ok here is the deal my fan would run all the time with the engine on and when it would be in accessory mode and like yesterday i noticed my car was getting hotter than usual now i have no fan at all it doesn't even come on. anyone have any ideas what to look for i think the motor might have died. one more thing when my car got really hot like close to red in the temp gauge my volts and tach started to jump and the choke light cam on to. once it cooled down the gauges went back to normal but the choke light still stays on. if you can help with me the fan or the choke i would appericate it. thanx in advace.

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86 Z28:
350 vette
aluminum heads
T-5
235/60R15 BFgoodriches
dual 3"flowmaster exhaust
20% tint
hatch wing
2 12"kicker solos
300 watt Sony xplod amp
Sony xplod deck
K&N air filter

 

Could be # of different things. 1 possibility is the fan motor. You could splice into it and run direct to the battery to test it out. If it comes on, it's something before the fan that's not communicating with it. That could be, Coolant Temp. Sensor, Fan Switch, Fan Relay, or the Fan Fuse. If the fan comes on with A/C, relay is good. I'm not too familiar with the 350 Vette. This is what I've learned from my TBI. I hope this helps out!

C-ya!

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"WARNING: Objects in mirror are about to disappear VERY quickly!"

 

where is the fan fuse? im gonna take a test tonight and see if the fan is getting power if it is i think the fan is just old and the motor gave out.

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86 Z28:
350 vette
aluminum heads
T-5
235/60R15 BFgoodriches
dual 3"flowmaster exhaust
20% tint
hatch wing
2 12"kicker solos
300 watt Sony xplod amp
Sony xplod deck
K&N air filter

 

also where is the fan switch and relay? what does the relay do? thank you in advance

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86 Z28:
350 vette
aluminum heads
T-5
235/60R15 BFgoodriches
dual 3"flowmaster exhaust
20% tint
hatch wing
2 12"kicker solos
300 watt Sony xplod amp
Sony xplod deck
K&N air filter

 

come on guys help me out!!! can u tell me where i can find this stuff?

 

Well, on a stock engine, the fan switch is between plug 6&8, if I'm not mistaken. The fan fuse is located in the fuse block. On my 'Maros, the relay is located on the firewall, driver side. This is what I got from Autozone website:

"UNDER HOOD, DRIVER SIDE, REAR SIDE OF STRUT TOWER, DRIVER SIDE OF BRAKE MASTER CYLINDER, MOUNTED ON UPPER FIREWALL"

You'll know the relay is good, if the fan comes on with the A/C.

This is what I got for the Cooling Fan Switch:
UNDER HOOD, DRIVER SIDE, LOWER ENGINE AREA, BELOW EXHAUST MANIFOLD, MOUNTED IN ENGINE BLOCK.

I hope this helps you out some. Later....



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"WARNING: Objects in mirror are about to disappear VERY quickly!"

 

thanx for the help!!! what would the fuse be labled as for the fan in the fuse block just fan? and how many amps is it?

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86 Z28:
350 vette
aluminum heads
T-5
235/60R15 BFgoodriches
dual 3"flowmaster exhaust
20% tint
hatch wing
2 12"kicker solos
300 watt Sony xplod amp
Sony xplod deck
K&N air filter

 

Man, I can't remembe off the top of my head. You'll have to wait till I get off work around 5. I'll let u know this evening unless I remember before. But I think it says just FAN. Not sure. Later....

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"WARNING: Objects in mirror are about to disappear VERY quickly!"

 

i looked but i don't think mine says fan i have an 86 Z28. could you please let me know when u get a chance. i don't think my fan is getting power and that could be it. also do all fans have a fuse? my fan motor just might have burned out.
thanx for the help!!!!

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86 Z28:
350 vette
aluminum heads
T-5
235/60R15 BFgoodriches
dual 3"flowmaster exhaust
20% tint
hatch wing
2 12"kicker solos
300 watt Sony xplod amp
Sony xplod deck
K&N air filter

 

Remember that the purpose of the fan fuse (labled as "fan" and rated at 20 amperes) is only to protect the +12 used to turn on the relay coil, not to power the fans directly.

The purpose of the fan relay(s) (one relay per fan - some had one fan/relay, others two fans/relays) is to switch the higher current that the fans demand (typically ~15 amperes each for a run condition). The relay coil receives +12 when the ignition is "on", so the fans will be off with ignition "off". The relays switch +12 direclty from the battery through a fusible link. (If you have two fans/relays, only one wire/fusible link will be used to the battery. If the fusible link opened, the fans will not operate even though you see a good 20 ampere fan fuse in the fuse box.

Easiest way to see if the fan motors work is to simply remove the fan relay from its socket and connect the two largest wires (e.g. with a needle nose pliers, paper clip, etc.) on the relay socket together. This will apply +12 to the fan motor(s). Doing this manually does the same thing the relay does. The fan motor(s) are grounded permanently in the wiring harness.

If the fans do not operate when doing this test, check for +12 at one of the thick wires on the fan relay(s) (engine can be off since this wire is connnected directly [continuously] to the battery via a fusible link). If you don't see +12 on one of those wires, then the fusible link may have opened, necessating replacment this wire. To test, get a length of wire and connect one side to the battery positive terminal and the other side to one of the thick wires on the relay socket to turn the fan "on". Don't know which thick wire to connect on the fan relay socket to the battery? It doesn't matter since one of the thick wires (orange for me) will be connected to the battery (with the fusible link possibly "open") and the other goes to the fan motor positive (black/red and black/pink for me).

[This message has been edited by Stuart Moss (edited May 23, 2001).]

 

thanx for the help!!! im gonna try this stuff out. all i know is that the fan is getting power cause i tested the wire with a test light and it lit up. i think the fast was just old and it is the motor but it could also be the relay. BTW how does much does a relay go for?
thanks for the help!!!!

------------------
86 Z28:
350 vette
aluminum heads
T-5
235/60R15 BFgoodriches
dual 3"flowmaster exhaust
20% tint
hatch wing
2 12"kicker solos
300 watt Sony xplod amp
Sony xplod deck
K&N air filter

 

if you have power at the fan motor it means the fuse and relay are both good. it could be the motor or the switch. disconnect the fan switch wire (between plugs 6&8) and ground the wire. if the fan comes on you have a bad switch, if not you have a bad motor.

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85 IROC 350 11:1keith blacks,.555lift erson roller cam,1.5 crane roller rockers,edelbrock intake,holley 4150 750dbl pumper, nitrous oxide,full length heddman headers,true dual exhaust, 11"stall converter, 700R4, 3.73 locker

 

Shouldn't cost you more than 15 georgies. I got mine @ Autozone for 9 bucks and some change. This is the O.E.M. # that AZ's website gave me: #14089936 Hope we could help ya out! Later...


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"WARNING: Objects in mirror are about to disappear VERY quickly!"

 

what does the fan switch do.i do have power and like i said my fan is rigged to come on when the car is started no matter what the temperature is. what does the switch look like? ill check it out. this weekend i think im gonna get a new fan. what side of the block would the switch be on if im facing the car?
thanks for the help!!!

 

From the factory, the coolant fan switch is located between the 6 and 8 cylinders on the block (you'll have to get underneath to see it) just forward and above the starter - not to be confused with the knock sensor that also is connected with one wire and is located forward of the coolant fan switch.

I got one from Summit (I think the make was Haynes) that turns "on" at 200°F and "off" at 185°F. It was ~$38 a couple years ago.

The stock GM sensor switch the Camaro turns "on" way too high in my opinion (for my '91 Camaro, the ECM turns "on" at 222°F, and the stock coolant sensor switch is even worse - 238°F!).

I would suggest that you get a 170-180° thermostat to replace the factory 195° thermostat to gain the all the benefits of the lower switch settings.

Do a search for "thermostat" to see the many, many posts citing the pros and cons for the different temperature ranges (160, 170, 180 and to a much lesser extent 195).