2000 Chevrolet Monte Carlo HVAC

ALFONZOROSS

MEMBER
2000 CHEVROLET MONTE CARLO
165,000 MILES

Ac/heat won't turn on unless I hit the dash. Sometimes it works and sometimes it doesn't. Replaced blower motor and resistor and still having same issue. What could it be in the dash that's causing this issue?

Tuesday, November 5th, 2013 AT 5:46 PM

3 Replies

HMAC300

MECHANIC
48,601 POSTS

Check the ground and the actuator for temp control it may be sticking. Ground is behind left side of dash by brake pedal bracket. The actuators are vacuum controlled so it may be loose or the vacuum motor sticks.

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Wednesday, November 6th, 2013 AT 7:08 AM

ALFONZOROSS

MEMBER
2 POSTS

Replaced actuator and it still isn't working properly. It kicks on sometimes when I hit the dash on the passenger side

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Saturday, November 9th, 2013 AT 3:21 PM

HMAC300

MECHANIC
48,601 POSTS

Then you'll have to check for a vacuum leak or a pinched line. If you are hitting it, it has to be jarring something to make it work it cold also be the control head as well. When you say it works does the blower work as soon as you turn it on or after you hit the dash? If it's that where the blower works after you hit the dash then it's either a bad ground for blower, or the module, see pic. You might see if the power comes to it whenyou turn it on then goes out if not maybe you can change a like relay and see if that fixes it.

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