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Engine shudder with ac and heater

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Old 29 May 2012, 07:37 pm
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Join Date: May 2012
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Question Engine shudder with ac and heater

My 2003 cruiser engine has developed a very noticeable shudder when I turn on the ac or the heater. It is much more noticeable with the ac though. Any thoughts on where to start troubleshooting it? Runs good otherwise, just when I switch one or the other on. And thanks!
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Old 29 May 2012, 07:44 pm
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Join Date: Jul 2011
Location: Detroit, MI
Posts: 106
Default Re: Engine shudder with ac and heater

I'm not sure why it would shudder when the heater is on, but if it shudders when the A/C is on, it is more than likely the radiator fan. Turn the A/C on, and check the radiator fan to see if it comes on. If not, then it's time for a new fan, or to try to fix the fan. There are numerous posts on this forum for you to check out related to this issue.
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Old 29 May 2012, 09:56 pm
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Join Date: May 2010
Posts: 1,313
Default Re: Engine shudder with ac and heater

Do you mean your A/C and "defrost" (in heater mode)? If that's the case, it sounds like your fan is shot--if this 'Shudder" occurs at idle, only. Your A/C vents will also blow warm at idle, but will blow cool again when you resume speed.

Our radiator fans also cool the "high side" of our A/C systems, via the A/C condenser. No fan cooling--or too little--and the pressure builds up, putting too much strain on the engine at idle. Thus, the "shudder".

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