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aj4x
PostPosted: Tue Jan 10, 2012 2:06 pm 
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Joined: Wed Nov 23, 2011 12:58 pm
Posts: 9
Location: Orlando, FL
Hi there.

When I bought my '80 LUV, the needle would always hang out at the 3/4 of the way hot mark, but never got any higher than that. I had an oil leak fixed and after that it started showing all the way hot, all the time. I took it to a mechanic and they changed out the fan assembly and when I picked it up they told me that it's reading hotter than it actually is.

It's still showing all the way hot. It is not steaming. I bought an infrared thermometer. I'm not sure where I am supposed to point it or what is a safe temperature? If it's not really overheating I'll try to buy a new gauge, but if it is I need to fix the overheating issue. I would rather not take it back to the shop.

Thank you!
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jeffklam
PostPosted: Tue Jan 10, 2012 5:26 pm 
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Joined: Wed Nov 16, 2005 3:02 pm
Posts: 297
Location: White Bear Lake, MN
The manual tells you how to take an Ohm reading with a multimeter on the temp sensor cold and hot. I can't remember what the range is off the top of my head. This will at least tell you if your sensor is good or bad. I don't think I've ever heard of a temp gauge going bad on a Luv.

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rondog
PostPosted: Tue Jan 10, 2012 8:56 pm 
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Joined: Sun Jun 06, 2004 11:48 pm
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Location: Whittier, (So). Cal.
You would want to point the infrared gauge at the thermostat housing and or the radiator. I would guess when the truck is fully warmed up it would read up around 170.

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mytmouz
PostPosted: Tue Jan 10, 2012 11:12 pm 
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Joined: Mon Aug 28, 2006 11:54 pm
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Location: Pelahatchie, MS
Take a reading off the lower radiator hose after it is warmed up. The rubber hose will read closer to the actual water temp than any metal part you take a reading of...

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egg
PostPosted: Wed Jan 11, 2012 12:39 am 
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Joined: Sun May 15, 2005 4:57 pm
Posts: 680
Location: Cornelius Ore
A quick check of the gauge: Key on, disconnect the wire from the sending unit, gauge should read cold. Ground the disconnected wire, gauge should read max hot. This means the dash gauge is ok.
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aj4x
PostPosted: Wed Jan 11, 2012 7:57 pm 
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Joined: Wed Nov 23, 2011 12:58 pm
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Location: Orlando, FL
Top radiator hose, various locations on the engine block, thermostat location, reading in the 180-230 range.

Spark plugs 280 (i don't know, we were pointing it everywhere), lower radiator hose 145.

Does this sound right/okay?
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mytmouz
PostPosted: Thu Jan 12, 2012 1:37 am 
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Location: Pelahatchie, MS
Sounds ok. Try the "quick check of the gauge" tip...

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