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  #1  
Old July 17th, 2016, 10:46 AM
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Chuck Burrows
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Temperature Gauge / Question 94 D90 NAS

The temp gauge on my 1994 NAS Stock D90 goes up to 85% to H when idling on a hot day. Almost to hot , but not quite. Never overheats. Fan Clutch and thermostat have been replaced. Should I worry? There is a winch in front of radiator. Your thoughts are appreciated.
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  #2  
Old July 17th, 2016, 11:04 AM
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Quote:
Originally Posted by limeport View Post
The temp gauge on my 1994 NAS Stock D90 goes up to 85% to H when idling on a hot day. Almost to hot , but not quite. Never overheats. Fan Clutch and thermostat have been replaced. Should I worry? There is a winch in front of radiator. Your thoughts are appreciated.
What does that guage even mean?
Has it always run at this spot?
I'd get a guage that has real numbers like 195*F and 230*F.
If it reads more towards the lower I wouldnt worry...

Use a laser temp and see what the tstat housing says.


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  #3  
Old July 17th, 2016, 11:10 AM
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Quote:
Originally Posted by limeport View Post
The temp gauge on my 1994 NAS Stock D90 goes up to 85% to H when idling on a hot day. Almost to hot , but not quite. Never overheats. Fan Clutch and thermostat have been replaced. Should I worry? There is a winch in front of radiator. Your thoughts are appreciated.
How is your radiator?
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  #4  
Old July 17th, 2016, 11:15 AM
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Chuck Burrows
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Don't know how radiator is. Recently flushed when thermostat / fan clutch replaced. I don't have a laser temp gauge. Truck has only 32k on it and has sat some over the years. Was thinking about replacing radiator, surprised to see a new radiator is over $800.
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  #5  
Old July 17th, 2016, 11:17 AM
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Quote:
Originally Posted by limeport View Post
Don't know how radiator is. Recently flushed when thermostat / fan clutch replaced. I don't have a laser temp gauge. Truck has only 32k on it and has sat some over the years. Was thinking about replacing radiator, surprised to see a new radiator is over $800.
Check the fins. They rot. Mine did that. Replaced it and never saw the issue again.
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  #6  
Old July 17th, 2016, 11:29 AM
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Chuck Burrows
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Find look great and visual inspection of inside top of radiator looks good. Obviously can't see in core.
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  #7  
Old July 17th, 2016, 11:30 AM
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Does it go back down when you get on the highway?
I had similar readings in my RRC and occurrence was very random. Turned out to be the voltage stabilizer. Not sure if a '94 D90 has one though.
Like Nomar said.... get a real gauge.
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  #8  
Old July 17th, 2016, 11:39 AM
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Chuck Burrows
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Goes back down to middle on highway.
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  #9  
Old July 17th, 2016, 11:41 AM
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Quote:
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Goes back down to middle on highway.
Original radiator?
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  #10  
Old July 17th, 2016, 11:50 AM
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Yup, it is
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  #11  
Old July 17th, 2016, 12:03 PM
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Quote:
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Yup, it is
You have ac?
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  #12  
Old July 17th, 2016, 12:06 PM
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Nope. No A/C.
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  #13  
Old July 17th, 2016, 12:18 PM
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Quote:
Originally Posted by limeport View Post
Nope. No A/C.
Willing to bet anything it's your radiator.
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  #14  
Old July 17th, 2016, 12:29 PM
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So. Best place to get radiator? I assume I should get original LR and not aftermarket.
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  #15  
Old July 17th, 2016, 12:30 PM
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So. Best place to get radiator? I assume I should get original LR and not aftermarket.
Rovers North. They have a aftermarket one people swear by that is probably better quality than genuine.

Get one from them.
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  #16  
Old July 17th, 2016, 12:52 PM
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Factory gauge without the actual readings has always scared me. Here's what to do first, in this order (as Nomar & others suggested):
1) IR gun on the motor itself, preferably at the stat housing and get a reading.
2) Replace the stock gauge with a VDO 310-105 & sender VDO 323-417.

Start with these easy/cheap solutions to determine what your temps actually are before throwing a radiator at anything. But since you did the stat & fan clutch at least you sort of ruled those out as culprits.
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  #17  
Old July 17th, 2016, 01:04 PM
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Second the IR gun. You can get a cheap one for $5 from amazon.

There is no use trying to throw lots of money at trying to solve something that isn't a problem. As others have said, the gauge is almost totally meaningless - with no meaningful scale or gradations.
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  #18  
Old July 17th, 2016, 02:04 PM
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Get a rover gauge and read the temp accurately from the coolant sensor which the ECU uses to know the engine temp.
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  #19  
Old July 17th, 2016, 02:55 PM
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I know it goes against conventional wisdom but it's a simple set up.

If the fan clutch and fan are working, and the head gasket is fine which it probably is, I bet it's the radiator. It's a 30,000 mile truck. I doubt he wants to modify gauges etc.

Bring it to you shop and have them check it. A 22 year old radiator is most likely done even if it looks fine.
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  #20  
Old July 17th, 2016, 03:13 PM
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Infrared temp gun can be a priceless tool and can give you peace of mind or prevent you from really damaging something.

Reminder about the RN sale though. From the RN site:

Use Code 'BREXIT' to Save 15% Through Sunday Only

Out of curiosity , how long ago was the tsat and clutch replaced? Who did it? Have you checked coolant level? When you squeeze the upper radiator hose, do you hear fluid? Burping the air out of the coolant system can sometimes be a real pain.
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