hi all
hope yous can help me
my car 1986 rx7 used to be fine
then one day i blew the rear heater hose
ever since then my car overheats
if i stop at a red light or am caught in traffic it gets really hot
i have changed the thermostat with no improvment
if i drive it till its hot and then park it
you can hear the fluid boiling in the motor
if i fill it with the motor running as it heats up the coolant starts erupting out of the fill hole
please help if u can
thanks in advance

 

are you getting white smoke on startup?

 

Please correct me if I'm wrong. I'm not super experienced but I'm trying to help.
Things you should do...

1)Not drive the car until this gets sorted, trust me its not worth the engine.

2)After the car is completely cool, take of the radiator cap, start the engine and look at the coolant inside the fill hole, fill it up with a little extra coolant if needed, While the engine is idling, and the radiator cap still off check for bubbles coming out of the coolant, grab the throttle cable and rev the engine a little see if the is a steady stream of bubbles that increases when you pull the cable. you need an engine rebuild. This clip is a good example of a bad coolant seal http://www.youtube.com/watch?v=5ORJPY-JJc0 , another on http://www.youtube.com/watch?v=NcweM...eature=related
look for the little bubbles is the second video

3)Check for sweet smelling white smoke coming out of the tailpipes when u run the car. This is a good example of this (http://www.youtube.com/watch?v=nVmuc...eature=related ) However I doubt it will be that much smoke. Also don't freak of if there's a little smoke on start up that isn't always blown seals it could be from a flooded engine or a little bit of oil. Just make sure the smoke isn't sweet smelling. If there is white smoke it is a bad coolant seal and your engine is on its way out.

4)Open the lid of your overflow tank. Is there a strong exhaust smell in there. If so your coolant seals could be bad

5)Read this http://www.aaroncake.net/rx-7/overheat.htm

6)If you are confident that your motor is ok, and that you didn't blow your coolant seals read this. http://www.aaroncake.net/rx-7/cooling.htm

7)Also, since one of your hoses went I would recommend replacing or at least checking all of them.

If anybody has any corrections or something to add please post up.

 

Paulin, you are correct.

That first video was actually my car. It turned out to be a coolant seal and then some...
The front iron had a broken coolant jacket and so did the center iron on the rear rotor side.

 

that sucks, have you rebuilt it yet?

 

I'm parting out what is good from that engine and I have a replacement waiting to be dropped in. I would have rebuilt it if not for the irons being ruined. The engine I have now only has around 80k miles on it and I paid a fraction of the price that I would have spent on rebuilding the other one. Hopefully I'll have her back on the road before the end of the year.

 

yeah man, it seems like it blew the main coolant seals insine the engine. not a pro with rotaries and not sure on what its called but this would be like a blown head gasket on as conventioanl engine. the only way out of this is an engine rebuild. all the best.

 

^^ Incorrect. This irons on which the coolant jackets broke are no good. He would need to get new plates, and yada yada yada. It is cheaper to just buy a motor and drop it in that has been rebuilt then to rebuild one yourself. There a lot of people going tii swap.

A running motor can be had for $700 running rebuilt. It also gives you spare parts, like rotor, housings and eccentric shaft. I would keep it em and use them for another rebuild. Or sell them, you can sell them for half the price of a rebuilt motor.

 

alright
so to update
i ve had car for 2 yearz
last summer i had a lil trouble with overheating (hot weather)
didnt think much of it just keep adding coolant every now n then
during winter i had no problems
towards the end of this summer (hotter than normal weather)
bad overheating and blown hose
fixed the hose
i really have not been driving it much only now n then
but now
last night i had to go 25 miles outta town
decided to see if ol betsy would get me there n back
no over heating problems at all
it was kinda coolish out"??
gauge didnt go above 1/4
i did fill it up before i left with antifreeze
it did smoke
it also smelled of antifreeze when i stopped
how much does it cost to have my problem fixed?
is it hard to do?
thanks again for all you guyz help
send me an address n i ll send ya out a free tee shirt comps of 2hotteez custom apparel in hudson ny
people call me scotty 2hottie
so thatz why i choose 2hotteez as the name of my teeshirt store

 

That is because your combustion pressure is going into your coolant thus geyser. Or overflow tank always overflowing

 

Do the first 3 test I posted, this will tell you if your seals are bad, if your seals aren't bad, read the link I posted and go from easiest to fix to hardest.