RX8Club.com - Overheating!

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- - Overheating! (https://www.rx8club.com/series-i-trouble-shooting-95/overheating-148711/)

Quote:

Originally Posted by Razz1 (Post 3638711)

Have you tried grabbing the fan and trying to spin it?

If you can move it easily the fan is hot.

Even though you see the fan working doesn't mean it is spinng fast enough.

Um, bad idea, the fan may come on at any time, regardless of the car key's position.

Quote:

Originally Posted by Rote8 (Post 4386285)

Um, bad idea, the fan may come on at any time, regardless of the car key's position.

Disconnect the battery.

Overheating?
Try this: impending engine failure due to low compression. Lower compression alters the way the fuel burns in ways the computer cannot correct. This is similar to overly rich mixture but has to do with the compression instead of the mixture.
Check the compression. Complain bitterly to the dealer about heat and potential engine failure. Check your warranty!
This is what happened to me, and how the dealer explained it. Failure at 71k, 104 months = $5200. Corporate HQ "sincerely apologetic"?!

Quote:

Originally Posted by Razz1 (Post 3638711)

Have you tried grabbing the fan and trying to spin it?

If you can move it easily the fan is hot.

Even though you see the fan working doesn't mean it is spinng fast enough.

Quote:

Originally Posted by ASH8 (Post 3639648)

Razz, I think you Definitely Hit the Nail on the head with your advice...;)

Many of these Overheating or Hot engines, or poor Air Cons are due to the fan motors themselves..not sure if they are "wearing out", but they appear to be slowing down.

Ask oneself WHY did Mazda change the Fan Motors in the Series 2 RX-8's, the two Fan Blades are the same, the fan shroud has changed to accommodate the 2 new motors...??

So, You could upgrade with 2 new motors and shroud.??

N3R1-15-150 Motor (2) $59.00 each.
N3R1-15-210A Shroud (1) $92.00
D201-15-T52 Nuts (6) $1.18 each
Or
N3R1-15-025A Fan Set Complete with Blades, Nuts, Motors and Shroud. $366.00

Quote:

Originally Posted by nycgps (Post 3639655)

I replaced Motor #2 once. not because its dead or anything. cuz I turn it with my hand once and it felt like something is "clicking" inside.

hmm, new fan shroud? it might seal a bit better? did an of the cooling passage changed for S2? I never looked at it (like tube goes to ECU, battery box)

Quote:

Originally Posted by DarkBrew (Post 4315185)

Thread resurrection! I often wonder what happens to these guys... was this ever resolved?

Iflood,
Have not done it but understand from WCS who has done it... there is no easy way...
Must drain and pull radiator.

Must do this myself soon as I end up running the fans a lot with the lower turn-on temperatures I have programmed into the ECU

BTW, in 37C weather, stop-and-go traffic, AC on the coolant temps (50% standard antifreeze) never got over 95C

It turned out that one of my fans had failed, which is why I was fine if the car could maintain 25mph or better. When the defective fan was replaced, I also had the BHR radiator and silicone hoses installed. Ironically, 2-3 weeks later, the OEM coolant pump let go (started leaking around the coolant drive shaft connected to the pulley). This was replaced with a REmedy pump. At this point, the only wildcard is the 10 year old thermostat, which seems to take a while to open such that there is a lag in responding to changes in coolant temperatures. I am still using Evans Waterless NPG+. At this point, I'm no longer facing overheating.

04 Rx8 man trans w/140k miles. about two months i replaced the cooling fan, engine was running hot. it has been running GREAT for weeks at about 800-1000 miles a week (yeah a lot). about 3 days ago i noticed that familiar "radiator smell" so i've been paying close attention to the temp gauge and the water. today i stopped on the way home and heard the radiator gurgling checked it out to find the gurgling was from the cap and drain hose, the gauge still showed normal temp (2 tics to the left of center). on my way home (as i paid very close attention to the gauge) the engine started to sound "funny above 4k RPM so i immediately pulled over and checked under the hood and under the car. i checked the oil and it was SCREAMING HOT!!!! i let the car cool down and checked the water - THE RADIATOR WAS EMPTY..?
I don't think the gauge is faulty; it moves from dead cold to normal temp as it has for years and when i had the cooling fan issues it moved to the right past the center
i think it may be the thermostat or possible the water pump..??? Has anyone had similar issues? please help

Check the nipple on the top of the rad...they tend to break off ( plastic tanks)

Otherwise it could be a rad leak, hose, heater hose, water pump...etc

I should of included i replaced the radiator when i replaced the cooling fan

Did you see any leaked coolant anywhere in the engine compartment?

It usually takes a while for the water pump to piss out a lot of water so check the hoses.

There is a metal union on the top rad hose....there are 2 clamps there

Did the drain fall out of the rad?

Heater hose?