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Overheating/Fog lamps won't turn on

Nick90vetteguy

Well-known member
Joined
Jun 14, 2010
Messages
188
Location
New Jersey
Corvette
1990 Polo Green Corvette
Ok so for the past month or so my vette has been overheating, I noticed my fans dont kick on at all, possibly a new radiator fan switch? I heard it may be improper ohms in the fuel injectors :confused I installed a new thermostat over the summer, I'm stumped. And is it possible to fry the wiring on the fog lights with anti freeze? :Wbecause I accidently spilled some filling my resivour by the lamps(by the bumper) maybe new bulbs? Thanks guys
 
my vette has been overheating, I noticed my fans dont kick on at all, possibly a new radiator fan switch?
No switch ; fans are controlled by the computer.
Check fan relays 1st
 
Fan relays are on side of radiator by drv side headlight
Does a fan run when you turn the A/c on ?
It should


oh those two black things that look like little film cartridges right? Ya know honestly I cant remember I will definitly check that out tommorow, can those be replaced? And whats the worst case seniero I'm looking at if thats not it? :ugh
 
SOrry to be a pain but your really helpin me lol the relay switches, is their a aftermarket company that has a lower temp. setting?
 
The ECM turn on the fans by completing the ground to the relays. Think it is a green wire. You can test if the fans and relays work by grounding those wires. If you don't have a 90 service manual I could look it up for you. I actually connected a double pole double throw switch from my fan relays to ground so I can turn them on in traffic.

Glenn
 
is their a aftermarket company that has a lower temp. setting?
There are plenty of aftermarket coolant fan switches out there that will turn the fans on automatically at a different temp ( over ride the computer )

But they still use the same relays and wiring you have now so that needs to be working correctly
Pull a relay out , put a jumper between the 2 thick wires in the relay connector ; fan should run.
If it doesn't you have a problem with the fan itself
 
I heard it may be improper ohms in the fuel injectors :confused
Did the person who said this have by chance a set of injectors to sell to you?


Here's your relay schematics (never mind my notes - that was for other diags). Do you have a multimeter?

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(file too big - Cus10041.jpg; attached)
Put 12V on Lt blue wire, ckt 409 second pic, attached HPIM0548.jpg


attachment.php


Primary fan should begin spinning. Do the same then with the other relay connector - ckt 532 (looks like the color says black, but the GROUND wire is black - each one, so that won't be hard to figure out).

Each fan should come on when you do this.

This is a test of the FANS, NOT the relays...

Post back results - then we'll start the relay test procedure.
 

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Thanks for the pic! before I disconnect the relay fans, shoould I check the fuse? I just thought of that! saw it on ur pic:eyerole
 
What is your coolant level? Also, when you replaced the thermostat did you add any coolant?
 
I guess the schematics and pictures are a little hard to understand, so I'll try again here... (you DID say your fans are not coming on, right, post #1?).

Besides the fuses, there's no reason to do or look ANYWHERE else - gauges (once you saw 260), or weatherstripping, spare tire, proCharger, air freshener - ANYwhere - except at the fans. This test will take 3 minutes, if you take your time.

1) Disconnect the 2 connectors that go into the 2 relays in the side of the radiator housing. See the second picture that I posted.

Notice the colors of the wires in the 2 connectors - they match the color description of the wires in the schematic. This tells me that the forward connector is for the PRIMARY fan relay. Do you see this?

In the schematic, there's 2 wires in each opposite end of each fan relay - that could be confusing too - I understand, but the drawing is to simplify the circuits' drawings, NOT the actual connector.

2) Now you're going to jump the fan wires. Get some pliers, and a paper clip, and fold the paper clip in half. Use the pliers to touch the paper clip ends in the relay connector socket, of the red and the light blue wires. Just do it for a moment, to make the fan start spinning.

It will spark, and you don't have to hold the paper clip to the wires very long. Make sure to use pliers, because if you use your fingers, the glowing paperclip/light bulb filament will stick to your fingers like Napalm. :mad

Do you understand what we're doing right here? Do you see this in the diagram? If no questions, let's break here, and do the test... (if you're wanting to know about the fans, that is)
 

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