'93 rx7 coolant boiling?
#1
Can Post Only in New Member Section
Thread Starter
Join Date: Jun 2010
Location: Arizona
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
'93 rx7 coolant boiling?
hello, I just got a used '93 rx-7. The car seemed to have been well maintained, however, I have ran into a problem I have never encountered with any of my previous rx-7's. when I turn the car off I can hear the coolant boiling.. I dont know if this could be due to a rich coolant to water ratio or what, any ideas on what I could do about this would be greatly appreciated.
thanks
thanks
#2
Rotary Enthusiast
iTrader: (34)
Join Date: Apr 2009
Location: japan
Posts: 771
Likes: 0
Received 0 Likes
on
0 Posts
That's actually not uncommon. FD's are heat monsters.
Do you have 2 oil coolers? The additional oil cooler helps A LOT to keep temps down. You could run a lower ratio of antifreeze (but you need some to lube the pump and keep corrosion down). Also do a search on FC thermoswitch, it brings the fans on at a lower temp to help cool things down.
Also just do some low speed easy driving after spirited runs to cool down.
Vented hoods help, it lowered my temps a lot. Or you could just leave the hood open a while to help cool it down when you park it.
Do you have 2 oil coolers? The additional oil cooler helps A LOT to keep temps down. You could run a lower ratio of antifreeze (but you need some to lube the pump and keep corrosion down). Also do a search on FC thermoswitch, it brings the fans on at a lower temp to help cool things down.
Also just do some low speed easy driving after spirited runs to cool down.
Vented hoods help, it lowered my temps a lot. Or you could just leave the hood open a while to help cool it down when you park it.
#3
Moderator
iTrader: (2)
50/50 of antifreeze to water is ideal. the antifreeze increases the boiling point of water. is this boiling sound ur only proof it's running hot or does the temp gauge also indicate this? check to make sure the fan is working properly. could also be the t-stat may be not opening fully or poor flow in the radiator. maybe this boiling water sound isn't the coolant boiling at all but something else that just sounds like it.
#4
Mr. Links
iTrader: (1)
The coolant will expand and contract as it heats up and cools. You may hear noises as coolant is sucked and/or returned from the overflow tank. Also, once the car is off, the coolant is no longer moving so they can be some localized boiling. However, since you just got the car, do a complete coolant flush with a proper water/coolant mixture. Burp the system and see if the noise still persist.
#5
Junior Member
Join Date: Jun 2010
Location: Avondale, AZ
Posts: 10
Likes: 0
Received 0 Likes
on
0 Posts
The coolant will expand and contract as it heats up and cools. You may hear noises as coolant is sucked and/or returned from the overflow tank. Also, once the car is off, the coolant is no longer moving so they can be some localized boiling. However, since you just got the car, do a complete coolant flush with a proper water/coolant mixture. Burp the system and see if the noise still persist.
#6
Can Post Only in New Member Section
Thread Starter
Join Date: Jun 2010
Location: Arizona
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
thanks guys, I did test the coolant mixture and it is pretty rich (-60), The car still has a stock temp. gauge which i hear is not very reliable, however, that gauge does not show the car getting to hot. I have also spoken to the original owner of the car and he informed me that it never had that problem before, so perhaps moving the car from phoenix (1000ft) to the mountains (7500ft) may have a part to play. Would changing out the radiator cap help at all? or is it possible that the thermostat is sticking?
#7
Mr. Links
iTrader: (1)
thanks guys, I did test the coolant mixture and it is pretty rich (-60), The car still has a stock temp. gauge which i hear is not very reliable, however, that gauge does not show the car getting to hot. I have also spoken to the original owner of the car and he informed me that it never had that problem before, so perhaps moving the car from phoenix (1000ft) to the mountains (7500ft) may have a part to play. Would changing out the radiator cap help at all? or is it possible that the thermostat is sticking?
The stock temp gauge is not linear. Basically, the middle of the gauge is a range from around 170F - 240F.
Thread
Thread Starter
Forum
Replies
Last Post
immanuel__7
2nd Generation Specific (1986-1992)
89
09-05-15 10:23 AM
RPOdesign
New Member RX-7 Technical
5
08-27-15 11:42 PM