K!NCH

iTrader: (2)

My strut bar was hitting the one on then engine while I was at my last drift event.

So I was wondering, can the cap on the rad be switched with the one on the engine?

RotaryRocket88

iTrader: (7)

I take it you have one of the weird S4s with two radiator caps, or an aftermarket radiator? They should all be the same 13 lb. caps.

jjcobm

iTrader: (18)

You may find this helpful:

http://www.nopistons.com/forums/topi...ooling-system/

I have no experience with S4's, but from reading that it seems the cap on the T-Stat area is just a filler cap and not a pressure rated radiator cap. Therefore it may cause problems if switched to the radiator since it will allow the radiator to overflow 24/7.

You may have a pressurized cap (has a spring on it) on the engine side and not the original mazda "cap" (no spring loaded) which may make it bulkier, but nothing wrong with this....

K!NCH

iTrader: (2)

Stock rad. Stock caps.

K!NCH

iTrader: (2)

Yeah my old one went (oem mazda) and they gave me a replacement that was bulkier.

K!NCH

iTrader: (2)

What's the deal with aftermarket caps?

jjcobm

iTrader: (18)

You need either a O.E. cap for the engine side or an aftermarket cap that doesn't have a spring to relief pressure (shouldn't be as tall). I suspect you have the latter right now? I don't think anyone besides mazda and mazda suppliers can give you the proper cap but I haven't looked...

K!NCH

iTrader: (2)

Ok I think I understand. But would switching caps work?

LargeOrangeFont

iTrader: (7)

Is there a true radiator cap in both locations? If so yes. If not no.

You can use a radiator cap as a fill cap in a pinch, but not the fill cap as a radiator.

jjcobm

iTrader: (18)

The info is above in my detailed explanation I quoted it at the bottom here

K!NCH

iTrader: (2)

Alright, I understand now. Guess I'll need to find a way to raise the bar or get a thinner cap.