Hey. I'm planning on switching to Evans NPG+ and from what I have read it isn't compatible with any water in the system. I know how to drain the coolant from the radiator, and from the block. I do this every time I change my coolant, to ensure I put as much fresh coolant/water as possible. My concern is that I know some amount of coolant stays in the TB. Will this be a problem when switching over to the Evans, or is draining both the block and the radiator sufficient enough?

 

Do a search here and look for 'Evans' and 'Sierra'.

The instructions are here, probably more than one place.

You need to run the car for a bit on straight Sierra coolant.

 

I heard that one way it can be done is to drain all the fluid, then use a radiator cap where you can attach a compressor and just keep blowing air through the system. It should dry everything up. Sounds practical, but I don't know what radiator cap can attach a compressor.

 

When I converted to NPG I drained the radiator and block. Re-filled with Sierra and ran the car for an hour or so to let it the sierra mix with the remaining coolant in the heater core. After draining the radiator and block again I filled up with Evans, and been fine ever since. There is a small tolerance for water with Evans, they give you test strips.

-Dan

 

Alright. I searched for "Evans NPG+" and all I found were threads where people were taking about how great it was. The problem I'm having is in this Texas heat I'm getting temps around 105C and once up to 113C during city driving with the AC on. Im hoping that switching will help keep it in check. im at a 60/40 water/coolant mix right now.

 

I'd suggest you have something else going on that should be looked before switching to Evan's. Simply switching to Evan's isn't going to automatically make your car run cooler. Some people have noticed slightly increased temps with Evans. Evans just provides more protect at the higher temps (as well as being able to run a low or zero pressure).

What's your cooling setup?

 

I know my coolant system needs some updating. I'm not positive what all the PO did, but the switch to Evans is coming along with an entire cooling system overhaul and vacuum line simplification/emissions removal. I am waiting on the rest of the parts to get here, before I begin.

Parts getting switched out as part of the overhaul:
Megan Racing radiator
Samco radiator hoses
new thermostat
Hose Techniques hose kit
RX7-Guru viton check valves

I am also going to check during the process:
thermoswitch
The lines running to the overflow tank (AST has been eliminated)
OMP and Oil Cooler Lines
Undertray and Ducting

Anything else you guys think I should check while I've got it all out?

 

Looks like a good list. I would just do that and leave out Evan's.