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Old 04-15-2014, 10:41 AM   #1
marsdog
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03 ZX5 2.0L coolant loss problem

Noticed my 03 ZX5 2.0L is 'burning' coolant recently -- lose coolant at approximately 1qt/100mile driving, no trace seen on the ground or from above the engine, no loss sitting in the garage overnight, oil looks clear so far, coolant temperature can still reach the normal range but goes up much slower than normal (e.g. reach the normal mid-range after 30+ min driving).

Any suggestion on diagnose the problem?

BTW: it has 96k miles and I changed the coolant couple weeks ago.


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Old 04-15-2014, 03:02 PM   #2
Leora83
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Check the black plastic pipe that runs along the top of the radiator. Both my Foci have had splits in this little inlet pipe, along the bottom where it's invisible until it blows. I couldn't figure out where my coolant was going either, and it turned out it was spraying a fine mist over the rad and evaporating.
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Old 04-15-2014, 08:36 PM   #3
marsdog
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Quote:
Originally Posted by Leora83 View Post
Check the black plastic pipe that runs along the top of the radiator. Both my Foci have had splits in this little inlet pipe, along the bottom where it's invisible until it blows. I couldn't figure out where my coolant was going either, and it turned out it was spraying a fine mist over the rad and evaporating.
Do you mean the hard plastic tube with two smaller branches, one of which runs into the thermostat housing? Took a quick look there but couldn't find any sign of leaking. How did you eventually figure it out, before it blows?
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Old 04-15-2014, 09:18 PM   #4
marsdog
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Quote:
Originally Posted by marsdog View Post
Noticed my 03 ZX5 2.0L is 'burning' coolant recently -- lose coolant at approximately 1qt/100mile driving, no trace seen on the ground or from above the engine, no loss sitting in the garage overnight, oil looks clear so far, coolant temperature can still reach the normal range but goes up much slower than normal (e.g. reach the normal mid-range after 30+ min driving).

Any suggestion on diagnose the problem?

BTW: it has 96k miles and I changed the coolant couple weeks ago.

Took a closer look at the area below the infamous leaky thermostat housing -- does the very light green stuff look like coolant stain? there is grease-like stuff around the PCV valve, is it relevant?
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Last edited by marsdog; 04-15-2014 at 09:20 PM. Reason: typo
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