| [GMCnet] Water Temp gauge calibration [message #315674] |
Sat, 08 April 2017 19:39  |
kelvin
Messages: 608
Registered: February 2004
Location: Eugene, OR
Karma: 0
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Senior Member |
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Since installing my FiTech fuel injection I've displayed the water temp
on the handheld screen. This told me I was running 145° going down the
road with outside temps near 32°F. The VDO gauge on the dash was
registering ~180°.
I've taken this Christmas trip for over a decade now and just assumed
the GMC had a lousy heater. After covering half of my radiator with a
garbage bag I was please to find I had a pretty good heater. The FiTech
gauge was around 175-180° and the VDO gauge was now registering around
230°.
I have since installed a 195° thermostat and at 55°outside temps my
FiTech gauge says I'm running around ~185° and the VDO gauge is still at
230-ish.
Is there any way I can calibrate the VDO gauge to reflect what I think
is the correct coolant temp? Will a resistor inline change the signal
sent by that sender? A potentiometer so I can dial it in? I know just
enough about electrons to mostly stay out of trouble.
Thanks,
Kelvin
'73 23' in Eugene, OR
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| Re: [GMCnet] Water Temp gauge calibration [message #315741 is a reply to message #315674] |
Sun, 09 April 2017 13:00  |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Senior Member |
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I suspect you may have the wrong VDO temperature sending unit for your gage. I would verify the part number on your gage and order a new sending unit. You could shoot the temperature sender with a lazer temp device to double check your findings.
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: [GMCnet] Water Temp gauge calibration [message #315752 is a reply to message #315741] |
Sun, 09 April 2017 17:09 |
kelvin
Messages: 608
Registered: February 2004
Location: Eugene, OR
Karma: 0
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Senior Member |
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You do buy sensors based on the gauge. I have a 0-250° gauge and can
only assume I bought the 0-250 sender. I should probably see if I can
find the receipt, but I would hope I was smart enough to do that.
Kelvin
On 4/9/2017 11:00 AM, roy keen wrote:
> I suspect you may have the wrong VDO temperature sending unit for your gage. I would verify the part number on your gage and order a new sending unit.
> You could shoot the temperature sender with a lazer temp device to double check your findings.
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