740 Blower Motor Question - weak output.

  • Thread starter Thread starter Jamie
  • Start date Start date
J

Jamie

My blower motor doesn't seem to make a horrible noise, but because I am
new to this car I have nothing to compare it to. My best description is
to say it "purrs".

That being said, it does not seem like it is blowing as hard as it
should. When I turn on the defrost, I feel a decent amount of air come
through the defrost vents.

But, the normal vents seem a little weak. I would say that level 4
(high), seems like a 2-3. I checked the squirrel cage and it looked
clean. So, I am thinking either a door is not opening or closing all
the way to channel the air to the vents, or something may be clogged,
thinking the old (input = output) logic. If enough air isn't coming in,
enough won't blow out.

Any thoughts?
 
Depending on the year of your 740, maybe the heater motor is just wearing
out. If the bearings are getting worn (or rusty), this can reduce the
speed, putting more strain on the motor. I had the problem, around this
time of the year when water found its way to the motor shaft, then froze
solid overnight, blowing the fuse #16 on my 1985 740 GLE.

Regardless, here the procedure I wrote back then to check the motor and
replace it if necessary with an inexpensive Delco motor.

http://cvolvo.com/Central/Repair/740.html

Good luck, or as we say in this part of Canada - bonne chance.
 
Thanks, I read that article and it's really great. I think to be sure
I'll just swap the motor when I feel like being "plastic man" again.
Tough location.
 
Jamie: You have obviously not had the pleasure of replacing a 200 or 140
series heater motor - a 5+ hour job. So, the 740 is a walk in the park
compared to earlier designs, although the PV series is the easiest.

Good luck
 
Hi RL:
You are correct, after later reading the cost and labor involved, the
740 seems MUCH better than the 200 series.

Regards,
Jamie
 
Have you checked the resistors which control the fan speed?
It is a quick check they may need replacing.

Zyggy
Jamie said:
My blower motor doesn't seem to make a horrible noise, but because I am
new to this car I have nothing to compare it to. My best description is
to say it "purrs".

That being said, it does not seem like it is blowing as hard as it
should. When I turn on the defrost, I feel a decent amount of air come
through the defrost vents.

But, the normal vents seem a little weak. I would say that level 4
(high), seems like a 2-3. I checked the squirrel cage and it looked
clean. So, I am thinking either a door is not opening or closing all
the way to channel the air to the vents, or something may be clogged,
thinking the old (input = output) logic. If enough air isn't coming in,
enough won't blow out.

Any thoughts?
Click to expand...


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No I haven't. Thanks for the idea. I'll check those out and most
probably see if the local parts shop has the $20 motor in stock. If so,
I'll just replace it.

The previous owner said an AC hose had a hole in it. I saw a rub on the
hose from Drier to Compressor. In the next couple months I need to get
the AC checked out for summer, so this will be an upgrade in itself.

This is one hell of a project.

--Engine overhaul in progress
--Interior cleaned and dash restored
--Window tint removed and windows cleaned
--Tires to be replaced
--360 degree suspension/bushing replacement
--Hood, roof, trunk to be painted
--Radio/speakers to be replaced
--Engine wiring harness replaced
--Wheel center hubcaps replaced (faded Volvo log)
--Fuel relay part replacement ordered
--Windshield replaced
--Headliner replaced
--Missing headlight grill replaced
.....and more!

Ayyyyeee!!!!
 
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