Heater problems

1989 FORD PROBE
110,000 MILES • 4 CYL • FWD • MANUAL
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BRAD KELLER
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Have 89 ford probe. Heater blows cool warm. Engine temp runs 185/190 flushed heater core but didn't help. Put new themastat in,aftermarket gauge I'm out of ideas to check.anything would help. Thanks Brad
Feb 3, 2011 at 3:24 AM
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FIXITMR
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are both hoses at core hot when engine is to op temp?
Feb 3, 2011 at 5:16 AM
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BRAD KELLER
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Top hose is hotter than the lower by touch I did not check with thermometer
Feb 3, 2011 at 12:22 PM
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FIXITMR
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i should add check with the blower fan turned off. if i side is noticeably cooler your core's not flowing enough. and maybe you have a blend door issue? how cold is it where you are? 180 water temp and 0 weather wont make a heater hot. does that motor have a coolant bleeder? air in the lines would cause poor flow. i also heard mazda uses a '2 stage' thermostat`in that motor.
Feb 3, 2011 at 9:10 PM
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BRAD KELLER
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It averages -10 to 40 degrees in the winter. I put a two stage therostat in. the only bleeder thing on the car is on the radiator. I tried to take the plug out but it just spun, it didn't seem to help so I left it alone. I will check the heater hose tomarrow. What temp should the cars thermostat be for temp.
Feb 4, 2011 at 12:58 AM
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FIXITMR
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195 is the temp i am used to but 180 is capable of heating if everything else is good. i think 195 was originally instituted to meet emissions. i see on net others have your same problem.
Feb 4, 2011 at 6:04 AM
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BRAD KELLER
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I checked the heater hoses with heater fan off at running temp. Both hoses where hot bottom hose a little cooler. When I opened the hood I noticed that the top of the radiator was wet. Looks like its seeping out where the tank is clamped to core. Could my heat problem be a bad radiator?
Feb 6, 2011 at 3:06 PM
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FIXITMR
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if antifreeze is leaking out then it's likely air is getting in which could likely effect flow and heater performance.
Feb 7, 2011 at 1:17 AM