How to bleed air out of radiator? - ClubWRX Forum - Subaru Impreza WRX and STi Community and Forums

bulletSTI · 05-16-2007, 05:34 PM

Im planning on doing a gauge install next week, and one of the gauges is for water temp. I purchased greddy adapter for easy install which requires cutting top radiator hose. Directions say, " coolant will be spilled so add more as needed, also do not forget to bleed air out of the radiator or engine may overheat." I was wondering if anyone knows how to air bleed the radiator? Thanks

wrx wagone · 05-16-2007, 05:51 PM

1. Open radiator cap.

2. Start car.

3. Wait for car to warm so the thermostat opens.

4. Watch for bubbles and dropping coolant level in radiator.

5. Fill radiator as required.

6. Replace radiator cap once bubbles stop.

7. Fill coolant reservoir to "hot" mark.

8. Drink a beer.

rr1911 · 05-16-2007, 05:54 PM

Quote:

Originally Posted by wrx wagone

1. Open radiator cap.

2. Start car.

3. Wait for car to warm so the thermostat opens.

4. Watch for bubbles and dropping coolant level in radiator.

5. Fill radiator as required.

6. Replace radiator cap once bubbles stop.

7. Fill coolant reservoir to "hot" mark.

8. Drink a beer.

+ 1

could not have put it any better

bulletSTI · 05-17-2007, 06:17 AM

LOL thanks, I just wanted to make sure I have it the right way.

bulletSTI · 05-31-2007, 12:24 PM

Just installed water temp adapter into the upper hose. Tried to bleed the air out like mentioned in this thread, but I have no way of knowing if all air really is out. I had to close the radiator cap as coolant came bursting out after I let the car warm up for 10 mins.

wrx wagone · 05-31-2007, 12:46 PM

Coolant bursting out??!?

Did you open the cap first then start the car, or did you start the car then open the cap?

With the cap off, the coolant system can't build any pressure to "burst".

bulletSTI · 05-31-2007, 05:08 PM

Cap was off at first, then I closed it when coolant started to overflow. I filled the radiator before I started the car. Anyway, gauge install is complete and car does not seem to overheat at this point. The only thing that went wrong is a slight water leak at sensor/adaptor connection. Im going to have to waterproof it some time tommorow.

05-16-2007, 05:34 PM	#1
bulletSTI Registered User Join Date: Aug 2005 Location: Connecticut Posts: 135	How to bleed air out of radiator? Im planning on doing a gauge install next week, and one of the gauges is for water temp. I purchased greddy adapter for easy install which requires cutting top radiator hose. Directions say, " coolant will be spilled so add more as needed, also do not forget to bleed air out of the radiator or engine may overheat." I was wondering if anyone knows how to air bleed the radiator? Thanks

05-16-2007, 05:51 PM	#2
wrx wagone Registered User Join Date: May 2005 Location: Phillytown, PA Posts: 10,722	1. Open radiator cap. 2. Start car. 3. Wait for car to warm so the thermostat opens. 4. Watch for bubbles and dropping coolant level in radiator. 5. Fill radiator as required. 6. Replace radiator cap once bubbles stop. 7. Fill coolant reservoir to "hot" mark. 8. Drink a beer. __________________ JR - 95 STX 2007 Philly & SJR SCCA STX Champion Sponsored by JSC Speed My AutoX Build Thread: Teh Cone Dodgin' STX Wagon

05-31-2007, 12:46 PM	#6
wrx wagone Registered User Join Date: May 2005 Location: Phillytown, PA Posts: 10,722	Coolant bursting out??!? Did you open the cap first then start the car, or did you start the car then open the cap? With the cap off, the coolant system can't build any pressure to "burst". __________________ JR - 95 STX 2007 Philly & SJR SCCA STX Champion Sponsored by JSC Speed My AutoX Build Thread: Teh Cone Dodgin' STX Wagon

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05-17-2007, 06:17 AM	#4
bulletSTI Registered User Join Date: Aug 2005 Location: Connecticut Posts: 135	LOL thanks, I just wanted to make sure I have it the right way.

05-31-2007, 12:24 PM	#5
bulletSTI Registered User Join Date: Aug 2005 Location: Connecticut Posts: 135	Just installed water temp adapter into the upper hose. Tried to bleed the air out like mentioned in this thread, but I have no way of knowing if all air really is out. I had to close the radiator cap as coolant came bursting out after I let the car warm up for 10 mins.

05-31-2007, 05:08 PM	#7
bulletSTI Registered User Join Date: Aug 2005 Location: Connecticut Posts: 135	Cap was off at first, then I closed it when coolant started to overflow. I filled the radiator before I started the car. Anyway, gauge install is complete and car does not seem to overheat at this point. The only thing that went wrong is a slight water leak at sensor/adaptor connection. Im going to have to waterproof it some time tommorow.