Heater Core Flush
11-04-2021 | 04:05 AM
#1
Thread Starter
spent so much money
Joined: Jun 2016
Posts: 230
Likes: 23
Heater Core Flush
Does anyone have the heater core flush procedure handy? I've looked but cannot find it, and am away from the place I have my manuals stored.
I'm a little confused, as I've recently had my engine rebuilt, and it's saying in the maintenance following on to flush the heater core if previous engine died of over heating. I suspect my engine did die of over heating.
But I'm a little surprised by the process. As the paperwork says the only way to flush the heater core is by turning the HVAC **** to heat with power applied to the car. In my past experience with cars, admittedly much older than this RX8, all turning the heater **** to heat would do is move a door blocking air to the heater core. As long as coolant is being forced into the heater core, it should not matter if the HVAC is set to heat?
The only reason I care is the current car the engine is going into, applying power would be difficult in it's current state, as it's largely torn apart, due to some wiring needing to be replaced due to some severe corrosion.
Any input appreciated.
I'm a little confused, as I've recently had my engine rebuilt, and it's saying in the maintenance following on to flush the heater core if previous engine died of over heating. I suspect my engine did die of over heating.
But I'm a little surprised by the process. As the paperwork says the only way to flush the heater core is by turning the HVAC **** to heat with power applied to the car. In my past experience with cars, admittedly much older than this RX8, all turning the heater **** to heat would do is move a door blocking air to the heater core. As long as coolant is being forced into the heater core, it should not matter if the HVAC is set to heat?
The only reason I care is the current car the engine is going into, applying power would be difficult in it's current state, as it's largely torn apart, due to some wiring needing to be replaced due to some severe corrosion.
Any input appreciated.
11-04-2021 | 10:14 PM
#2
Pretty simple process.
Pretty sure you need 1/2 inside diameter hose to fit on the ends.
When you are looking directly at them ( the heater core pipes in the engine bay), the left pipe is where you want to push water through, the right(closest to the motor) is where it'll come out (backfllushing).
You can use your garden hose just be careful with the amount of pressure you're pushing..
Final flush should be done with distilled water to get the hose water out. Ive never needed to use a chemical to flush it but I do know some people have used various things, just make sure its well flushed with distilled water before reconnecting to the system.
Reconnect hoses.
Done.
Travis
Pretty sure you need 1/2 inside diameter hose to fit on the ends.
When you are looking directly at them ( the heater core pipes in the engine bay), the left pipe is where you want to push water through, the right(closest to the motor) is where it'll come out (backfllushing).
You can use your garden hose just be careful with the amount of pressure you're pushing..
Final flush should be done with distilled water to get the hose water out. Ive never needed to use a chemical to flush it but I do know some people have used various things, just make sure its well flushed with distilled water before reconnecting to the system.
Reconnect hoses.
Done.
Travis
11-05-2021 | 02:12 AM
#3
Thread Starter
spent so much money
Joined: Jun 2016
Posts: 230
Likes: 23
Pretty simple process.
Pretty sure you need 1/2 inside diameter hose to fit on the ends.
When you are looking directly at them ( the heater core pipes in the engine bay), the left pipe is where you want to push water through, the right(closest to the motor) is where it'll come out (backfllushing).
You can use your garden hose just be careful with the amount of pressure you're pushing..
Final flush should be done with distilled water to get the hose water out. Ive never needed to use a chemical to flush it but I do know some people have used various things, just make sure its well flushed with distilled water before reconnecting to the system.
Reconnect hoses.
Done.
Travis
Pretty sure you need 1/2 inside diameter hose to fit on the ends.
When you are looking directly at them ( the heater core pipes in the engine bay), the left pipe is where you want to push water through, the right(closest to the motor) is where it'll come out (backfllushing).
You can use your garden hose just be careful with the amount of pressure you're pushing..
Final flush should be done with distilled water to get the hose water out. Ive never needed to use a chemical to flush it but I do know some people have used various things, just make sure its well flushed with distilled water before reconnecting to the system.
Reconnect hoses.
Done.
Travis
11-05-2021 | 05:27 PM
#4
Thread Starter
spent so much money
Joined: Jun 2016
Posts: 230
Likes: 23
Disregard, the error was that in the RX7 there is a valve located on the heater core that did indeed require the HVAC setting be moved to heat before you could push fluid through the heater core. That is not the case with the RX8. Paperwork clerical error.
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