Question about Oldsmobile 88
Are you sure that it is not the temp sender that is at fault?
Reason I say this is to my knowledge there are two relays numbered 6 and 7 which are located in a box under the hood. These control a low and high speed output to the fan.
As it seems that you have no activation of the fan at all the temp sender sensor/switch may be at fault. This is usually located in the radiator and on your year Olds 88 looks like this;
First I would advise that you check that the wiring and connections to this sensor are intact.
Second look under the hood for the location of the box containing these relays. Unfortunately Olds kept changing the location of these relays throughout the 90's so I cannot be more specific than that in this instance.
Hope this helps. If so please do rate my answer. Many Thanks.
Posted on Sep 08, 2009
There is a chance that this is a ground problem, but probably not. Check all the big fuses in the power boxes under the hood. Not having a diagram, I am guessing that at least 1 or 2 send power to the other fuse box. The terminals on these fuses get a yellow or tan glaze on them which does not look bad, but if it is there, it may also be on the inside of the fuse sockets. This can suddenly bring an otherwise perfectly running vehicle to a dead stop...and not start. The first time I found it was on a Ford 18 passenger bus. Towed in dead. A fingernail file or womens emery boards will fit into these if trimmed and will effectively clean the insides of the socket. You can also try to fold emery paper, but it is not rigid and may be more difficult. Check the relays and their sockets also. Dielectric gel is a good idea when done, especially in a cold climate. I think it is a power problem of course since you say that nothing is on, but in the event that you can't find a contaminated fuse or relay, here is something else to check. Got this from a mechanic friend who found it on a 1994 Bonneville with a no start condition. We are now looking at grounding problems.On many of the Buicks, Olds's and Pontiacs, many of the wires from the dash and some from the engine compartment come together under the door thresholds...under the trim strip that guards the body and also holds the carpet in place at the doorways. These have lousy connections for bad weather climates, and the connections go bad and things just shut down. These grounds are some of the grounds for the under hood relays. You should really have a book with a wiring diagram. It can save you incredible amounts of time, especially if it is year and model specific.
In our model, the relay would be in passenger side fuse box.
Note - Make sure all the battery connections are tight.
If problem persists, let me know.
Hope i helped you.
Thanks for using ' Fixya ' and have a nice day!!
Posted on Sep 08, 2009
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Posted on Jan 02, 2017
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