Heating, Air Conditioning & Cooling SystemsDoes your heater blow cold air? Does your air conditioning blow hot air? Post your all of your technical issues related to your heating, heating core, air conditioning unit and controls here. Don't wait until it is to late to get these important vehicle functions fixed.
Its pretty cool that you have that tool to use in your troubleshooting.
You didin't give us enough information for us to be able to help very much.
How about I give you some info and see if you can figure out what is going on?
Your thermostat should allow the engine to heat up to about 185 before it passes water to the top hose of the radiator, so what temp should the top hose of the radiator be when the engine is hot?
The coolent becomes cooler as it travels through the radiator, therefore..
The lower hose should be cooler, the cooling fans should come on as needed.
The temp of the heater core hoses should be near the temp of the top hose to the radiator.
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BroncoJoe19
2006 Alt Fuel Jeep (electric)
'98 windstar 3.8L
'99 Crown Vic 4.6L
'90 Full Size Bronco 5.0L
I'm not a professional mechanic, take my suggestions with a grain of salt, or a cup of coffee
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Thanks for your reply. New, so my apologies for not giving more info. Neither of the hoses were higher than 140. I would think if the engine passes water to the radiator at 185 the hose should at leat mirror that temperature if not a little less but not 40 degrees less. Also, the top hose to the core was about the same temperature which even to the touch was not hot compared to cars who's heat was working. Even once the car is running it doesn't get hot enough that removing the cap from the radiator appears to be a threat. What are the chances of me buying a bad thermostat from Auto Zone?? Don't want to continue to do the same thing expecting a different result but it was his best recommendation other than replacing the water pump.
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