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Previous Thread Next Thread Print Thread Rate Thread fan not blowing until engine has a load #1079444 11/08/15 12:01 AM Joined: Sep 2004 Posts: 270 SoCal xrtim OP Mudrunner Having an issue with my '98 Trooper. The heater/ac fan won't blow out any of the vents until I put a load on the engine. The fan itself is fine because it does blow once I get some revs and a load going but at idle there's nothing coming out the vents no matter the setting, i.e. recirc, defrost, top or bottom. Seems like a vacuum issue but I can't locate a vac line going through the firewall. Thanks in advance for a great forum. Re: fan not blowing until engine has a load [Re: xrtim] #1079446 11/08/15 05:08 AM Joined: Feb 2000 Posts: 6,247 Bel Buckle, TN 4x4Wire Trail Leader I would go back and check the fan. 12 volts should get the fan running. And engine under load will generate more than 12 volts.... John Stewart Editor - 4x4Wire.com Editor - 4x4Voice Editor - MUIRNet-News President - BlueRibbon Coalition Re: fan not blowing until engine has a load [Re: 4x4Wire] #1079449 11/08/15 06:32 PM Joined: Sep 2004 Posts: 270 SoCal xrtim OP Mudrunner The fan is running, the air is being diverted by whatever mechanism controls where it blows from, i.e. defrost vents, upper vents, lower, etc. its like it just isn't coming out where I want it to. Re: fan not blowing until engine has a load [Re: xrtim] #1079450 11/08/15 08:20 PM Joined: Feb 2000 Posts: 6,247 Bel Buckle, TN 4x4Wire Trail Leader Thanks for the clarification. It does sound more like a vacuum leak. Typical vacuum systems have a flapper that diverts air flow. About all I can say is start tracing vacuum lines... John Stewart Editor - 4x4Wire.com Editor - 4x4Voice Editor - MUIRNet-News President - BlueRibbon Coalition Re: fan not blowing until engine has a load [Re: 4x4Wire] #1079577 11/13/15 01:53 AM Joined: Sep 2004 Posts: 270 SoCal xrtim OP Mudrunner Thanks, verifies what I was thinking. I was just hoping for a little direction on where it vac line is/comes from/goes to. I'll just have to get in there with a good light and look until I find it. Has to be there and there really aren't very many vac lines on this truck. Not like my '81 Toyota...ugh! That was a nightmare. Moderated by  4x4Wire, houlster, jezeric, Jim_Paget, strawmyers  Hop To Mitsubishi Forums ------  Mitsubishi 4x4 and SUV Tech  Mitsubishi Diesels  Mitsubishi ArchiveToyota Forums ------  Early Toyota Trucks  Toyota 4Runner, FJ Cruiser &...  T100 & Tundra Forum  Tacoma Forum  Toyota Tech ArchiveJeep Forums ------  Jeep Talk  Jeep TechIsuzu Forums ------  Isuzu 4x4 & SUV Talk  Isuzu 4x4 & SUV Tech  Isuzu DieselsKia Forums ------  Kia Talk  Kia Sportage & Sorento TechOff Topic Chat ------  4x4 Gallery  Off-Topic Chat  Recreational Access & Land ...  Politics4xForums ------  Outdoor Gear  General 4x4 Discussion  Tools and Fabrication  General Communications  Amateur Radio  GPS and MapsParts Bin ------  Private Party - Garage Sale  Private Party - Items wanted  Vendors, Hot Deals, Group Buys4x4Wire Back Yard ------  Suzuki Forum  AZ Crawler Crew  Cal-Nev Crew  General Ford 4x4 & SUV Forum  General Dodge 4x4 & SUV Forum  General Chevy 4x4 & SUV ForumFeedback & Testing ------  Problems, Questions, Suggestions4x4Wire Staff ------  Forum Moderators  Problem Threads Print Thread Switch to Threaded Mode 5 Excellent 4 Good 3 Average 2 Bad 1 Terrible View Profile Private Message Follow User Forum Posts View Profile Private Message Homepage Follow User Forum Posts View Profile Private Message Follow User Forum Posts View Profile Private Message Homepage Follow User Forum Posts View Profile Private Message Follow User Forum Posts

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