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| heater lower rpm | |
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| Tweet Topic Started: Mar 17 2013, 01:05 PM (624 Views) | |
| brohamjeff | Mar 17 2013, 01:05 PM Post #1 |
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Was noticing that my thermostat was taking a long time to get to full operating temperature. I turned on the heater to see if there was any heat blowing through, which there was, and also noticed the rpms dropped when I turned on the heater full blast. Is that normal? |
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| Stiffchezze | Mar 17 2013, 01:30 PM Post #2 |
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Sir Metrologist
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No, that is not normal. Your heater should not affect RPM's at all. If it does, it means your blower motor is drawing ALOT of amps. Too many in-fact and putting a load on your alternator. I would start with checking you blower motor. Pull it out and check to make sure it turns freely.
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| brohamjeff | Mar 17 2013, 03:33 PM Post #3 |
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Okay. sounds good. Where is the blower motor located? And what is the best way to take it apart? |
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| Stiffchezze | Mar 17 2013, 03:39 PM Post #4 |
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Sir Metrologist
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Under the dash on the passenger side. Held in place by 3 or 4 (can't remember) 10mm nuts. One adjuster cable. I think you have to go in through the back of the glove compartment on your '93 for two of them. It is not that hard. Once you pull one, you can pull another in less than 5 min.
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| RONNIEREDLINE | Mar 17 2013, 03:44 PM Post #5 |
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METRO MAD MAN
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thanks stiffchezze ive got my dash out and didnt think of checking it, im goin out right now to check mine. mine doesnt pull the idle down, but a little lube goes a long way in prevetive maint |
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| brohamjeff | Mar 17 2013, 07:20 PM Post #6 |
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Thank you so much for your help. I'll check this and see what I find |
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| JellyBeanDriver | Mar 17 2013, 07:35 PM Post #7 |
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It's normal. The blower does pull a lot of amps on high and will pull more of a load from your engine from the alternator. |
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| Stiffchezze | Mar 17 2013, 08:43 PM Post #8 |
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Sir Metrologist
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Ok, Ok it is normal for the blower to pull a good bit of amps at high speed. BUT, it should not be majorly noticeable. Guess I should have asked how much it changed the RPM's Still, I would check the fan to make sure it turns easily if it is changing the RPM's enough to notice.
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| Bill CNC | Mar 18 2013, 11:41 AM Post #9 |
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Yes, It is normal for the RPM's to jump when the fan is turned on. EVERY vehicle I have ever had, and that is a LONG list, ... has done this. Not as noticeable as when the radiator fan comes on, but it does jump. |
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| Woodie | Mar 19 2013, 05:07 AM Post #10 |
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Heater fan pulls so much that it's on the list of things which trigger the Idle Up circuit. If your idle drops, then your IAC valve isn't working right. If it were working right you'd perceive a slight change in idle but the IAC would compensate. |
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