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Old 30 Jan 2013, 05:01 pm
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Default 2002 Honda civic, temp gauge on dash jumps up to high and drops back to normal in seconds.?

It happens randomly but now a little more often. I've brought it to 2 different places to do pressure test, etc. first place (dealership) found nothing wrong. Second place found a crack in my radiator which I got fixed. Even when it goes up to high it never smokes like its over heating. The heat in my car has also stopped working.















I was just trying to get some more info. I've heard everything from a bad thermostat to a blown head gasket. Any suggestions?
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Old 30 Jan 2013, 05:16 pm
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Thermostat could be sticking closed, replace it and see if that changes anything
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Old 30 Jan 2013, 05:31 pm
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You have air in the coolant. This is often a real PITA to pin down because it usually masquerades as different issues. Even dealers screw this up.































Follow the procedure listed in Post #2:















http://www.rx7club.com/1st-generatio...issue-1000291/































The reason your temperature gauge jumps to Hot is because the air bubble is significantly hotter than the surrounding coolant. The bubble(s) pass over the gauge sender, the gauge sees the much higher temperature and spikes to the top because it thinks the car is overheating. Once the sender sees coolant, it send the new information to the gauge, which returns to the normal reading (because air bubbles are hotter than coolant).































This symptom along with getting no heat from the heater and sometimes a weird knocking noise heard inside the dashboard are all indicators of air bubbles in your coolant. Although I've only encountered the odd knocking noise once (in a 2000 Neon), the other signs are consistent regardless of make or model.































Air in Coolant happens way too often on RX7s, usually enough to drive the owner crazy with the loud buzzer because an air bubble gets stuck on the coolant level sensor, making the car THINK its coolant is low when it is not. Thankfully, your car doesn't have a level sensor and a buzzer like the 86-91 RX7 does...
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