Question about 1992 Mazda MX-5

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The heat symbol is appearing on my dashboard of my mazda eunos, do you know what bit is overheating? is it the radiator?

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  • sherbie182 May 11, 2010

    Hi, Check your coolant levels and ensure that's not the problem. Grab a paperclip and use it to short across the '10' and 'GND' terminals in your diagnostic box. Turn your key to 'ON' (don't start the car though) and watch your 'CHECK ENGINE' light on the dash. It should come on solidly for 4s or so, then turn out for 4s. After this specific error codes will be flashed. The first digit of two digit numbers is in long flashes, the second in short. There is a 4s pause between each error code and then the next code is flashed. The codes repeat in an endless loop so you've got tonnes of time to double check. (eg. Code 10 will be 1 long flash and no short flashes, Code 9 is 9 short flashes and code 13 is 1 long flash followed by 3 short flashes) Please post your error codes if you have any. Otherwise, check all your hoses and the radiator for leaks. When the car is at operating temperature (see the temp gauge) check the top hose from the radiator - if it isn't hot, you've probably got a faulty thermostat. These cost all of about $15 - and are pretty easy to replace. Is your temperature gauge showing an overheating issue? Does running the heater in the car help? Is this only happening in town around lights etc? Check your fans run when the car gets hot - if they aren't running you probably need to replace the fan switch. Hope this helps - please let me know how you went. Sherwin



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Check your coolant level and all your hoses first.

Do your radiator fans come on when the engine is hot? If not, you may need to replace the fan switch.

When the engine is hot, is the upper radiator hose also hot? If not, the thermostat is probably faulty and should be replaced. This is cheap and easy to check and replace. Remove the thermostat (at the other end of the radiator hose - you're going to have a bit of a problem with coolant unless you've drained the radiator or you've got a means of holding that hose up) and chuck it into some hot water - if the thermostat doesn't open you need a new one.

It would pay to check your engine error codes in case they can save you some time. If you're driving an American model WITH a check engine light on the dash, put a paper clip between terminal 10 and GND in your diagnostic box (right side of the engine bay near the air intake - has a big DIAGNOSTIC written on it). Then hop into your car, turn the key to ON (but don't start the engine). The light should go on steady - then off for 4 seconds. After this any diagnostic codes will be displayed. Long flashes are for the first digit in a two digit code - short flashes are the second digit. There will be a 4 second pause between each code AND the codes will repeat. If you get codes, record them and post them and I'll see what I can suggest.

Hope this helps

Posted on Dec 13, 2009


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