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AZTEK GARAGE (Peer Support) => SERVICE RELATED ISSUES/REPAIRS => Topic started by: Bronze Knight on June 16, 2012, 01:53:49 PM

Title: Overheating
Post by: Bronze Knight on June 16, 2012, 01:53:49 PM
So this has been happening on and off for months now.

02 FWD

On in-city rodas my heat gage moves between the 3/4 and the red on the heat guage. I get on the highway and it will move down to 3/4- 1/2 area. The overheat alarm has gone off a few times in stop and go traffic and when I was doing so errands in town. The Rad fans do turn on by them selves (high and low speeds.

What I've done so far.

Water pump (Was broken anyway last winter had to be replaced. Also replaced the serpentine belt while I had it out.)
Rad Cap
Coolant Temp sensor
Oil change (2 weeks ago)
Spark plugs (all 6 was a major PITA)
Spark plug wires (one was broken open any way so I did them all)

I also ran some radiator cleaner through didn't seem to do anything tho. When I refilled the radiator I used premixed 50/50 Dexcool. I drove it around the neighborhood a few times today about 2 miles at 30 MPH or so and it went into the red but I turned it off before the hot coolant alarm went off.

Thought? What else can I check/do?

Title: Re: Overheating
Post by: porschefix on June 17, 2012, 10:36:24 AM
I had basically the same problem, I did all you did plus all the hoses. Mine still gently overheated too the same as yours. The clue mine was giving me was the slightest sweet smell of antifreeze occasionally after driving inside the engine compartment. The antifreeze level on mine seemed steady but WAS going down the slightest bit over 6 months. My problem ended up being the radiator which had the top passenger side encrusted in antifreeze crud on the outside. I should say that there was no visual clue this was a problem until one day I noticed a drip of antifreeze on my driveway and then I knew there was a problem. I had to remove the fans and shroud to see the encrustation. In any case it seems that you most likely have an antifreeze leak somewhere, even if it is so small you cannot locate it or see the antifreeze going down over a short period of time. The other likely place is the head gaskets or intake manifold gaskets. Good luck.

Title: Re: Overheating
Post by: Dumpy on July 23, 2012, 07:44:23 PM
Try to reverse flush the heater core with water hose or compressed air, you'll be surprised!


Title: Re: Overheating
Post by: Bronze Knight on August 26, 2012, 06:40:57 PM
I'll try that. Since I posted I decided to just tear it apart and see what I could find I knew I had a small leak in the lower intake manifold so I went there first.

I found some dirt buildup inside of the LIM. No, I have no idea where it came from.


So I've cleaned all that up and cleaned all the other parts for the new gaskets to go back on. I'm assuming that the dirt was what was causing my overheating issue. But without knowing where it came from their could be more in the system but I don't know where.

Here is where I am as of tonight.