99' a/c blows hot
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Joined: Feb 2005
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99' a/c blows hot
This is my first post so bear with me. After getting oil change and new air filter, on the way home the a/c blows hot air in the cold position on all settings. I called the qiuck change and the manager who did the work said it must be coincidental. Huh. Any thoughts I know nothing. Please help.
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Joined: Sep 2002
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I'm assuming that the vehicle in question is an XLT with the three-dial HVAC system.
When you say it blows hot air in all settings, do you mean that it's also occurring in non-A/C settings like "VENT" and "HEAT"?
When you rotate the temperature control dial from the cold to hot positions, no change in air temp? If so, I would wonder about a stuck or otherwise inoperative blend door, which, among other things, regulates the involvement of the heater core in the system. In the good old days, sliding the "Cold"________________"Hot" lever would open and close a valve that fed hot engine coolant into the heater core. In the Expy, hot engine coolant is fed into the heater core 24/7/365. The position of the blend door determines whether or not you fry the polish off your shoes in July.
When you say it blows hot air in all settings, do you mean that it's also occurring in non-A/C settings like "VENT" and "HEAT"?
When you rotate the temperature control dial from the cold to hot positions, no change in air temp? If so, I would wonder about a stuck or otherwise inoperative blend door, which, among other things, regulates the involvement of the heater core in the system. In the good old days, sliding the "Cold"________________"Hot" lever would open and close a valve that fed hot engine coolant into the heater core. In the Expy, hot engine coolant is fed into the heater core 24/7/365. The position of the blend door determines whether or not you fry the polish off your shoes in July.
