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My mom has your same vehicle and hers is doing the same thing. I am going to pick up a cheap pair of needle nose vise grip pliers from Harbor Freight and clamp them on the heater hose. The heater control valve is allowing heated coolant to enter the heater core, so it acts like the heater and the A/C are on together, at the same time. This will save the expense of having the heater control valve replaced. Then in the fall when you need heat again, just remove the pliers.
You can see the two heater hoses going into the firewall just behind the engine. You can clamp the pliers on either hose to stop the hot coolant from entering the heater core and heating up the air. Hope this helps. Have a nice week :O)
Sounds like your heater core is clogged. Would you like instructions for replacing it? It requires removal of the steering column and dash. Alternatively, you can try to back-flush the heater core by removing the hoses at the firewall and hooking a garden hose up to the lower port with splice and some clamps. Let me know if you have any questions or would like the instructions.
If the coolant level (antifreeze) level is low there may not be enough fluid in the system for the temperature sensor to register a proper reading ( think of it as holding an oral thermometer just outside of your mouth).
Insufficient fluid passing through the heater core (small fan that blows through a small heated radiator) may not be enough to produce heat.
However: At increased speeds the engine may be heating what little fluid there is to a point to supply heat to the heater core, and register on the temperature sensor.
if running dexcool coolant...may be clogged...dexcool muds up after a while and will clog heatercore and possibly radiator...run some flush product through and replace coolant...not always possible to completely flush out heater core without pulling heater core lines loose and flushing them directly
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