Honda 98 CRV temperature gauge goes way up after an hour on hwy

The ac fan only comes on when the ac is on , the engine fan comes on at engine operating temp . few things to check , the radiator core fins are free from rubbish leave or plastic bags , the thermostat is fully open , radiator tubes are blocked with gunk have it flow tested .

Replace the temperature gauge sensor with a new one. It should work. Just to confirm if it is faulty, remove it from the car but have it connected to the car temp meter to monitor the reading. Put your sensor in a pot with water over a fire and boil it. If the temp rises steadily, sensor is okay. If it doesn't, then replace it. Good luck.

You have to thank the Gauge that shuts down your engine when hot bec. it wont knock...you have to clean your radiator and see if the coolant inside it run through the radiator holes to the engine water jacket to make sure your engine will not over heat...For the fans, find the fan relay...it's under the hood in the fuse box...

on tickover, do the fans come on when it gets hot ? if so, the first thing to replace is the thermostat,then see if you have the same "problem".(as its the cheapest and if faulty would give the same symptoms.)

this is normal, the cooling fan of the engine doesn't come on until u are abouut 2/3 of the way to hot zone of gauge, about 225 degrees F. let me kniow if that is the case.

no the surge that high is not normal a normal cold start should go to around 1500 then settle slowly to 750 or so but this all depends on engine temp and ambient air temperature

Obviously the first thing to check is the coolant level, and top it up to the proper mark. If that's been checked and still doing same thing, get back to us/me.

6
Accord Civic CRV CRX Del Sol Odyssey Prelude
85-98 86-98 97-98 85-91 93-97 95-98 85-98 ECT Sensor (Engine Coolant Temperature)
defective circuit or unplugged / defective sensor
10
Accord Civic CRV CRX Del Sol Odyssey Prelude
85-98 86-98 97-98 85-91 93-97 95-98 85-98 IAT Sensor (Intake Air Temperature)
defective circuit or unplugged / defective sensor
16
Accord Civic CRV CRX Del Sol Odyssey Prelude
90-95 88-95 n/a 88-91 93-95 95 88-95 Fuel Injector System
defective circuit or unplugged / defective fuel injector

check your wiring for dirty connections or broken wires, you may have wires that are rubbed through or connectors that are not making full contact. you will need an ohm meter and check wires for continuity. a wiring diagram will be needed.

make sure the antifreeze is full. if so, replace thermostat and refill

It's probably like the old manual fuel gauge needle where it would take longer to get from 'F' to midway than from midway to 'E'. We all know that according to the gauge the last bit of gas goes faster. I think the digital readout is doing the same thing. I don't know why though.