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Old 04-15-2013, 14:53   #1 (permalink)
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Question Coolant pressure issue

Hello,
I have a 1998 CV that I have a cooling system problem with. While merging I punched the throttle and immediately started losing coolant. The coolant temp sensor and the housing it’s threaded to blew out of the manifold. The engine hadn’t been running long and the thermostat wasn’t open yet.

This seems odd to me. Has anyone else had this happen to them?

Any ideas as to what might have caused this? I’m leaning towards faulty rad cap and maybe a pluged up hose or blown head gasket.

Also, I found an orange rubber plug loose under the manifold. It looks like it fits over the end of the temp sensor. Is that where it came from?

And one more question, is that sensor housing, with a taper and an o-ring, going to hold if I just press it into the manifold again?

Appreciate any help,
Evan
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Old 04-15-2013, 18:29   #2 (permalink)
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Re: Coolant pressure issue

Do you have the plastic front section on the manifold or is it aluminum?
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Old 04-15-2013, 20:39   #3 (permalink)
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Re: Coolant pressure issue

Bert, the manifold if plastic and has a brass housing for the sensor. I've attached a pictures of the sensor that blew out of the manifold and the orange plug that I found under the manifold.

Tomorrow I'll refill coolant and run the engine to look for anything noticeable symptom to report.
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File Type: jpg IMG_1207.JPG (102.9 KB, 6 views)
File Type: jpg IMG_1199.JPG (123.2 KB, 7 views)
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Old 04-16-2013, 17:32   #4 (permalink)
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Re: Coolant pressure issue

If the front is plastic, I'd replace it. The plug, I haven't seen one like that, so I don't know what that is.
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Old 04-16-2013, 21:23   #5 (permalink)
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Re: Coolant pressure issue

Thanks for the input Bert.

Small confession to make... When this leak happen, I continued driving without stopping to see what the problem was. I figured i would try to make it home and stop if the guage or light indicated it was overheating. The gauge got up to normal and stayed there for the rest of the drive which was about 8 miles/20 minutes. The temp light came on a couple hundred feet from my apartment so i continued to my parking spot. However, when i finally looked under the hood, I found the temp sensor on laying on the valve cover so I guess the guage and light can't be trusted at this point.

I want to make sure the engine doesn't need new rings or something else before I jump into a manifold change.

I forgot to grab a new rad cap on my way home from work so i didn't bother trying to start the engine today. Hopefully tomorrow.
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Old 04-18-2013, 17:55   #6 (permalink)
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Re: Coolant pressure issue

And a new intake manifold it will be.

I replaced the temp sensor, refilled the coolant and started the engine. after 5 minutes coolant started leaking through a crack in the manifold at the sensor boss.
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