If the hoses are only a year old, they should come off; take a pair of slotted type pliers/grips and you can usually work them back and forth a touch as you pull - tool is set perpendicular to the pipe/hose. Of course don't squeeze too hard, those pipes are soft. If you try to confirm flow thru the core, make sure not to use too much psi, system doesn't run under too much pressure (what 13psi?).
Ross On Apr 10, 2011, at 4:34 PM, Ken Bogart wrote: > I would flush the heater core to verify flow. If its blocked and needs > replacement, a temporary bypass will certainly work to keep you on the road. > > > Ken Bogart > ----------------------------------------------------- > 96 Montego Blue FFS Coldside (His) > 97 Black & Tan (Hers) > 90 Crystal White (sons) > ------------------------------------------------------ > http://www.miatacare.com > http://www.cincimiata.com > http://www.bcchallenger.org > MiataMail.com list owner > > > On Sun, Apr 10, 2011 at 2:32 PM, Bruce Labitt <[email protected]> > wrote: > I'm trying to diagnose if I have either a bad water pump, or just a clogged > heater core. The hose at the output of the heater core has been spliced to > insert a GM temperature sensor in the line. [Other than the temp sensor > splice, the cooling system is stock.] The GM sensor is reading correctly - > it reads cold and the heater line *is* cold. However, at the back of the > head, the sensor which goes to the dash reads very hot (after the engine has > warmed up, of course). It is as if there is no flow out the back of the head. > > Things I've tried: > 0. Removed thermostat, put housing back. Still overheats. Have new tstat, > but have not installed. > 1. Remove GM sensor splice, and inspect the inline housing. Can see > daylight through the hose connections. Conclusion: temp sensor housing is not > clogged and not impeding coolant flow. > 2. Added classic coolant flush tee in place of the inline temp sensor. > Flushed 12 gallons thru system. Pretty ugly looking coolant, if I must say > so. It still does not quite look like clean water, but it is far more water > like than before. > 3. Put back GM temp sensor. > 4. Refilled with water. Installed a burp bucket on radiator, ran engine. > Filled bucket 1/3 way. Bottom rad hose does not seem like it is full of > coolant. Feels like it is not uniformly hot. Tried squeezing hoses, etc to > burp. Not much happened with respect to coolant level. Engine heated up - > back of head sensor showed quite warm - heater core loop quite cool to the > touch. > > What I'm going to do next: > 1. Bypass heater core. Is there an 'easy' way to get these hoses off? I > cut them when I replaced them last summer. Are they 'welded' on by now? > 2. Maybe, flush core, if above works. > > Anything else? > > _______________________________________________ > Miatapower mailing list > [email protected] > http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower > > _______________________________________________ > Miatapower mailing list > [email protected] > http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
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