Last post on Aug 20, 2010 at 6:46 PM
You are in the Chevy Express & GMC Savana
What is this discussion about?
Chevrolet Express, GMC Savana, GMC Savana Cargo, Van
#19 of 21 gm express van power steering pump problem
Dec 29, 2009 (7:43 pm)
I have an 2005 express cargo van. At about 40,000 miles, it developed a winding noise which appears to be coming from the power steering. I was not notified to change the power steering fluid, nor is it in the owners manual. Upon investigating, I've noticed that the power steering fluid appears to have been overheating. Does anyone know of this problem and how to solve it?
#20 of 21 1998 Savanah 6.5litre turbo
Aug 15, 2010 (10:16 pm)
The van is doing half the minimum mpg.About 7mpg. Garage says the vacuum pump is the cause and are replacing it.
I am a refrigeration/air conditioning engineer but until now was not aware there was a vac pump on these vehicles.They say it controls the air conditioning and fuel system runs continuously with the engine.
Just basically, how does it control the A/C and fuel?
I imagine the fuel is made to evaporate more efficiently but the A/C has its own circulating compressor for the R134a gas used.
I am a British engineer working in Eilat.I have no experience with these very popular vehicles so I would like to learn more.
#21 of 21 vacuum pump replacement on GMC Savanah
Aug 20, 2010 (6:46 pm)
The replacement vac-pump ha improved fuel economy and the A/C flow.It also seems to have improved the auto gear changing.