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  #1  
Old July 14th, 2016, 11:00 PM
Michael699
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Michael
1985 110 2.5 Diesel
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Coolant and temp gauge

Hello everyone, just picked up a 1985 110 2.5 diesel and drove it home 50 miles away without any issues. The guy I bought it from seemed to take very good care of it With virtually no rust and purrs like a cat. The only issue I could find was the water temp gage reads hot. The second I started it it went straight to hot and thought it was a faulty gage, I asked him
About the gage and advised me that it has been reading hot since the day he bought it 6 years ago in the uk. I pulled the coolant tank cap off with the enegine mildly warm the coolant was at the very bottom. Is this a normal thing? I know some over flow tanks are uslly empty when warm but damn I nearly lost it. If this isn't normal what's the best coolant to top Off with? I appreciate any other recommdations as well!
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  #2  
Old July 14th, 2016, 11:04 PM
D90rovin
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It may be your sender. Mine is doing the exact same thing and I'm in need of sender replacement.
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  #3  
Old July 14th, 2016, 11:19 PM
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John B.
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Just use normal coolant. Should be about halfway up in the tank.

Check wiring to the sender. Sender is at the back top of the head on the right side standing from the front. Check engine ground and gauge ground. If that is all good, grab a new sender.

The best option is to get a VDO gauge and sender. More accurate and much more readable. Not very expensive.
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Old July 15th, 2016, 07:43 AM
Michael699
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Thanks guys! Just the regular old prestone green coolant then? I will check the wiring as well! Thanks again!
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  #5  
Old July 15th, 2016, 08:39 AM
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If you decide to stick with the factory gauge PM me. I have a new sender for that vehicle leftover from my tdi swap.
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Old July 23rd, 2016, 03:21 PM
Michael699
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1985 110 2.5 Diesel
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Hey guys swapped out the sender and thank you 1 of 40 for sending me a new one. The temp gauge still reads 1/4 when I turn the key to ignition and it goes to overheated after I start it and let it run for a couple minutes. Any idea what could be? Is it a overheating issue?
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  #7  
Old July 23rd, 2016, 04:35 PM
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Quote:
Originally Posted by Michael699 View Post
Hey guys swapped out the sender and thank you 1 of 40 for sending me a new one. The temp gauge still reads 1/4 when I turn the key to ignition and it goes to overheated after I start it and let it run for a couple minutes. Any idea what could be? Is it a overheating issue?
Michael, check all ground wires and battery connections.
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Old July 23rd, 2016, 04:50 PM
Michael699
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I pulled the instrument panel off earlier and everything appeared to be connected and didn't see any corrosion. I will check the battery as well. I do have a voltage meter and it reads 12-14. Maybe too much power going to the gauge? If it is over heating what signs would I see?
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  #9  
Old July 23rd, 2016, 04:58 PM
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My friend, you need to get an IR thermometer.

You made an assumption the gauge is faulty. You are performing drastic action based on this assumption. You have not validated your assumption.

Your first step is to validate your assumption, not to simply tear stuff up. Measure the operating temperature of your truck, then start from there.
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  #10  
Old July 23rd, 2016, 06:00 PM
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Agree, IR gun is handy. $25 at Sears. You should use it to check the temps of the upper and lower hoses, as well as the top/bottom of the rad.
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  #11  
Old July 23rd, 2016, 06:37 PM
Michael699
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Thanks guys! I will go pick one up. What's the prime operating temp I should look for?
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  #12  
Old July 24th, 2016, 07:07 AM
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My tdi temp is typically 185-187f at the tstat housing.
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  #13  
Old July 30th, 2016, 06:28 PM
Michael699
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Sorry guys for the delayed response. I measured a few spots with the IR gun. 170-176df on the upper radiator hose next to the block and 130-140df on the lower radiator hose. I also measured the block itself and that came back at 200df on the dot. The exhaust manifold
Came back around 300df. Just for kicks I measured the temp gauge sensor and that was right at 186df.
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Old July 30th, 2016, 08:53 PM
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sounds normal. The higher temperature you're seeing at the block is most likely an emissivity issue.
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Old July 31st, 2016, 12:54 AM
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I'd swap to VDO. (I did and really like mine.)
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  #16  
Old July 31st, 2016, 08:58 AM
Michael699
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1985 110 2.5 Diesel
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Thank you again for the help! I am thinking VDO is the way to go. I let the enegine cool
Down the other day and left the hood open and when I got in the next day the gauge was on the half way mark. Any recommend sites too pick a VDO gauge up?
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  #17  
Old July 31st, 2016, 09:34 AM
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eGauges.com - Auto Meter, Classic Instruments, Defi, Isspro and VDO Gauges, Senders, Mounting and Accessories
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  #18  
Old August 16th, 2016, 11:24 AM
Michael699
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Hey Guys/Gals I narrowed down to the VDO Vision Black 310-105 and for the sender 323-057 Quick question, there are 3 different VDO Vision Black same model number but the other two ends in a 1 and 2. I understand the #2 includes metric. Do we really need to use it on a 2.5NA?
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  #19  
Old August 16th, 2016, 11:33 AM
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Quote:
Originally Posted by Michael699 View Post
Hey Guys/Gals I narrowed down to the VDO Vision Black 310-105 and for the sender 323-057 Quick question, there are 3 different VDO Vision Black same model number but the other two ends in a 1 and 2. I understand the #2 includes metric. Do we really need to use it on a 2.5NA?
Those are "kits" that include the sender and adapters for the sender. It depends what you want to do. The 323-057 sender is 1/8" NPT which will need an adapter as that is not the size of the port on the engine.
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  #20  
Old August 16th, 2016, 01:10 PM
Michael699
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Will the factory sender work with VDO gauge?
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