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Are the dashboard fans driven by toothed belt?

 
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Old 29 Mar 2011, 09:37 am
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Default Are the dashboard fans driven by toothed belt?

Are the passenger compartment fans in the P.T. Cruiser driven by toothed belt?

I ask because I'm occasionally getting a noise that sounds like a sprocket rubbing against a non-moving toothed belt. It goes away if I change the fan speed, or rev the motor. It feels like either the belt is slipping or one of the wheels that it's driving is freezing up.

If it is the belt that drives the passenger compartment fans, what else is driven by that belt? If it's just the fans, it's not an urgent fix, but if there's something else driven by that belt that actually matters, it might be.

I'm thinking of the old Ford Escorts, where the water pump was driven by the timing belt. When the water pump seized, as it inevitably would, somewhere short of 100,000 miles, it'd strip or break the belt, and on the old Escorts, that'd result in serious valve damage.

So, I'm wondering if I have an urgent problem, or one that will cause no more than a bit of discomfort.

Help would be appreciated.
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Old 29 Mar 2011, 11:00 am
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Default Re: Are the dashboard fans driven by toothed belt?

What year is your PT. I have factory service manuals for 01 and 06 ... can check when I get home, but I have never heard of an interior automotive fan using a belt, usually it is direct drive, no gears. I have heard if what you are talking about ... usually it is a peice of paper, plastic wrapping, tape or leaves that fall down a vent and get into the squirrel cage fan and make this noise. Since we have cabin filters it is probably not from outside unless that filter has deteriorated. You might find one of these problems if you pull the cabin filter.
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Old 29 Mar 2011, 11:31 am
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Default Re: Are the dashboard fans driven by toothed belt?

Quote:
Originally Posted by SilverSport View Post
What year is your PT. I have factory service manuals for 01 and 06 ... can check when I get home, but I have never heard of an interior automotive fan using a belt, usually it is direct drive, no gears. I have heard if what you are talking about ... usually it is a peice of paper, plastic wrapping, tape or leaves that fall down a vent and get into the squirrel cage fan and make this noise. Since we have cabin filters it is probably not from outside unless that filter has deteriorated. You might find one of these problems if you pull the cabin filter.
Agree - except US Cruisers don't have a filter installed from the factory.
Yes a leaf/part of a leaf can work it's way in and "tickle" the fan blades. I've switched to high speed and have had leaf pieces shoot out vents - you have nothing to worry about.
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Old 30 Mar 2011, 06:20 pm
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Default Re: Are the dashboard fans driven by toothed belt?

+1 on the "junk" in the fan blades, I ordered a cabin filter kit because my PT didn't have one; When I went to install it I found Pine needles, bits of leaves etc down in the fan housing! It was pretty dirty as well. I used a shop vac to clean what I could get to, I plan to remove it when the weather warms up and clean the fan blades properly. The fan works fine, I just don't like the mess in there.
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Old 30 Mar 2011, 10:37 pm
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Default Re: Are the dashboard fans driven by toothed belt?

I bought a replacement filter when buying some other parts .... guess I should look in there and install the first filter, if it is true that they don't come with them. It is a much larger filter than the one my VW uses.

I bought a 75 Vega many many years ago. It had 5 full size Bic cigarette lighters that had fallen down the defrost vents into the area of the heater/evap core. They probably would have ruined the fan if the fell in that area.... they did not make the fans of plastic in those days ... all steel. OR .... The explosion probably would have opened a nice 2 foot hole in the dash.
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Old 06 Apr 2011, 10:38 pm
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Default Re: Are the dashboard fans driven by toothed belt?

I didn't think it was just a leaf in the fan. Once the sound started, it'd stay the same as I changed fan speeds. It'd even continue for a while, after I'd turned the fan off.

The other day, it happened again, just as I was turning the fan to defrost. And then it struck me - it does seem to have been tied to turning to defrost. Which got me thinking. Fans on directed to the foot well or to the dashboard are just fans. Fans on directed to defrost turns on the A/C. So I turned on the A/C, and the same thing happened.

So, I'll rephrase the question.

Is there something that could be generating this sort of grinding sound involved in the A/C?
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Old 06 Apr 2011, 10:47 pm
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Default Re: Are the dashboard fans driven by toothed belt?

Could be a bad bearing or failing drive clutch on the A/C compressor.
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Old 03 Jun 2011, 08:23 pm
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Default Re: Are the dashboard fans driven by toothed belt?

PT have no fans driven by toothed belt. But it also depends on the year. Older versions may have fan blades controlled by toothed belt.

Didn't you checked your fans? may be there are certain problems on the fan blades and not on the gears.
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Old 04 Jun 2011, 07:47 am
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Default Re: Are the dashboard fans driven by toothed belt?

It wasn't the fan, it was the AC. It had appeared when I turned on the defrost.

And it turned out that it was just a bit of the housing that was rubbing.
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