2003 Nissan Altima engine

2003 NISSAN ALTIMA
145,000 MILES • 2.5L • 4 CYL • FWD • AUTOMATIC
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BADBOYMARCUS
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  • 71 POSTS
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..
Sep 22, 2014 at 8:55 AM
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JACOBANDNICKOLAS
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  • 110,248 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?
Sep 22, 2014 at 10:33 AM
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BADBOYMARCUS
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  • 71 POSTS
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..
Sep 22, 2014 at 10:53 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
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.
Sep 22, 2014 at 11:00 AM
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BADBOYMARCUS
  • MEMBER
  • 71 POSTS
Ok Thank You..I will let you know if that's what it was.
Sep 22, 2014 at 11:30 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
I look forward to hearing from you.

Joe
Sep 22, 2014 at 12:23 PM
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