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Re: Wait a minute... Posted by Saana88 [Email]  (#207)  [Profile/Gallery]
(more from Saana88) on Sat, 24 Feb 2007 10:16:19
In Reply to: Sorry, didn't put my name on there, same message, tibbidoh  [Profile/Gallery]
, Fri, 23 Feb 2007 17:17:44
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Do you have a turbo or not? The poster says the car is a '91 S 2.1 but in this post you're talking about turbo lines.
The non-turbos have two different-diameter rubber lines carrying vacuum and exhaust vapors from the fitting on the top rear edge of the valve cover to the intake manifold. Those don't have coolant running through them.
Non-turbos also have two idle control tubes running from the intake manifold to the AIC valve. Those don't have coolant running through them.
And finally, there is the throttle heater line that has coolant only running through it (unless you haven't backflushed in a while) that runs from the throttle body to the metal pipe under the intake manifold. That metal pipe connects the 90 degree rubber hose (near the distributor) to the heater hose that should connect to the lower port of the heater valve. The other side of the throttle body heater should connect via a small-diameter rubber hose that is formed into a tee in the other heater hose, which runs from the water pump to the heater valve upper.
The bypass valve is a tee-shaped plastic fitting that turns the above into a pile of spaghetti. It connects the heater valve lower pipe to the heater valve upper pipe.
The top of the T shape interrupts the normal heater valve upper to water pump (side fitting) hose.
The bottom and side of the T shape interrupts the normal under-manifold metal pipe to heater valve lower hose.
The thermostatic valve is between the upper and lower parts of the tee.
I just ordered the final hose I needed to replace all of them on my car. For those of you looking to replace the short, small-diameter hose that runs from the metal pipe to the intake manifold (upper fitting), I got mine from a site sponsor whose name begins with "The" and ends with "site" as part number 7523913. I got the other hoses, including the non-bypass heater hose that runs from the heater valve upper to the water pump side outlet with the small-diameter side hose that runs to the intake manifold lower connection, from a site sponsor whose name starts with "eE" as their part number 7513435.
You can use whatever vendor you want, but only "The..site" has that short upper throttle body to metal pipe hose, as far as I know.
And.... Turbos use different hoses for heater valve to water pump lower side and for the throttle body to metal pipe hoses, if not others. I'm pretty sure the routing is the same, just that some hoses have different lengths or diameters for turbo stuff.
And......... My 8 valve 900 (no throttle body preheater per se) has had high idle issues in cold weather. Nothing serious, just that the idle speed will stay up around 1200 RPM, I believe due to this very problem. So, I recommend you keep the preheater function. For me, intact hoses doing their jobs are more reliable than plugged, severed hoses.
And............ My '92 is losing its bypass valve (the reason I have no heat) as soon as the weather clears 45 degrees for the first time. The valve not only dissolves and leaves you with no heat, but it turns the driver's side of the engine compartment into a freakin' mess. My throttle cable has a 15-degree (sharp) bend in it as soon as it exits from the firewall; that can't be good. There are currently five hoses and a valve where there should be two hoses. Add to that about eight hose clamps to cut your fingers on, and this thing is on its way out. Saab made these cars (99 and 900 series) for 26 years and people survived just fine without the bypass valve. I can see a point if you're running an 82 degree thermostat and an automatic where (if you're lucky enough to keep the stupid thing in third gear) your engine speed is cut in half moving around town, but my five-speeds survive just fine without it.
A note about the picture: AC has been removed from this car, first because it didn't work, second because it's a convertible and it doesn't need to be there, and third because I live in NY so I don't really need it. The engine lifting bracket came out soon thereafter.
And finally, be careful of the heater hose routing whilst making changes to the system. The heater hoses are supposed to cross. I hooked them up with their connections to the heater valve reversed and had very little heat. I'll post the corrected (non-bypass) photo as soon as I get one.
, Fri, 23 Feb 2007 14:35:57, Fri, 23 Feb 2007 16:11:24, Sun, 4 Mar 2007 14:12:30, Fri, 23 Feb 2007 17:17:44, Sat, 24 Feb 2007 10:16:19 <-- Viewing This Message, Mon, 26 Feb 2007 06:43:54
, Sun, 25 Feb 2007 04:58:05, Mon, 26 Feb 2007 18:18:17, Fri, 23 Feb 2007 17:08:15, Fri, 23 Feb 2007 17:21:37
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