A/c works great at 75 degress outside ,above 75 degress will work a short time,then it will blow hot air this is going down the road,i have added 134a to it 1 can,i check fuses ok,check power at a/c relay ok .but when a/c shuts down no power at relay .but when its cool outside the a/c works ok,i was feeling the a/c lines when it works, they are cold when a/c not working they are very hot.....need help in this .
Do the tests in this post
http://ricksfreeautorepairadvice.com/heat-load-test-thermostatic-expansion-valve-system/
Heat load test on thermostatic expansion valve system...
Perform maximum heat load test on...
SOURCE: i have a 2000 dodge caravan, no heat
Sounds like the air "blend" door might be inoperable. This door opens and closes a specified amount to regulate the amount of either cooled or heated air, as requested by the climate control unit. If the door is continually in the position which is bypassing the heater core (cold setting), the air will not get warm regardless of the condition/operation of the heater core. I'd suggest having this component checked.
SOURCE: heater blowing cold air
squeeze the hoses to get any air bubbles out and refill coolant as necesary. are you sure you put thermostat in the right way? may be backwards. also may be your sensor.
SOURCE: Heater doesn't blow hot air
First check the coolant level in the radiator. Check your heater core hoses on the firewall underneath the hood. Let the car come up to temp. and feel the two hoses. If only one of them is getting hot you may have bad heater core or a bad heater control valve.
SOURCE: 1999 Dodge Durango - A/C blows hot air- Compressor is working.
sound like ac vent or air door is not open.your ac mode switch is bad or the ac air door actutator is not getting vacuum .check vacuum lines to ac switch.besure disable air bags when working around steering area or dash.
SOURCE: 2002 Dodge Ram 1500 - The heater blows cold air
the heater blowing cold at an Idle and warm while driving it,is usually low coolant in the radiator,remove the radiator cap when engine is cold,fill to the top,and fill overflow tank to full,if that doesn't take care of it,check the heater hoses at an idle and see if they are both the same temp,it might be a water pump not doing its job.
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