blower issues, what's next
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Junior Member
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From: CT
blower issues, what's next
2000 f150 Lariat 4.6:
Had the truck about a yr. The heater only worked when the fan was on high. Summer comes along and I charge the AC and it works fine for a few weeks, again with fan on high. After 2-3 wks. the air is no longer cool and shortly afterwards the fan no longer works at all. Searched the forum which led me to change the blower relay and blower resistor, checked the fuses #22 & 5, cleaned all contacts, still no love. What's my next step? Any ideas. Any help would be appreciated. Oh, and no idiot lights are on.
I'm also suddenly having issues with slight surge and ebb while idling. I only mention in case there is a connection, though I doubt it.
Thanks in advance for any advice.
Had the truck about a yr. The heater only worked when the fan was on high. Summer comes along and I charge the AC and it works fine for a few weeks, again with fan on high. After 2-3 wks. the air is no longer cool and shortly afterwards the fan no longer works at all. Searched the forum which led me to change the blower relay and blower resistor, checked the fuses #22 & 5, cleaned all contacts, still no love. What's my next step? Any ideas. Any help would be appreciated. Oh, and no idiot lights are on.
I'm also suddenly having issues with slight surge and ebb while idling. I only mention in case there is a connection, though I doubt it.
Thanks in advance for any advice.
Senior Member
Joined: Oct 2002
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From: St. Louis (Out in the woods)
Probably three separate issues although two are related to the climate control system.
The idle issues are likely due to an IAC issue.
Start with fixing the blower. Use your meter and measure the voltage at both of the blower motor terminals with the ignition switch in RUN and the blower set to high. What is the voltage reading at each terminal?
The idle issues are likely due to an IAC issue.
Start with fixing the blower. Use your meter and measure the voltage at both of the blower motor terminals with the ignition switch in RUN and the blower set to high. What is the voltage reading at each terminal?
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Joined: Jun 2002
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From: Under the flightpath of old ORD 22R
How did you check the fuses, pull and stare at them and reinstall them or use a meter to check for power on both pins on the back of the fuse while installed ?
When you replaced the blower motor resistor, did you replace the pigtail also ?
- Have seen this melted as well.
When you replaced the blower motor resistor, did you replace the pigtail also ?
- Have seen this melted as well.
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Junior Member
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From: CT
How did you check the fuses, pull and stare at them and reinstall them or use a meter to check for power on both pins on the back of the fuse while installed ?Yes, pretty much, but I sprayed both the fuses and fuse block with electrical contact cleaner.
When you replaced the blower motor resistor, did you replace the pigtail also ?
- Have seen this melted as well.
When you replaced the blower motor resistor, did you replace the pigtail also ?
- Have seen this melted as well.
Thread Starter
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Junior Member
Joined: Sep 2012
Posts: 4
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From: CT
Probably three separate issues although two are related to the climate control system.
The idle issues are likely due to an IAC issue.
Start with fixing the blower. Use your meter and measure the voltage at both of the blower motor terminals with the ignition switch in RUN and the blower set to high. What is the voltage reading at each terminal?
The idle issues are likely due to an IAC issue.
Start with fixing the blower. Use your meter and measure the voltage at both of the blower motor terminals with the ignition switch in RUN and the blower set to high. What is the voltage reading at each terminal?
Technical Article Contributor
Joined: Jun 2002
Posts: 10,511
Likes: 10
From: Under the flightpath of old ORD 22R
?Yes, pretty much, but I sprayed both the fuses and fuse block with electrical contact cleaner.
If you mean the female connector, no, just sprayed it with cleaner. They didn't show any obvious damage or melting on them. Truthfully, I'm not super mechanical, I read the forums and most indicated the relay and resistor so I changed them. I don't want to continue changing things *****-nilly so I thought I'd post in case someone has had similiar issues.
If you mean the female connector, no, just sprayed it with cleaner. They didn't show any obvious damage or melting on them. Truthfully, I'm not super mechanical, I read the forums and most indicated the relay and resistor so I changed them. I don't want to continue changing things *****-nilly so I thought I'd post in case someone has had similiar issues.
If so, might want to use that meter you are getting to test the fuse while installed, with the correct key position ( safest to have it in run when testing, so you don't have to guess ).
The connector what is obvious signs of damage ?
Picture from a thread here
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From: CT
Thanks Scully, good info and picture. Yes means stared at it and cleaned the contacts on the fuse and board. No visible signs of damage means just that, no burn marks, no loose or damage wires. I did not remove the whole harness as shown, I'm clearly not as experienced as you are. I had a hard time accessing the resistor and managed mostly by feel and a hand mirror. What some people have described as a 15 min. job took me 1 1/2 hrs.
