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2003 Nissan Altima engine

Tiny
BADBOYMARCUS
  • MEMBER
  • 2003 NISSAN ALTIMA
  • 2.5L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 145,000 MILES
Car shakes or virbrates when at the light or stop sign. But only does it when ac or heater is on.I Replaced the top motor mount. What do you think it is.
Monday, September 22nd, 2014 AT 3:55 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,117 POSTS
The AC places a load on the engine, but the heater doesn't. However, the defroster will. Are you sure it is when the heater is on? Are the RPM's dropping lower than they should? Are you sure the vibration isn't from the fan motor?
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Monday, September 22nd, 2014 AT 5:33 PM
Tiny
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Yea when you turn the defroster on it does. RPM are not dropping theres no vibration on fan motor or what fan motor you talking about. The fan motor that cools the radiatior. Its got two motors and one of them the bearing is going out I guess make a noise when they turn on.
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Monday, September 22nd, 2014 AT 5:53 PM
Tiny
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  • MECHANIC
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One of the radiator cooling fans will come on with the AC. If it has a bad bearing, that may be what you are feeling.
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Monday, September 22nd, 2014 AT 6:00 PM
Tiny
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Ok Thank You.I will let you know if that's what it was.
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Monday, September 22nd, 2014 AT 6:30 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,117 POSTS
I look forward to hearing from you.

Joe
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Monday, September 22nd, 2014 AT 7:23 PM

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