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Re: 1997 Hyundai Elantra has heat but temp gauge does not...
If the coolant is below a certain level, the temperature sensor will not read anything and the temp gauge will not rise. Replace the cap, and check that you have enough coolant in the system. If this does not solve the problem, you will need to test/troubleshoot the coolant temperature sensor.
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Changing gears and the temp gauge have nothing in common. First, check the coolant level. If gets low an air pocket in the engine will cause the gauge to go high, then back to normal. Next would be to check the wiring. could be the gauge/sensor wire is shorting to ground.
Sounds like it's low on coolant. Check radiator. If low on coolant, heater may not get hot & temp gauge will read hot. The leak could possibly be a coolant leak..? Anti-freeze has a distinct odor when leaking from a hot engine. If that's the case, find the leak and have it repaired.
heater core is probably what was changed,..a little radiator under the dash that the hot water runs through and a fan behind it to blow at it thus giving you heat,...pretty much thats it in a nutshell,...sounds like something still leaking under there, (anti-freeze smell),... fill it back up with anti-freeze (non-toxic type so you don't polute) and drive to where you gotta go,....go to your mechanic to find that leak,.good luck, and do a hole shot for me! thanks, cracklin joe
you need to check your upper and lower rad hoses also your thermostat if in doubt take to a reputable Rad shop and have them look at it threy are usually very good with most rad and overheating problems
with the engine cold remove the radiator cap and check your antifreeze . im sure its low but now we have to find out why its low . look for leaks. filler up and get it warmed up and look around try to find your leak.' good luck