Weird coolant temp spikes.
#1
Weird coolant temp spikes.
Curly finished up my rotrex (75mm pulley) and intercooler install on the VVT motor about a week ago. He also did water pump and pulleys, drained, filled and bled coolant system, also new 180 degree thermostat.
Here's the symptoms.
If I start the car and immediately start driving, just normal driving, no hard pulls. About 8-10 minutes in the drive, as the temp warms up (which is does now way faster than before) it will continue to climb to 220 degrees and stay there about 10 seconds and then drop really quickly to normal temps.
If I warm up the car at idle in the driveway, car warms up to normal temperature.
After driving a while there's nothing odd, even under heavier street driving and pulls accept sometimes 8-9 degrees fluctuation around 185-195. It's a CX racing radiator and OEM cap.
I read in an older post that someone else had this problem due to tstat housing being gunked up.
Here's the symptoms.
If I start the car and immediately start driving, just normal driving, no hard pulls. About 8-10 minutes in the drive, as the temp warms up (which is does now way faster than before) it will continue to climb to 220 degrees and stay there about 10 seconds and then drop really quickly to normal temps.
If I warm up the car at idle in the driveway, car warms up to normal temperature.
After driving a while there's nothing odd, even under heavier street driving and pulls accept sometimes 8-9 degrees fluctuation around 185-195. It's a CX racing radiator and OEM cap.
I read in an older post that someone else had this problem due to tstat housing being gunked up.
#9
Cpt. Slow
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It's worth a check, the lower hose is all sorts of squished around the hot side piping and power steering stuff. I mean, I'm not saying I blatantly ignored a flattened radiator hose, but I might of missed something.
We have considered the drilled tstat, and reroute.
We have considered the drilled tstat, and reroute.
#10
This is a well-known issue with Miatas, and one that I have personal experience with. Both my Miatas have since been converted to back-of-the-head reroutes where the heater hose performs the bypass function. So I don't have to worry about that stupid little nipple and hose anymore.
Last edited by hornetball; 10-09-2016 at 12:21 PM.
#14
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Normal temp range really should be under 185 I would say, if you're using a 180* tstat. If you're going over that, the system is struggling to keep up.
Hornetball nailed it. I had this same problem on my MSM. Drilled a little bleeder hole in the tstat, problem solved. This was on a reroute car.
I expect the bypass hole thingy is clogged. But could also be the lower rad hose as mentioned.
I need a ride.
Hornetball nailed it. I had this same problem on my MSM. Drilled a little bleeder hole in the tstat, problem solved. This was on a reroute car.
I expect the bypass hole thingy is clogged. But could also be the lower rad hose as mentioned.
I need a ride.
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