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Re: Flushing Coolant Posted by Kevin K [Email] (#374) [Profile/Gallery] (more from Kevin K) on Wed, 4 Apr 2001 21:20:08 In Reply to: Flushing Coolant, Vladimir, Wed, 4 Apr 2001 19:39:35 Members do not see ads below this line. - Help Keep This Site Online - Signup |
someone had good results fron prestone 'super cleaner'. it is a lengthy process. tap water ok for 1st batch or 2, but use distilled on final fill, and the previous one.
buy a new Saab t-stat and seal, if 3yrs old or more.
while your at it, get small mechanic's mirror, remove upper rad hose, and peek into upper rad inlet with flashlite. if core tube inlets stay cruted and somewhat plugged, get new rad.
just use normal green coolant, and change every 2 yrs. extreme cleaning req'd before dexcool is used, and no extended use.
some related info:
** NORMAL, HEALTHY OPERATION
( with 82C T-stat, OEM 92C Fan-switch)
Cruising ..... Runs at 40% on gage (50% with 192F T-stat), warmed up and cruising for 3-5 minutes at 40-60 mph, with AC off. True even in 90F weather. Fans should not be needed cruising.
Stopped ..... In hot traffic, stop and go, or at long idle, gage slowly climbs to 2/3 to 3/4, when fans come on, bringing gage back to about 1/2 before shutting off. This is a NORMAL cycle of the system, not a hot problem. In very cold weather, fan trip point will be a little higher on gage than in warm weather (due to more free convection cooling of the radiator, and location of fan switch).
** ACTUAL GAGE TEMPERATURES
I tested my gage using and infared sensor off the t-stat housing:
gap between gr and red = 235F
99% 230F (top of green)
88% 220F
75% 210F (fans turn on)
67% 200F (fans turn on)
50% 190F (fans shut off)
40% 180F (T-stat opens)
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