Good morning. I'm looking for troubleshooting advice to pin down why my temp gage says hot but a meat thermometer at the radiator reads a normal 170 degrees. What I've done so far:
Replaced the sending unit (twice) and the single wire running to the gage.
Replaced the gage with NOS. Tested new gage by grounding the sending unit wire, and the
gage pegged, so appeared normal.
New water pump, thermostat, drive belt.
Repaired and cleaned heater core. Replaced defroster core.
Replaced all hoses, cleaned all metal Tees.
Cleaned the elbow at the back of the engine block that leads to the heater hose.
Pulled the freeze plugs and cleaned the block. Got about 2/3 of a coffee mug of sand, grit and some casting wire out, but there was almost no minimal rust scale at all in there.
Tuned up the car and have the timing is dead on.
The car shows no symptoms of running hot: no steam or burping of water, no gurgling.
I was very careful to put the gage wires to the same terminals I took them from,
but if they were reversed to begin with, could it cause this?
The gage reading rises at a quick but somewhat normal rate (does not immediately peg) but
once it reaches 2/3 hot, it pegs very quickly.
I am open to ideas.
Regards,
Clarence in Virginia Beach
Replaced the sending unit (twice) and the single wire running to the gage.
Replaced the gage with NOS. Tested new gage by grounding the sending unit wire, and the
gage pegged, so appeared normal.
New water pump, thermostat, drive belt.
Repaired and cleaned heater core. Replaced defroster core.
Replaced all hoses, cleaned all metal Tees.
Cleaned the elbow at the back of the engine block that leads to the heater hose.
Pulled the freeze plugs and cleaned the block. Got about 2/3 of a coffee mug of sand, grit and some casting wire out, but there was almost no minimal rust scale at all in there.
Tuned up the car and have the timing is dead on.
The car shows no symptoms of running hot: no steam or burping of water, no gurgling.
I was very careful to put the gage wires to the same terminals I took them from,
but if they were reversed to begin with, could it cause this?
The gage reading rises at a quick but somewhat normal rate (does not immediately peg) but
once it reaches 2/3 hot, it pegs very quickly.
I am open to ideas.
Regards,
Clarence in Virginia Beach
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