i got VERY LITTLE heat coming out of the vents.I also have an intermittent wiper issue?

1998 FORD F-150
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SPCTCL
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  • 2 POSTS
One day last week, on my way to work I had no heat, i could hear the damper moving from pos. to pos. But no blower. Left work to go get lunch and it worked, all speeds.
Tonight it happened to me on the way home, no heat blower.. if i put it up on the panel, i got VERY LITTLE heat coming out of the vents.

I also have an intermittent wiper issue.. It seems that when the truck gets wet, the wipers won't work, you can hear the motor trying to do something... but nothing's happening. Then, 5 miles down the road, bingo they work!

Short of having a possessed truck, I can't afford these problems! I'm on a volunteer fire dept/rescue squad that runs over 1000 calls a year! Whether it be from having no defrost to help me see a little clearer or no wipers, I can't go ANYWHERE! HELP!
Jan 10, 2006 at 11:24 AM

What to check next

Diagnostic guidance. Suggested checks and possible repairs are separate from the owner's reported results.

Have power, ground and control signals checked during each failure. Avoid driving when failed wipers or defrost prevent clear visibility.

Guidance references and applicability

Source: This question and its visible discussion, including any clearly labeled editorial corrections. Owner reports are distinguished from other participants' experiences. Follow-up guidance is not a confirmed diagnosis. Fluke: Diagnosing voltage drops https://www.fluke.com/en/learn/blog/automotive/electrical-automotive-troubleshooting General support for testing loaded electrical circuits. Use the actual vehicle wiring and specifications.

Read the replies · Discussion summary and reported outcome

AI-ASSISTED GUIDANCE · REVIEWED BY 2CARPROS
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2CARPRO JACK
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  • 11,533 POSTS
sounds like the blower motor has a bad spot. Also sounds like you need the Wiper Control Module, its a common problem with GMs
Jan 11, 2006 at 7:33 AM
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HOTWHEELSGMC
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blower motor for sure it's located under the dash on the passangers side. and replace the wiper module or it could be the motor or connection
Jan 16, 2006 at 9:18 AM
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BOB77
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2CarPros editorial correction - October 12, 2026

The earlier suggestion to weld a wiper component has been withdrawn. The exact vehicle and failed component were not established. Have the intermittent wiper and blower faults diagnosed at their electrical supplies, grounds, controls and motors before replacing or repairing parts. Do not drive in conditions requiring wipers or defrost when they cannot maintain clear visibility. Any recall applicability must be checked for the actual vehicle; it is not confirmed by this reply.
Jan 16, 2006 at 11:41 AM
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Discussion summary

i got VERY LITTLE heat coming out of the vents.I also have an intermittent wiper issue?

The owner reported an intermittent blower failure and wipers that sometimes stopped working when the truck was wet. Replies suggested motors and a wiper-control module without test findings.

Reported outcome: No successful repair was reported.

The exact failed components and suggested locations were not established. The welding suggestion was withdrawn, and recall applicability was not confirmed.

Read the original discussion

AI-ASSISTED SUMMARY · REVIEWED BY 2CARPROS
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