Coolant Temp Warning - pegged to red. Holy crap.

[andrewwynn]

Air bubble might affect heat shouldn't affect rad outlet the water pump is low enough air pocket can't stay there.

T-stat best bet. Same symptoms another member had just a few months ago. T-stat wouldn't open properly.


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[Oldmactech]

Yes, with the ign on but not running I see the constant stream.


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[andrewwynn]

It's bled. The problem is with the mainm flow. When there is a big difference in goesin vs goesout of radiator you have no flow


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[Oldmactech]

Logical. Should it be nearly identical temp?


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[Oldmactech]

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[bcredliner]

Originally Posted by Oldmactech

Thinking that too, just refilled the coolant let it idle up to op temp in the driveway.- scanner shows 82c engine coolant 75c radiator exit coolant. Upper and lower hoses fairly tight, hot. Squeezed on both to push any air through. Still no fan connected so it will likely not cool properly.

I assume the engine temp should read a little higher than the coolant exit temp if the radiator is cooling a little.

One odd thing. Other day I drove it a few mins up to temp and all was fine but the next AM the coolant hoses had sucked in on themselves. Some said it’s a bad rad cap. Replaced it with a different but same spec cap.

That mean anything?


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Yes, hose(s) sucked in is an indication radiator cap is malfunctioning which results in a coolant circulation problem. Are you sure the other cap is the same?

[Oldmactech]

Was gonna post, changed caps, new saw hoses sucked I also (after short drive).

Hmm, what causes that? Other than cap fail.


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[bcredliner]

Originally Posted by Oldmactech

What does this tell you?

Still short drive testing after head gasket and a went for a more spirited drive- 50mph for 10 mins or so. Temp got up too high just as I made it home.

Opened the hood and getting some coolant from the reservoir area and when I opened the bleed screw and steam was coming out. Uh oh.

Here’s the deal:

Running with no spinning fan or shroud attached.
Temp- as high as 121 degrees C engine coolant temp, on 65 degrees C radiator outlet temp. Upper radiator hose hot and tight, lower hose not hot but tight.

Must be radiator or something clogged?

Yesterday I did about half as far, temps were good, hoses both hot and full. What broke?


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Testing without the fan or shroud attached is not a valid test of cooling system performance.

[Oldmactech]

Agreed.


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[bcredliner]

Originally Posted by Oldmactech

Was gonna post, changed caps, new saw hoses sucked I also (after short drive).

Hmm, what causes that? Other than cap fail.


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Are you sure the other cap is the same?