detached vacuum hose

S60TomP · Post by **S60TomP** » 31 Jan 2011, 11:38

2002 S60 non turbo. one of the two narrow vacuum (i assume) hoses coming off of the air filter enclosure dangling loose near the radiator shroud. Coincidently there is a solenoid looking device on the shroud that looks like it's missing a hose.
I'm hoping someone can tell me sort out what should be connected where.

This all came about because codes from my OBD indicated that the car isn't reaching operating temperature; similarly reflected by the dashboard gauge. I initially thought it was a stuck open thermostat but am wonderig if this is somehow related and resulting in an anomolous reading.

I've attached 2 photos to help illustrate. one shows the engine compartment with the various parts annotated. The other shows a closer view of the component attached to the shroud.

Thanks in advance for any insights.

- Tom

Post by **jimmy57** » 31 Jan 2011, 11:54

the solenoid is open, no hose goes on that it is atmospheric vent.
The thermal switch on back of air cleaner top should have two hoses but I can only see the one on the L connector circled.
The gray hard line is all I see in that area, where is the dangling end?

Besides, the DTC for improper warm-up is for the coolant thermostat being stuck open. ECM has time parameters and if it takes too long that code is set.

S60TomP · Post by **S60TomP** » 31 Jan 2011, 12:03

Jimmy,
Thanks for the quick reply.
There are two hoses and the circled L connector is the one further into the compartment. The gray hard line is actually the dangling hose but does not show the end. poor illustration on my part.

S60TomP · Post by **S60TomP** » 31 Jan 2011, 14:13

Added photo to clearly identify target hose

skeeter123 · Post by **skeeter123** » 31 Jan 2011, 14:15

I believe your dangling hose goes to the valve which selects whether your intake air into the air box comes from the air intake(snorkle) plastic pipe (on top of the radiator), or from the hot exhaust-pipe cover. The idea is that in cold conditions, when first starting up, they want the engine to get air that's been passed over/around the exhaust mainfold, and hence is warmer than the air from the forward-facing snorkle.

Following your plastic intake pipe from the top of the radiator to the airbox, about halfway to the airbox is a control valve, mine has a circular cover on it (very similar to the ones used to cover the headlight bulbs). That is what that vacuum line attaches to.

Some, myself included, think it's a bogus design to solve a not-too serious problem by inserting a potential source of a much more serious problem, namely an intake manifold vacuum leak, in to the design.

S60TomP · Post by **S60TomP** » 31 Jan 2011, 15:18

Thanks skeeter. I found the control but it did have a hose connected; possibly the other line from the filter box - couldn't easily trace it. saga continues...

skeeter123 · Post by **skeeter123** » 31 Jan 2011, 15:24

then it may be the one that goes to the intake manifold. On my 2004 S60 (NA) there's a nipple for that vacuum line (a single nipple, no "vacuum tree") on the front of the intake manifold. It connects to that with a rubber right-angle. If it's come off, I'm surprised you don't have codes for a vacuum leak....

hey, are u checking your codes from a Volvo source? sometimes the OBII codes don't cross over well to Volvo's code-set. What was the code?

S60TomP · Post by **S60TomP** » 31 Jan 2011, 15:55

skeeter - That was it. Doubt i would have found it, thanks. Line broke at the L.

Dummy that i am i didn't get the code, just the associated description - didn't reach operating temperature - or something close to that. Also paid through the nose for the diag only to find out later that Autozone would pull the codes for free. Not my finest hour.

skeeter123 · Post by **skeeter123** » 01 Feb 2011, 06:51

Hope that resolves the temp issue; apparently replacing the thermostat is a bigger deal than one would expect. I'm due to replace mine (110K miles on original) but since Volvo has made the thermostat into a "thermostat assembly" you can't replace just the $10 thermostat, you have to get the >$100 assembly. I think I'll just wait till I see a problem before I do that; and just keep flushing the coolant on a regular basis.