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Second Generation Legend (1991-1995)

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Old 10-04-20, 04:12 AM   #1 (permalink)
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Hello again.

Today my bottom hose decided to pop off from the engine side. But before that happened, I replaced the radiator cap. The cap is rated at 1.3 bars. The coolant level in the overflow tank prior to this ordeal was just a finger width above max. Coolant does not spill out of the overflow tank.

Driving to a nearby park for a leisurely stroll posed no problems.

However, the journey home was when it happened.

In both situations I drove leisurely.

If my memory serves me right, the specifications of the radiator cap should be between 1.1-1.3 bar.

I also replaced the radiator, top and bottom hoses the thermostat and coolant half a year ago, however didn't replace the hose clamps.

I never had a problem with the bottom hose popping out until today.

So what I'm wondering is...

Who's the culprit here? The new cap or the old clamps? Or both?

Also, while I have your attention, there's a minor leak at the thermostat housing. The housing itself seems fine. Could it be the gasket wasn't seated in properly? I only noticed this recently. It likely has been going on for a period of time, judging by a couple of dried stains.
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Last edited by Underthebluesky; 10-04-20 at 10:58 AM.
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Old 10-04-20, 04:45 AM   #2 (permalink)
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Hello again.

It seems like I made a mistake when choosing radiator caps.

The rating range is 0.95 - 1.25 bar, and not 1.1-1.3 bar as I had previously thought.

Perhaps this rise in rating is the culprit.

Higher rating = higher boiling temperature, which in my mind means the coolant is allowed to get hotter before it reaches boiling temperature and so there is more pressure?

I guess what I'm trying to ask is: does a higher-rated radiator cap increase coolant temperature and/or pressure, or does a higher-rated radiator cap allow more wriggle room for the engine because it increases boiling temperatures?
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Last edited by Underthebluesky; 10-06-20 at 10:28 AM.
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Old 10-05-20, 01:46 AM   #3 (permalink)
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Hello again,

I've just replaced the coolant and the coolant clamps. I've reinstalled the thermostat. I've also bled the system.
The original radiator cap was put back on.

So far I don't see any leaks from the thermostat housing. Nor from the radiator.

However, there's this rhythmic sound, and I think it's coming from the front of the engine.

Here's a video of the rhythmic sound.

https://photos.app.goo.gl/wSpFbPj7nuAadEEM9

Last oil check was last week. No top up was necessary.
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Last edited by Underthebluesky; 10-06-20 at 10:29 AM.
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Old 10-05-20, 02:56 AM   #4 (permalink)
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Hello again.

I've just went for a test drive.

Most of the spilt coolant has been evaporated. At the same time, the sound I described in the above post has all but subsided as well, so perhaps it was something to do with that.

No leaks reported.
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Last edited by Underthebluesky; 10-05-20 at 04:54 AM.
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