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post #1 of (permalink) Old 10-07-2003, 11:27 AM
slugbutt
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Overheating question

1993 Samurai that is not really overheating, has never been in the red. It is just running warmer than it has before.

I have read several posts on here about hoses collapsing etc. So here is what happens. On the highway, after it gets to a normal temp, when I get going at 65-70 mphs (even had it up to 80 one day) the needle moves above the second line on the temp. gauge. Sitting or moving slow in heavy traffic it stays in the middle or just below the lower line on the temp. gauge.

Sound like a hose collapsing? I have noticed that the upper hose has a "bend" in it that looks like it could be tight. I noticed the other day after I had let the engine cool, say 1-2 hoursbest guess. That the lower and middle hoses were cool to the touch, but that the upper hose was still warm, not hot but not cool to the touch.

I have checked the radiator and it is full with no "huge" dinks or dings in the fins.

Is it something to worry about right now or can I wait to replace the hoses etc? My only problem is I am having back problems right now so any repairs may have to wait.

Thanks for the opinions and the help.

Marc
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post #2 of (permalink) Old 10-07-2003, 02:47 PM
 
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Re: Overheating question

I wont say I had a similar problem, but I will say that a voltage irregularity will cause your idiot gauge to not read correctly. It drove me nuts [img]images/graemlins/cussing.gif[/img]until I finally figured out that the temp gauge isnt worth a crap.

Your best bet is to get a manual temp guage installed and dont pay attention to the idiot guage. The install is really easy, the worst part is draining the coolant. Then go from there. Then you can actually see what temp your running at, when the thermostat opens(or doesnt) and what speeds will vary your temp.

My #1 rule on hoses is, if it looks even the slightest bit dryrotted replace it. A $5 dollar hose is better than being left on the side of the road, or burning up your momo. Just my .02

Kamazuki [img]images/graemlins/grin.gif[/img]
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post #3 of (permalink) Old 10-07-2003, 02:51 PM
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Re: Overheating question

Hey Sluggo...

Sounds like the thermostat.... prolly sticking... try taking it out and running it for awhile... see what happens...

just my $.02
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post #4 of (permalink) Old 10-07-2003, 04:16 PM
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Re: Overheating question

Uhh, you don't have a problem, that's normal operating temp.
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post #5 of (permalink) Old 10-07-2003, 04:20 PM
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Re: Overheating question

yup, agree w/ Nowhere.

You ain't gots no problems.
kwit trippin'
Brad.
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post #6 of (permalink) Old 10-08-2003, 06:35 AM
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Re: Overheating question

Kamazuki has a point, one of the guys over here replaced just about everything, rad, fan, head gasket then fitted some aftermarket gauges and it wasn't overheating at all.
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post #7 of (permalink) Old 10-08-2003, 09:31 AM
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Re: Overheating question

To see if it's a voltage (usually ground) problem, warm to normal, rev it up and hold it at freeway speeds. If it's voltage you'll see the gauge move up immediatly as you rev it - gas gauge may move too if it's the instrument panel ground.

While you are doing that, watch the lower hose - if it's collapsing you'll see it. The upper hose won't collapse since it's under pressure, but the lower hose can as it's on the suction side of the pump.

Yes, they can still collapse even when the cooling system pressure's up.

Running without a thermostat will most likely cause even more overheating at speed - as the water flows so fast through the radiator it doesn't get much chance to cool down - unless of course your radiator's partially plugged.
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