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Old 11-01-2013, 03:53 PM   #1
Shockingtaco
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Overheating when in idle

So about 4 months ago I replaced my thermostat due to idle overheating, and a few weeks ago I was driving and as I came to slow down I noticed movement of the needle went right into red. I don't think it's the expansion tank because I see no fluids leaking out of the vehicle, both fans seem to work when the car is on, I get the loud fan sound when accelerating still, but the vehicle keeps overheating if idles for too long, since then I've garaged it and choose another vehicle. Any ideas as to what it may be? Thanks for any help.
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Old 11-01-2013, 05:41 PM   #2
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Test the mechanical fan to be sure. Roll up newspaper and with the engine idling stick to the fan blades. If the fan stops easily, it's toast.
Other than that, maybe there is air in the system?
I would also monitor the exact temperature with the OBC, the temperature gauge isn't accurate.
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Old 11-01-2013, 06:14 PM   #3
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Also make sure your cooling system is bled properly.

Note that these thermostats almost always fail open.

If there is no air in the cooling system, also keep in mind the water pumps split on the shaft and the impeller can slip.

Check the 3rd link below in my signature for more thermostat and engine temperature info.

Check the temp on the Hidden OBC Menu.

Also check the sensor in the lower radiator hose, if there is any moisture on or below the sensor, replace the O-ring, part number is in my signature.
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Old 11-01-2013, 06:22 PM   #4
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sounds like a worn water pump.
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Old 11-02-2013, 02:04 AM   #5
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Likely you've got a blown head gasket. Air is getting pushed into the coolant causing massive air pockets and overheating.

Do this test when fully cold:
- crack open the expansion tank cap to relieve any pressure, close it up tight.
- start the engine, rev it up to 3K RPMs a few times, then shut it off.
- crack the expansion tank cap open again and listen for a pressure release.
If there is pressure, you have a blown head gasket.

Last edited by BaliDawg; 11-02-2013 at 02:06 AM.
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Old 11-02-2013, 02:19 AM   #6
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first of all, pressure test your cooling system and radiator reservoir cap and then report back. like what jfoj said, these thermostats can fault open, or just fault in general. it sometimes won't throw a check engine light but it will be stored in the dme.

but first step is to pressure test ur system and cap.

if your scared its a blown head gasket, looks for signs of mixture (oil and coolant) either on the dipstick or on the bottom of the radiator cap, and compression/leak down test it.

report back, i'm sure guys on here are curious.
good luck.
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Old 11-02-2013, 08:21 AM   #7
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if it were a head gasket or water pupmp it would overheat while he was driving as well. looks like it's only at idle. I say fan clutch.
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Old 11-03-2013, 12:58 PM   #8
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Or the aux fan isn't coming on...
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Old 11-03-2013, 01:52 PM   #9
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I assume the mechanical fan is the one that's belt driven or the one infront of the engine? I just want to make sure I don't mess something up, bit of a noob. :/
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Old 11-03-2013, 01:54 PM   #10
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Quote:
Originally Posted by yeee46 View Post
first of all, pressure test your cooling system and radiator reservoir cap and then report back. like what jfoj said, these thermostats can fault open, or just fault in general. it sometimes won't throw a check engine light but it will be stored in the dme.

but first step is to pressure test ur system and cap.

if your scared its a blown head gasket, looks for signs of mixture (oil and coolant) either on the dipstick or on the bottom of the radiator cap, and compression/leak down test it.

report back, i'm sure guys on here are curious.
good luck.
So even though I just replaced the thermostat it can fault to open?
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Old 11-03-2013, 02:18 PM   #11
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Overheating when in idle

I don't think it's faulting to open especially if you got an OE or oem one. Perhaps the fault lies in components of your cooling system that has yet to be replaced.


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Old 11-03-2013, 02:52 PM   #12
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Also, to add, I recently noticed before the overheating problem, that my car heater would only heat the vehicle for a few minutes, then the cabin air would turn into ambient cool air.... Could this play a major role in deciding what the problem is? Thanks for the help
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Old 11-03-2013, 02:58 PM   #13
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Study bleeding harder and bleed your system a few times.

Cool air from heater is classic bleeding done wrong.

Last edited by Stinger9; 11-03-2013 at 02:59 PM.
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Old 11-03-2013, 03:11 PM   #14
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Originally Posted by Stinger9 View Post
Study bleeding harder and bleed your system a few times.

Cool air from heater is classic bleeding done wrong.
Well in this event, I will have the system bled and report back, hopefully this fixes the issue... My main question is, if the bleeding was done wrong by my mechanic in the first place how did I last this long with out overheating problems? Could this mean he only bled the system 1 time instead of 2 or 3?
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Old 11-03-2013, 03:12 PM   #15
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Overheating when in idle

Quote:
Originally Posted by Shockingtaco View Post
I assume the mechanical fan is the one that's belt driven or the one infront of the engine? I just want to make sure I don't mess something up, bit of a noob. :/
Yes


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Old 11-03-2013, 04:07 PM   #16
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Originally Posted by Shockingtaco View Post
Could this mean he only bled the system 1 time instead of 2 or 3?
Yes, therefore achieved marginal performance.

Although my dealer gets it right with only one bleed. They change the coolant and give me the car right away. Drive it away with never a problem. Wonder how they can do it and we can't.
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Old 11-03-2013, 04:12 PM   #17
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Overheating when in idle

I only so it once myself and get it right the first time. Key things to take note is sitting the climate control to correct settings, the center vents with the rolling knob on the 3 red dot, bleeder screw open (I tend I open it up as much as I can short of it coming of), and pour slowly with a funnel in the mouth. If your cooling system is strong you can be lazy and not siphon excess coolant out, however if your system is old, I'd recommend siphoning out extra coolant to reduce stress and pressure on the system


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Old 11-03-2013, 04:21 PM   #18
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Quote:
Originally Posted by Shockingtaco View Post
I assume the mechanical fan is the one that's belt driven or the one infront of the engine? I just want to make sure I don't mess something up, bit of a noob. :/
Yes, mechanical fan is belt driven and not electric.
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Old 11-03-2013, 04:38 PM   #19
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Could also be air being pushed into the cooling system causing air pockets. Check for a bad head gasket.

Last edited by BaliDawg; 11-03-2013 at 11:51 PM.
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