I have a 93 RX-7 and i'm having over heating problems and i was looking for some advice on what else i should try. I have replaced my thermostat and that didn't work so i am replacing the water pump next and if that dosen't work i will be flushing the radiator. What else should i try if that stuff dosen't work????

 

When are you overheating? How do you know that you are...temp gauge is above the middle? I just had a fluidyne radiator installed and did the radiator fan mod and I have had 0 problems. Of course i did not have problems prior to that. But here in Austin it has been 100 for like 10 straight days. Have your Factory recalls been done?

 

I started to notice my over heating when i was going up hill and also if i ever raced and also when it was really hot out. My car would get really hot and start to rise near the red line and then my over flow tank would start to lose coolant making it hard to cool my car down. I was planning on getting an upgraded radiator if the rest of the things i tried didn't work, and as for the recalls i'm not to sure of because i have only had the car for a little over a year.

 

Have you tried replacing the radiator & filler caps first? Leakage?

 

Im having the same problem.

Don't change your water pump untill it starts making noises like a bad bearing. I thought the same thing. I am going to just replace my whole cooling system.

 

Mine did the same... Espesally in trafic just sitting their...

Turned out to be my fans... My sort term fix was to run the car with the a/c on because that trigers the fans to go on...


Check your fans....

 

My fans work fine because they come on when it gets hot but it dosen't cool off enough before it overheats. I was also wondering if i had a warped rotor housing if it would cause it to over heat or it just wouldn't work.

 

Ok people, remember the rule of thumb when working on your FD...start with the cheap stuff (price, not quality) and then work your way up.

My advice here would be to check the radiator cap to be sure it's not leaking. If that's ok (and depending on how old it is, you might want to do it anyway since it's cheap and could be a potential problem down the line), then move on. Flushing the cooling system is pretty darn cheap, and if you've got some buildup in your radiator, this may clean it out. If the systems never been flushed (at least not within the recent past), do this.

Now, my philosophy about the cooling system is that you can't run cool enough. Some people disagree, however, with as hot as our FD's run, I'm sure that you won't have any problem heating up that engine bay, even with all of the cooling mods you might do. I replaced the stock radiator w/ the Mazdacomp unit, and thus far I haven't seen much in the way of heat problems (I didn't before, but my radiator was original and I was worried about potential buildup inside it). I haven't done the fan mod yet (not sure if I will), but where I live and how I drive seem to dictate that it's not necessary.

If you can't afford to buy an new radiator, then do the simple stuff. I'd recommend doing the radiator though, if you can swing it.

 

Pull your A/C relay and drive around with A/C button on and blower on MAX. This puts your engine fans on MAX as well, w/o having to compensate the load and heat generated by the A/C. If this doesn't keep you cool then you probably do have more serious cooling problems.

 

i got a fluidyne and its working great as well down here in tx
its been a few weeks now that i HAVENT seen it hit more than 100 outside and its running great
i would say dump the money on the radiator and be done with it man....but check out pulling the relay and everything while youre saving up for the fluidyne

 

I noticed a termperature drop (some) after I replaced the Air Separator Tank with an aftermarket unit from RP. I surmise that this is because the RP tank has a lever top and I was able to burp the air out of the system.

My mechanic says the factory AST goes throuth stages that can be determined by color. The factory original is black plastic, which turns brown and then green as it ages. green is a precursor to bursting. Mine was green with I replaced it.

Based on the limited lifespan of the factory AST, this would be the first thing I would replace

93 Black/Red Interior, Auto, Touring
Pettit column mount boost gauge
RP AST
Efini Y-Pipe.

 

Also be sure to empty the overflow to the full mark or you may fix the problem and not know it , ... not that I would know.

 

Even with my over flow tank in place and toped I had air in the cooling system. I could tell by the water gurgeling sounds the engine made after I shut off the engine. I had to manualy bleed the system. Air in the system will cause over heating.

Kevin

 

forget all this stuff about a/c fuses, just turn on your parking lights, it willa ctivate the fan at like 93C, what you described rising almost to redline is normal for an FD if you do not have the fans on, you can either switch your AC on or your praking lights. if not your fans will only come on at the last minute to save from overheating. if turning you lights on doesn;t work, then look to rad, and Waterpump. but I doubt you will have to.

 

what temp is the factory thermostat rated at?
What replacement is everyone using?
180 degree factory mazda ones?

 

Getting a lower temp thermostat will not help overheating problems. However, your thermostat may not be opening up all the way. An aftermarket AST may help a little (I didn't notice a difference) because it holds more coolant, but the best first step is a coolant drain/fill and new thermostat. If you are overheating at speed, then its not your fans because if you have sufficient airflow, you shouldn't need the fans. Fans on will obviously help, but they shouldn't be necessary. I'm having pretty much the same problem as you (overheats on long hills and gunning it on hot days), and my car is at Mazdatrix right now getting a Fluidyne put in, as well as a temp gauge, and new thermostat. Don't ever let the temp gauge get to the redline. In fact, don't even let it get to the high white line, you'll toast your engine.

 

Ok Guys i'm back but not much to report as of yet, so far i have replaced the thermostat, flushed my cooling system and replaced my water pump, and nothing has worked totally yet. I have noticed it cooling down a little faster but it still overheats. As soon as i get some money i'm going to be looking to buy a fluidline radiator and see how much it helps. But i have another question for you all, last night i was cruseing in my rx-7 and ran across some friends with other rx-7's and one had mentioned that on top of the coolant resovior is a pressure valve and when it pops off it will cause your car to lose coolant and overheat and i was wondering if this has ever happened to anyone else. thanks.