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#1
06-11-2006, 06:11 PM
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High speed mode of Cooling Fan
Hello again!
My 99 Transport 3.4 does not want to run the "high Speed" mode of it's cooling fan. I have hooked up a scan tool - and tried to force the high speed mode of the fan but can only activate the low speed setting. The guage needle is climbing around the 100 mark - should be at the first mark and staying there! If I drive it - the temp comes down... Any thoughts??? Thanks in advance, Shane 
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#2
06-11-2006, 06:37 PM
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Re: High speed mode of Cooling Fan
Hey Shane,
There are three (3) relays involved for the fans, but one is "special" for high speed mode. I have some details about the system at the link below, including a schematic. That should help some. Cooling Fans Take Care,
__________________
Greg A. 2001 Chevy Venture w/some "enhancements" ~ 105K Miles (Dec. 2010) 1992 Jeep Cherokee Laredo, 4.0L, Automatic ~ 155K Miles (Dec 2010)
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#3
06-12-2006, 10:18 AM
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Re: High speed mode of Cooling Fan
Thanks very much! I will work with this and let you know how I make out.
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#4
08-06-2006, 11:58 AM
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Re: High speed mode of Cooling Fan
Thanks for the help. I tested all of the relays and fuses - even checked all wires - still nothing. It appears that the engine also stalls the second the high speed fans try to kick in. There are no codes being tripped - just a stall. Once the engine cools - it will start right up again...
any other thoughts?? I am thinking computer but it is expensive and once you buy it you can't return it.. again - thanks!
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