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Old 10-27-2009, 19:36   #1 (permalink)
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94 Aerostar heater issues

So, my 94 Aerostar runs great but the heater does not get very hot. It runs right around the N in normal in the heat gauge. The thermostat is brand new and the coolant level is good. What could be causing this? Any help would be much appreciated as winter is here.
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Old 10-27-2009, 21:02   #2 (permalink)
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Re: 94 Aerostar heater issues

Do the heater hoses get hot? If not, you could have a plugged heater core. If so, take the hoses off and run a garden hose to one and see if you can flush it out.
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Old 10-28-2009, 16:21   #3 (permalink)
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Re: 94 Aerostar heater issues

Not to sound dumb, but which hoses exactly am I checking? Not sure which ones to check for this.
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Old 10-28-2009, 16:29   #4 (permalink)
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Re: 94 Aerostar heater issues

Check them both. They should both be hot, one more so than the other.
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Old 10-28-2009, 18:14   #5 (permalink)
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Re: 94 Aerostar heater issues

Ok, will check them tomorrow after the van is running for a while. Too cold to go check them tonight. Thanks for the help. What if they are both hot? Then what is the issue?
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Old 10-28-2009, 19:09   #6 (permalink)
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Re: 94 Aerostar heater issues

If they're both hot, you have a heater flap issue. The heater cores usually get plugged and cause this. If you run the heater and switch the temperature to cold, does it get cold?
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Old 10-29-2009, 05:28   #7 (permalink)
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Re: 94 Aerostar heater issues

Yes, it gets colder than it was.
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Old 10-29-2009, 08:08   #8 (permalink)
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Re: 94 Aerostar heater issues

Then it's probably a coolant flow problem. Check the hoses for temp.
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Old 10-30-2009, 18:02   #9 (permalink)
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Re: 94 Aerostar heater issues

So I check all the hoses and they are all getting hot. I did the test that is listed in my Hayne's manual to squeeze the top radiator hose to see if there is water flowing. I did this and it feels like there is no water flow. Is it possible for the water pump to be bad and the van not overheat?
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Old 10-30-2009, 18:27   #10 (permalink)
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Re: 94 Aerostar heater issues

If you had no flow, the hoses wouldn't get hot and the engine would definitly overheat. Both small heater hoses were hot?
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