My heater will work then stop then work again, what's wrong?

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papergirl79
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My heater will work then stop then work again, what's wrong?

Post by papergirl79 » Sat Dec 18, 2010 8:39 pm

Hi, I have a 97 GMC Safari AWD and Im having a problem with my heater. It will work just fine and then suddenly just stop working and no air will blow from any vent then out of no where the heater will just start working again :cry: . Any clue what could be wrong? I work nights as a newspaper carrier and use my van to deliver the newspapers, so it is esenital that my heater work.

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mdmead
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Re: My heater will work then stop then work again, what's wr

Post by mdmead » Sat Dec 18, 2010 8:53 pm

Is the fan not working during these times? If so, I'm assuming it isn't working on any of the speed settings. If this is the case, it could be a fan motor going out or a loose wire somewhere.
Matt
Selah, WA
-96 GMC Safari AWD Hi-Top Conversion -->Stalled 5.3L swap & 5" lift
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Kabey's Van
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Re: My heater will work then stop then work again, what's wr

Post by Kabey's Van » Sun Dec 19, 2010 12:34 am

Unplug the wire that goes to the back of the blower motor itself. Clean up this one wire connection and plug it back in.

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Re: My heater will work then stop then work again, what's wr

Post by LiftedAWDAstro » Sun Dec 19, 2010 12:42 am

If you open the hood, you will find the blower on the passenger side behind the washer fluid bottle. I had one in my old 98 that would die. I found the motor connection to be bad. A new blower fixed it up.
Current rides:
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition

Mileage spreadsheet

Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy

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Re: My heater will work then stop then work again, what's wr

Post by Smiliesafari » Sun Dec 19, 2010 4:19 am

Welcome to the site PG. \:D/ Good advise on the blower motor connection. If the blower is working but you are not getting any warm air you might have a vaccuum line gone bad.
1996 Safari SLX Hotair balloon transport vehicle

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Re: My heater will work then stop then work again, what's wr

Post by Red sled » Sun Dec 30, 2012 4:27 pm

A late reply. I'm new to the site and have learned a lot by reading old posts, so I will add to this in the hope that it might help someone.

When my heater fan in my 1999 Astro would stop working and then sometimes work, it turned out to be that the hamster cage fan had slipped on the heater motor shaft and would hit the housing.

I re positioned the fan on the blower motor shaft, no problem after that.
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CaptSquid
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Re: My heater will work then stop then work again, what's wr

Post by CaptSquid » Thu Sep 12, 2013 9:58 pm

Hamster Cage Fan???? :muhaha: :muhaha: :muhaha:
Mike, Billings, MT, 'MERICA!
92 Safari SLE w/Z Motor (sold to a good home)
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93 Suburban Silverado 4x4

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