High speed fan not working!!!!!

nmcgrawj · Jul 31, 2005

I got the motor running but i got another problem...i dont think my high speed fan is working. I have a switch for it that doesnt turn it on and it does not turn on with max a/c. So i ran a direct line from the ground and to the ccrm and i heard it "click" but no fan. So....does that mean the relay is done or the high speed fan circuit is done?

Can i hardwire the fan to come on?

I will be making another thread but figured i would post here is real quick.

Grn92LX · Jul 31, 2005

I'm guessing bad coolent temp sensor. Did you try running a jumper wire from the fan to the battery?

V8302stangs · Jul 31, 2005

How can you test the ECT sensor it'self to see if it's working properly? I think mine may be bad but I'd like to make sure the problem isn't somewhere else down the line. Also, the AC doesn't make the fan turn on so could that rull out the ECT as the problem? I know the fan it'self works because I ran a wire from the battery to the fan and the fan ran fine.

nmcgrawj · Jul 31, 2005

nmcgrawj said:
I got the motor running but i got another problem...i dont think my high speed fan is working. I have a switch for it that doesnt turn it on and it does not turn on with max a/c. So i ran a direct line from the ground and to the ccrm and i heard it "click" but no fan. So....does that mean the relay is done or the high speed fan circuit is done?

Can i hardwire the fan to come on?

I will be making another thread but figured i would post here is real quick.

I did hard wire to the ccrm but not to the fan....how do i do that?

HISSIN50 · Aug 1, 2005

Nate, it sounds like the CCRM relay for high speed fried. I cant remember if there is a fan fuse or relay in the underhood fuse panel (I think there is - give it a quick look).

Also, for fun unplug the fan connector (with your switch on) and see if you have power at the high speed power wire to the fan itself (in case the fan motor for high speed took a dump). alternatively, run a jumper wire to the high speed fan connector (on the fan) as a bench test to ensure that the high speed does still work.

If that is all that went bad, I might get a variable controller (a la Mr Baskin) instead.

Or take a look at the top diagram here . The top schematic appears to retain input from the ECT as a means to turn the fan on (so basically you are circumventing the CCRM fan relays and using your own).

Good luck Nate.

Dale Royster · Aug 1, 2005

HISSIN50 said:
Nate, it sounds like the CCRM relay for high speed fried. I cant remember if there is a fan fuse or relay in the underhood fuse panel (I think there is - give it a quick look).

Also, for fun unplug the fan connector (with your switch on) and see if you have power at the high speed power wire to the fan itself (in case the fan motor for high speed took a dump). alternatively, run a jumper wire to the high speed fan connector (on the fan) as a bench test to ensure that the high speed does still work.

If that is all that went bad, I might get a variable controller (a la Mr Baskin) instead.

Or take a look at the top diagram here . The top schematic appears to retain input from the ECT as a means to turn the fan on (so basically you are circumventing the CCRM fan relays and using your own).

Good luck Nate.

Thanks for the help man. I am getting power at the end of the connector for the fan but the fan will not kick on. When i reconnected it the fan moved a tad and stopped like the motor isnt strong enough to keep going or is just dead. I guess that is my problem now.

nmcgrawj · Aug 1, 2005

whoops im on my buddies computer that was me in the post

HISSIN50 · Aug 1, 2005

Ok Mr. Smith (or Dale, or Nate or whichever alias you are using).

If the motor tries to spin, or loads or hums, it sounds like High speed took a poo poo. This situation would likely trip the recall CB if you have one. If not be careful for fire hazards.

Any buds around with a spare SN fan to try? That would be the easy way to know. Or if you have an inductive ammeter, you can see what kind of draw is going on with high speed.

Other than that, I have no great ideas. Good luck bud and bump.

V8302stangs · Aug 1, 2005

If I wire up my fan to have a constant low speed fan on (12v + to the 14th pin) without a switch, will that cause any damage to the fan over the long term? Also, would it negatively affect my engine performance if the fan is on at unneccessary times? And one other thing, if I run a fused 12v+ from the battery to the 14th pin, is it possible that that could cause any damage or problems compared to running it from the ignition on?

HISSIN50 · Aug 1, 2005

V8302stangs said:
If I wire up my fan to have a constant low speed fan on (12v + to the 14th pin) without a switch, will that cause any damage to the fan over the long term? Also, would it negatively affect my engine performance if the fan is on at unneccessary times? And one other thing, if I run a fused 12v+ from the battery to the 14th pin, is it possible that that could cause any damage or problems compared to running it from the ignition on?

Having the fan run at all times: it is not needed on the highway, as ambient air 'flows' more than the fan does. The fan being on is an impediment at that time. Also the fan motor lifespan is shortened, as well as creating a start-up draw which is not normally there. And when the t-stat is closed (when the car is warming up), having the fan on is a waste.

If you connect pin 14 to the battery, the fan will run 24/7. not nice.

Doing the switches is very easy - you could even toss them under the dash where you can access them but you dont need to worry about mounting switches, etc. I mounted my switches in the ashtray. Chris (CMan1914) had a real nice thread about doing all this a little while back if you want to read more info.

Good luck.

V8302stangs · Aug 1, 2005

Ah k thanks for the 411 I just finished installing my switch and am going to give it a little test run here in a minute. So exciting! lol

nmcgrawj · Aug 2, 2005

I fixed the problem...ending up being the fan motor

HISSIN50 · Aug 2, 2005

Glad to hear it Nate, Dale, et al.

V8302stangs · Aug 3, 2005

This fan switch kicks arse. I wish I used a switch with a light, I'll get around to it one of those days.

High speed fan not working!!!!!

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