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Old 08-14-2002, 02:01 PM   #1
jr34596
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Default overheating issue

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Last edited by jr34596; 11-09-2010 at 04:05 AM.
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Old 08-14-2002, 02:12 PM   #2
ciper
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Default

Id guess that:

Fan clutch crapped out

Car overheated slightly a few times

Head gasket had small leak

Leak pushes into coolant

Coolant boils out slightly

Car overheated again

Head gasket leaks more

Now whenever under load a sufficient amount of combustion gasses leak into the coolant that the rad cap cant keep up and it overheats.

GET A SNIFFER. They are fairly cheap and give you good confirmation.


Why did you post this in the Legacy forum? At least the Service forum would have been slightly on topic
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Old 08-14-2002, 10:24 PM   #3
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ciper i actually posted this in this forum because i am aware of the problems the 2.5 have with head gasket, i was just curious if anyone had an assumption if it was the head gasket. Thanks for your reply.
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Old 08-15-2002, 01:12 AM   #4
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Default Depending on the mileage

If over 60K it could be blocked cats that won't flow well. I've seen this on a couple of other 300ZXs (and other cars too). Usually ends in a blown head gasket, partly from the back pressure, but mainly because you basically run the car harder and harder to compensate for it steadily losing power over the power band. Just some food for thought... and I agree with Ciper... get a sniffer and check it out. Head gasket is more than likely going.

Br, Dale
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Old 08-15-2002, 04:59 PM   #5
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A couple of things to look for:

1. Coolant in the oil, or vice versa.

2. Do a compression test (preferablly leakdown)

3. Headgaskets are a common thing on older Z's, so sounds perfectly logical. I would probably also pressure test the coolant system as well just to make sure everything is in perfect shape there too.

Adam
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Old 08-15-2002, 06:06 PM   #6
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Old 08-15-2002, 06:33 PM   #7
ciper
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One note, dontsuck antifreeze into the sniffer. I made this mistake the first time.

"you will be hurt if you follow my next direction"
This is total shade tree mechanic talk, so just be careful. Ive been chewed out many times for suggesting this:

Taste the antifreeze. Not drink, just taste.

If the gasses are leaking it will turn the coolant to acid. It will be very sour like battery acid. If left too long this will damage engine internals.
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Old 08-15-2002, 08:18 PM   #8
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[VOICE=HOMER]MMMMMMMMM......antifreeze[/HOMER]
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Old 08-19-2002, 02:19 AM   #9
Subietonic
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Quote:
Originally posted by ciper
One note, dontsuck antifreeze into the sniffer. I made this mistake the first time.

"you will be hurt if you follow my next direction"
This is total shade tree mechanic talk, so just be careful. Ive been chewed out many times for suggesting this:

Taste the antifreeze. Not drink, just taste.

If the gasses are leaking it will turn the coolant to acid. It will be very sour like battery acid. If left too long this will damage engine internals.
Just make sure you rinse afterwards. It could leave a foul taste in your mouth for a long, long time otherwise.

Br, Dale
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