level, you'll know when the thermostat opens cause the fans will turn on slightly before the termostat opens. Once that happens becareful cause HOT water may come out of the filler neck of the radiator. Watch the levels and temp still. Once you have done that, let it cycle through a couple times till the car is running at a a steady temp. THIS MAY TAKE A WHILE. Once temps are stable put the radiator cap back on and take it for a short drive and check your temps while your doing this. WHen you arrive back to where your working on your car, turn it off and check the water level in the coolant over flow.

This is how I do it at the shop I work at. Never has failed me yet and I've done this with my WRX as well...
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Old 01-04-2009, 04:14 PM   #7
rage557
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I drove the car untill it was up to temp so the thermostat was open. Then in my shop we opened the radiator cap and put a clear 1.25" tube into the cap. It fit very nicely and actually had a pretty good seal. I filled the tube up with water, about 4 inches about the radiator, and started the car. The tube was about 4 ft long so it would beable to handle excess fluid from the system. I then had a friend raise and lower the engine speed from 0-5k rpm. All of the extra air bubbles came right up through the tube. As did a bunch of sediment.

I'm trying a cemical coolant flush now to see if the radiator is just clogged.
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Old 01-04-2009, 04:19 PM   #8
Hites
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i know when i replaced my water pump, i had to fill my reservoir and radiator numerous times to get coolant throughout the entire system.
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Old 01-04-2009, 04:53 PM   #9
darkness1122
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I agree. I had a similar "problem". It ended up just being a matter of bleeding, cycling, and topping the coolant off.
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Old 01-05-2009, 02:12 AM   #10
rage557
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Problem Solved!!! I drained the coolant system and noticed that there was a significant amount of residue in the radiator tubes. It looked like a combination of rust and other particulates. I figured that if there was a build up there it was built up throughout the coolant system. I used some coolant flush prestone chemical concoction to remove the particulates. I replaced the radiators hoses and then ran the flush in the coolant system for about 3hrs. I then flushed the system again and then refilled the system with coolant. The flush came out pretty f'in dirty so I assume it worked. I then drove from albany,ny to boston,ma and the temp stayed around 191F the entire way. It looks like the entire system was so bogged down with particulates that the system could not equalize.
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