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Posted by Dan W (more from Dan W) on Thu, 28 Mar 2002 23:23:21
In Reply to: how do i flush my radiator in my 88 900 8valve?, Joel, Thu, 28 Mar 2002 22:04:58
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Remove T-stat, close housing again, it'll leak a little. Use Prestone Super Flush/other make as directed. Drain system at bottom rad drain, refill sys w water through resevoir, run again. Whenever refilling sys make sure brass vent on T-stat housing is open to allow air to escape.
Next, bypass the heater core and valve by joining the heater in/out hoses located at the firewall. This protects the heater valve from damage - being cautious.
Pick up a Prestone/other flush kit (couple bucks), includes T-fitting w female garden hose connector. Then, using some 1" plumbing fittings (couple bucks) fashion a U-bend-shaped bypass and attach the Preston T-fitting to one end of it. Make the arms of the U approx equal by using diff length pipe or hose scraps. Total U-bend is perhaps 6" in length, 4" across. Attach this to the heater hose in/out hoses, thereby re-completing the flow circuit.
Unhook top rad hose from T-stat housing where it meets rad, leave off. Hook up hose and flush via garden hose - cruddy water will flow both from rad and top rad hose from T-stat housing. Softened water vs. reg stuff would be nice re: fewer minerals.
Re-attach all rad hoses. Fill, run, drain sys to flush out Super Flush still sloshing in heater core sys. Then fill w ?5L coolant (forget), then fill with distilled water up to min+ on resevoir tank. Take time to makes sure all air out of sys, may take a couple runs to do. All above takes maybe 30min (well, except for trip to hardware store for little pipe pieces)
'85 900S 191k
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