# No AC blowing, No Heat blowing, hear hiss when turning on AC or heat **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** towncar, lincoln\ **Created:** [October 14, 2016, 4:31pm UTC](https://community.cartalk.com/t/no-ac-blowing-no-heat-blowing-hear-hiss-when-turning-on-ac-or-heat/96096 "2016-10-14T16:31:26Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![JosephButler](https://avatars.discourse-cdn.com/v4/letter/j/f1d935/32.png) [@JosephButler](https://community.cartalk.com/u/JosephButler)\ **Post date:** [October 14, 2016, 4:31pm UTC](https://community.cartalk.com/t/no-ac-blowing-no-heat-blowing-hear-hiss-when-turning-on-ac-or-heat/96096/1 "2016-10-14T16:31:26Z")
I turn my car on. I have no error lights on my dash. The heater and AC control unit lights up. I press the down arrow on my in-dash heater/AC control unit so I can get some cold air. I hear a hissing sound for about 2 seconds, but no air comes through the vents I get the same effect when trying to use the heater. Quick hissing sound, no air through vents. Both stopped pushing air at the same time (when my ac stopped working, I tried to put out heat just to check) I have checked al the fuses under my steering wheel and in the engine compartment using a circuit tester (w/light). There is an AC Clutch relay fuse in the engine fuse box. Not sure if I should check that. What should my next steps be. please be as specific as possible (pictures are always helpful). Thank you. ---
**Author:** ![OldcarsRbest](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/oldcarsrbest/32/4812_2.png) [@OldcarsRbest](https://community.cartalk.com/u/OldcarsRbest)\ **Post date:** [October 14, 2016, 6:00pm UTC](https://community.cartalk.com/t/no-ac-blowing-no-heat-blowing-hear-hiss-when-turning-on-ac-or-heat/96096/2 "2016-10-14T18:00:52Z")
Add what year, engine, mileage when you get a chance; that will help with the diagnosis. If I were to guess, the main thing the heat and A/C have in common is the fan motor. If it is not working, you won’t feel any air blowing. This may also explain the hiss you are hearing-probably vacuum actuated doors to change direction of air flow-you just may never have heard this since it would be drowned out by the noise of the fan motor. ---
**Author:** ![JosephButler](https://avatars.discourse-cdn.com/v4/letter/j/f1d935/32.png) [@JosephButler](https://community.cartalk.com/u/JosephButler)\ **Post date:** [October 14, 2016, 8:31pm UTC](https://community.cartalk.com/t/no-ac-blowing-no-heat-blowing-hear-hiss-when-turning-on-ac-or-heat/96096/3 "2016-10-14T20:31:27Z")
2001, V8, 120k miles ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [October 14, 2016, 8:44pm UTC](https://community.cartalk.com/t/no-ac-blowing-no-heat-blowing-hear-hiss-when-turning-on-ac-or-heat/96096/4 "2016-10-14T20:44:28Z")
The HVAC system in your vehicle is totally electronic. No vacuum motors. And when the HVAC system in your vehicle fails to produce cold/warm air, it’s usually caused by a defective EATC control module. [https://modulemaster.com/rebuilds/shop/comfort/climate-controls/ford-lincoln/](https://modulemaster.com/rebuilds/shop/comfort/climate-controls/ford-lincoln/) Tester ---
**Author:** ![JosephButler](https://avatars.discourse-cdn.com/v4/letter/j/f1d935/32.png) [@JosephButler](https://community.cartalk.com/u/JosephButler)\ **Post date:** [October 14, 2016, 10:45pm UTC](https://community.cartalk.com/t/no-ac-blowing-no-heat-blowing-hear-hiss-when-turning-on-ac-or-heat/96096/5 "2016-10-14T22:45:45Z")
@Tester I will perform the diagnostics listed here and post the results: ---
**Author:** ![JosephButler](https://avatars.discourse-cdn.com/v4/letter/j/f1d935/32.png) [@JosephButler](https://community.cartalk.com/u/JosephButler)\ **Post date:** [December 3, 2016, 12:14am UTC](https://community.cartalk.com/t/no-ac-blowing-no-heat-blowing-hear-hiss-when-turning-on-ac-or-heat/96096/6 "2016-12-03T00:14:30Z")
It was the blower motor/regulator. I took out the fan and hooked it directly to the battery and it worked. I then tested that power was getting to the blower motor from the wires. So I went to AutoZone and purchased a replacement blower motor/regulator and it all worked once it was hooked up. Now my car gets comfortably hot and the AC works, though not as cold as I wanted. ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [December 3, 2016, 12:27am UTC](https://community.cartalk.com/t/no-ac-blowing-no-heat-blowing-hear-hiss-when-turning-on-ac-or-heat/96096/7 "2016-12-03T00:27:50Z")
Thanks for a post back, good to know what worked, and that you got your car’s climate regulated again. Best of luck.