Did the research on the forum, nothing really similar was found... But i do considering about burping the coolant system and see how it works. Heres the problem:

During start up, the coolant temper gauge would lite up and buzzer buzz for like 10-15 secs and go away. I usually like to drive my car slowly and get it warmed up instead of sitting at idle for a long period. So while I am driving, at the first 5-10 mins , whenever I am at a stop, the light would turn on and so is the buzzer. But it will go away after the 10-15 time period. What can be the problem? Theres no coolant leakage, and I do not have to refill any coolants.... It is topped off before.... No engine over heat issues or whatsoever. Any advices would be great. Thank you in advance.

 

There must be a slight imperfection in the harness causing it?? The coolant is what completes the circuit. If memory servers me (it has been a while)... there are 5 connections before that signal makes it back.
Try going over the harness with a fine tooth comb to see if you can find any exposed wires or a clip that is not plugged in all the way?? Not sure if the electrical manual is in pdf format on the web anywhere, but in todays day and age, I am sure it is. I would link you to it if I knew where one was. Good luck

 

Here's some threads you may find helpful:
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/add-coolant-light-level-ok-680918/

Electrical Manual PDF
http://www.wrex-racing.com/html/fd/9...ric_manual.zip

Hope that helps, I would start with the easiest fixes, coolant caps and leak test, a small leak could cause a break in the vacum, then maybe a new sensor, then start tracing the harness back.

 

thank you guys, I appreciated that.

 

wow this is happening to a lot of people lately including me.

i'm going to try replacing my cap on the filler neck and ast, when i lift my hood after i drive my car for a bit i can hear the coolant bubbling in my ast