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My 1988 Mazda RX-7 Add Coolant light came on and ...

Sent to Car Experts February 14 10:53 AM

My 1988 Mazda RX-7 Add Coolant light came on and buzzes like crazy. I opened the reservior and it is full. All the belts seem intact and tight enough. What else should I check? Also, is the warning light simply an electronic switch that turns on if the reservoir level is low, or is in something in the engine that turns it on? For example the winshield washer fluid warning simply measures the level in the fluid reservoir bottle. When it lights up it is just because it is a low level not becuase there is a failure.

Optional Information:
1988 Mazda RX-7 Convertibl Rotary

Already Tried:
Checked the fluid reservoir, and the belts.

Customer (name blocked for privacy)
Status:  Closed   Value: $10
Answer
February 14 12:44 PM (1 hour and 51 minutes and 9 seconds later)
         
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Danny -- Shop foreman -- 99% Positive Feedback on 331 Car Accepts
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February 14 1:13 PM (28 minutes and 12 seconds later)
         
There is a white plastic jug type in front of the radiator, is this the reservoir you are talking about?   I am not sure what you mean by a remote reservoir. Is this the one you mean?
Customer (name blocked for privacy)
Reply
February 14 1:59 PM (46 minutes and 50 seconds later)
         
I removed the plastic reservoir and there are no wires coming out of the bottom of it. However on the top of the radiator where this is a cap that has a symbol that you should not touch it with your hand, is a wire coming out of the top. I suspect this is the sensor. When I removed the cap it appears that although the plastic reservoir is full the radiator is not. Looks like there are fins or something in there. Should I pour antifreeze in there?
Customer (name blocked for privacy)
Answer
February 14 3:59 PM (1 hour and 59 minutes and 43 seconds later)
         
ACCEPTEDCheck Mark
YES THE JUG YOU TOOK OF IS AN OVERFLOW JUG AND DOESN'T HAVE THE SENSOR. IT IS IN THE RADIATOR YOU SHOULD TOP IT OFF WITH COOLANT. ALSO IF THE RADIATOR IS LOW YOU SHOULD MAKE SURE THAT THERE ARE NO LEAKS IN THE COOLING SYSTEM (IF YOU ARE UNSURE HOW TO DO THIS TAKE IT TO A SHOP) THE COOLANT HAS TO BE GOING SOMEWHERE. AN INSPECTION AT A SHOP WILL BE A LOT CHEAPER THAN RUNNING THE ENG. HOT AND CAUSING DAMAGE. HOPE THIS HELPSImages available only to Customers.



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Danny -- Shop foreman -- 99% Positive Feedback on 331 Car Accepts
Senior Master Subaru, G.M.Cert.,Honda cert., Dodge Cert., Ford Cert., 2 ASE Master cert.15 yrs exp.
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February 14 5:00 PM (1 hour and 32 seconds later)
         
I called my mechanic and he told me to top off the radiator and replace the radiator cap. He said that because the plastic reservoir was full but the radiator was not and that the cap was not creating the vacuum. It seemed to work.
Customer (name blocked for privacy)
Answer
February 14 7:30 PM (2 hours and 30 minutes and 28 seconds later)
         
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Danny -- Shop foreman -- 99% Positive Feedback on 331 Car Accepts
Senior Master Subaru, G.M.Cert.,Honda cert., Dodge Cert., Ford Cert., 2 ASE Master cert.15 yrs exp.
Reply
February 14 8:35 PM (1 hour and 5 minutes and 21 seconds later)
         
Thanks! I accepted your answer becuase I felt you covered everything there was on the subject. Thank you!
Customer (name blocked for privacy)
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