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GM 3.4L OVERHEATING, COOLING FANS NOT WORKING
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HEATHB
New User
Apr 25, 2011, 8:22 AM
Post #1 of 2
(4720 views)
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GM 3.4L OVERHEATING, COOLING FANS NOT WORKING
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2002 BUICK RENDEVOUS, 3.4L, 115,000 MILES Engine over heats, cooling fans not coming on. Fans come on low speed with ac on, will not cycle on at operating temp. coolant temp sensor good, fan 1 relay good, fan 2 relay good, fan speed relay good, and fans good. un plug temp sensor fans come on high speed. No head gasket leak, pressure and chemical tested, thermostat operating properly, no blockage in radiator. stumped on this one, any sugestions?
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 25, 2011, 10:58 AM
Post #2 of 2
(4701 views)
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Re: GM 3.4L OVERHEATING, COOLING FANS NOT WORKING
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There is nothing wrong with your system. You are just expecting them to come on too soon. They aren't programmed to come on that low.
Low speed comes on at 223 and high speed comes on at 230.
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