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Old 07-13-2009, 10:48 AM   #1
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9-5 overheating (Moreboost is stranded)

Imran's newest 9-5 problem:

After driving for about 2.5 miles today he looked down to see that his temp gauge was in the red. He pulled over, shut it down, and waited. He's currently with the car at his father's house with no internet but plenty of time to screw with it.

What I know:

The car is a 1999 9-5 LPT with almost 200,000 miles.
Upper radiator hose is hot (thermostat is opening/pumping)
Heater blows hot (when asked to)
Coolant level looks good.
Engine fan is functioning.
No pressure when popping the radiator reservoir cap (I think this is normal).

Anything else he should check for?
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Old 07-13-2009, 11:13 AM   #2
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headgasket~
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Old 07-13-2009, 11:25 AM   #3
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Oh Noes.
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Old 07-13-2009, 11:40 AM   #4
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There should be pressure when you open the cap.


Can he feel the lower hose at all?
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Old 07-13-2009, 11:50 AM   #5
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Are you sure the fan is fully functional? could be one of the speeds is not working properly.


Also agree that you need to see if the resovoir has pressure to it when the cap is pulled. No oil in the water or vice versa???
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Old 07-13-2009, 11:54 AM   #6
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No oil in water or visa versa, no smoking on start up or anything like that. He's out checking to see if there are any obvious problems around the reservoir at the moment now that palmer confirmed it should have pressure.
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Old 07-13-2009, 11:56 AM   #7
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Stuck thermostat?
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Old 07-13-2009, 11:56 AM   #8
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if the car is overheating while he's moving, i highly doubt it's a fan issue
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Old 07-13-2009, 11:59 AM   #9
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Quote:
Originally Posted by Castor Troy View Post
if the car is overheating while he's moving, i highly doubt it's a fan issue
Not necessarily.... I had a fan timer relay fail on my SPG back in 06 and I was driving on my way to work and looked down and my temp gauge was pegged... ended up blowing a head gasket because of it.

But in the 1st post it said fan is functioning properly and the thermostat is believed to be functioning.... I'd still say the thermostat is junk or there's an air bubble in the system causing a flow blockage.

And yes, the reservoir should have pressure when removing the cap. You should hear a hiss.
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Old 07-13-2009, 12:01 PM   #10
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Quote:
Originally Posted by Castor Troy View Post
if the car is overheating while he's moving, i highly doubt it's a fan issue
Fan works at both speeds.
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Old 07-13-2009, 12:06 PM   #11
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Update:

The top small hose from the reservoir to the pass side of the radiator is cold and has no pressure.
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Old 07-13-2009, 12:09 PM   #12
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is the radiator cold?

i'd bet the radiator is blocked
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Old 07-13-2009, 12:28 PM   #13
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I wonder if its the cap.

Really.

Also, if he has the space/time, you could just drain the coolant, and then refil it.
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Old 07-13-2009, 12:28 PM   #14
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I wonder if its the cap.

Really.

Also, if he has the space/time, you could just drain the coolant, and then refil it.
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Old 07-13-2009, 12:33 PM   #15
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Quote:
Originally Posted by Palmer View Post
I wonder if its the cap.

Really.

Also, if he has the space/time, you could just drain the coolant, and then refil it.
I suggested he check the caps, not sure if he did, I'm thinking that a flush wouldn't harm anything as well.
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Old 07-13-2009, 03:31 PM   #16
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Shouldn't there be a pretty audible ((Pop!!)) when opening the cap?

I had a bad thermostat once that caused my car to overheat as soon as I put any load on it. It would make the car overheat almost instantly, pinning the needle.
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Old 07-13-2009, 04:19 PM   #17
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Im home finally, my dad picked me up. I couldnt flush the system because i didnt have a water hose at the other house. I switched caps but that did nothing.

Few questions i have

There is NO pressure in the reservoir and there should be TONS of pressure in there especially when the car is heating up like it is. Coolants not even bubbling up, so more than likely there i a blockage some where like some of you said. I looked around but i couldnt find anything crimped or bent.

second at first glance the thermostat seemed to working, but now i think its stuck closed. But here is where im confused, if the thermostat is stuck closed the fan should not be turning on because hot coolant isnt getting flushed through the radiator or does that not matter?

Its defiantly not the head gasket, coolant is a nice blue color, no steam from exhaust and the oil looks fine. I dont have a compression tester but i might go out and buy one 2morrow. Ill probably also pull the thermostat out to take a look and see if its truly stuck.

Im starting to hate this car haha
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Old 07-13-2009, 04:57 PM   #18
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Your coolant is blue? I still say its the thermostat. Its a cheap part and even if it isn't the problem, you'd have a new one and one less thing to worry about.
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Old 07-13-2009, 10:37 PM   #19
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yes the coolant is blue, lol i was confused at first but i guess thats what the PO put in? Someguy said they make blue coolant, iv never personally seen it, green orange and clear, never blue.
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Old 07-14-2009, 05:33 AM   #20
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I vote thermostat. Its only $15 at least.
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