Power steering foaming - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**James Pierce** · 03-21-2015, 10:41 PM

Swapped engines, now power steering is making noise and foaming. I replaced both hoses and filled with new fluid to cold mark. I ran the engine and turned wheel L and R then it sat overnight, still foams. So how do you get the air out?

nzc10 · 03-22-2015, 02:10 PM

Try turning the steering wheel lock to lock with the engine off a few times

hugger6933 · 03-22-2015, 06:23 PM

I had this problem on a late model truck with a rack a few years ago. Keep in mind that I change quite a few frames on the ones that have the harder hits so I've had my share of the lines loose before never running into this problem to this degree. After the other don't work if it don't work with the wheels pointed straight ahead, crank the engine turn almost to lock one side OR the other then shut it off. that will allow the pump to burp out the air that is causing the cavitation. Jim

**Boog** · 03-22-2015, 08:19 PM

Also the pump can suck in air through a loose return line or return line with a pinhole in it.

EARNHARDT#3 · 03-22-2015, 08:31 PM

Jack the truck up in the front and slowly turn lock to lock a couple times. Check fluid level/top off. Turn lock to lock slowly a few more times. Check fluid level/top off. Repeat this until your level stays the same. Also, make sure you're using power steering fluid not ATF.

03-21-2015, 10:41 PM	#1
James Pierce Active Member Join Date: Feb 2009 Location: Cle Elum, Washington Posts: 164	Power steering foaming Swapped engines, now power steering is making noise and foaming. I replaced both hoses and filled with new fluid to cold mark. I ran the engine and turned wheel L and R then it sat overnight, still foams. So how do you get the air out? __________________ cascadeheavychevy 67 C10 327 4speed 69 C20 350 4WD 4speed 69 C20 350 4WD 4speed 69 C20 350 4 soeed 69 C20 CST 350 Auto 70 C10 307 4speed 71 GMC Supr 350 Auto 70 C10 350 Auto 67 CST 327 Auto

03-22-2015, 02:10 PM	#2
nzc10 Registered User Join Date: Feb 2014 Location: Palmerston North New Zealand Posts: 58	Re: Power steering foaming Try turning the steering wheel lock to lock with the engine off a few times __________________ "I ain't got no time for side tracks!" 69 R/T Charger 72 C10 Chevrolet 85 302 Jaguar 99 955 Daytona 10 1050 Speed Triple

03-22-2015, 08:19 PM	#4
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,543	Re: Power steering foaming Also the pump can suck in air through a loose return line or return line with a pinhole in it. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

03-22-2015, 08:31 PM	#5
EARNHARDT#3 Registered User Join Date: May 2014 Location: PA Posts: 1,417	Re: Power steering foaming Jack the truck up in the front and slowly turn lock to lock a couple times. Check fluid level/top off. Turn lock to lock slowly a few more times. Check fluid level/top off. Repeat this until your level stays the same. Also, make sure you're using power steering fluid not ATF. __________________ 1967 C10, LWB, 250, Powerglide, PS, PB, 3/4 STATIC DROP

03-22-2015, 06:23 PM	#3
hugger6933 Registered User Join Date: Oct 2008 Location: Marianna Arkansas Posts: 7,280	Re: Power steering foaming I had this problem on a late model truck with a rack a few years ago. Keep in mind that I change quite a few frames on the ones that have the harder hits so I've had my share of the lines loose before never running into this problem to this degree. After the other don't work if it don't work with the wheels pointed straight ahead, crank the engine turn almost to lock one side OR the other then shut it off. that will allow the pump to burp out the air that is causing the cavitation. Jim



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