Fans wont shut off no temp reading.

**Smittro** · 01-01-2011, 06:07 AM

I started her up to move her around yesterday, when both fans came on and wont shut off. Temp guage will not rise with engine heat. I changed the temp switch and still nothing. Engine is NOT over heating no SES light.. Coolant level is perfect no air trapped.. Suggestions?

**pajeff02** · 01-01-2011, 06:18 AM

Is the HVAC system totally off?

**Smittro** · 01-01-2011, 06:19 AM

This morning I went out fired it up and even when the engine is cold from sitting over night the fans come on. I also noticed while I stood there that the fans began to increase in rpms to the point where they almost sounded like they are both running too fast.

**Smittro** · 01-01-2011, 06:20 AM

Originally Posted by pajeff02

Is the HVAC system totally off?

Yes. I thought it might be a AC switch issue but alas no..

**pajeff02** · 01-01-2011, 06:23 AM

Other than the coolant temp switch and HVAC system, there are no other mechanical controls for the fans that I know of. Has to be a faulty relay, wiring or PCM issue then, doesn't it?

**Smittro** · 01-01-2011, 06:29 AM

Originally Posted by pajeff02

Other than the coolant temp switch and HVAC system, there are no other mechanical controls for the fans that I know of. Has to be a faulty relay, wiring or PCM issue then, doesn't it?

I had that feeling. Because I switched out the relays swapping one for the other and as soon as they'er plugged in the fans still came on.. Both curcuits are energized..

**pajeff02** · 01-01-2011, 06:31 AM

Do you have an electrical schematic for the fan system?

**Smittro** · 01-01-2011, 06:32 AM

Originally Posted by pajeff02

Do you have an electrical schematic for the fan system?

Yes

**pajeff02** · 01-01-2011, 06:34 AM

Looks like you found your project for the day! I have to get back to my closet door installtion. I'll check in later to see what you find.

**Smittro** · 01-01-2011, 07:17 AM

Originally Posted by pajeff02

Looks like you found your project for the day! I have to get back to my closet door installtion. I'll check in later to see what you find.

Bad #3 relay.. I pulled 1 and 2 swapped them and had the same condition. Tapped on #3 and the guage shot up to normal and the fans turned off..

We'll see if it returns with a new relay..

**Smittro** · 01-01-2011, 07:36 AM

**Firebirdjones** · 01-01-2011, 09:20 AM

Wow, makes ya want to carry 3-4 spare relays in the car at all times doesn't it? I Would hate for one to decide to quit while 100's of miles from home. Especially one that is critical,,,like a fuel pump

Glad it was an easy fix.

**pajeff02** · 01-01-2011, 09:27 AM

Cool! Now you can get back to work on your other project -- you are on a 6 month countdown.

**Smittro** · 01-02-2011, 09:26 AM

Originally Posted by Firebirdjones

Wow, makes ya want to carry 3-4 spare relays in the car at all times doesn't it? I Would hate for one to decide to quit while 100's of miles from home. Especially one that is critical,,,like a fuel pump

Glad it was an easy fix.

I already keep a serp. belt and a spare wrench to fit it, 1 quart of oil, and a bottle of anti freeze..lol

Originally Posted by pajeff02

Cool! Now you can get back to work on your other project -- you are on a 6 month countdown.

.....and the Camaro project comming too..

**az gt eater** · 01-02-2011, 09:47 AM

Originally Posted by Smittro

I already keep a serp. belt and a spare wrench to fit it, 1 quart of oil, and a bottle of anti freeze..lol

That's funny cause when I owned a Ford, i used to carry half my garage around. Now its like you said,serp belt,spare tire,jumper cables,water. And I really carry the water for other people.

**Firebirdjones** · 01-02-2011, 09:48 AM

Originally Posted by Smittro

I already keep a serp. belt and a spare wrench to fit it, 1 quart of oil, and a bottle of anti freeze..lol

You sound like me. On long vacation trips I'll pack the belts too, as well as a tool kit for small things. I also keep a couple of spare relays in the car, as well as the laptop to diagnose any check engine lights that might pop up. A gallon of antifreeze as well.

That's about as far as it goes for the 4th gens unfortunately. Because if anything electronic were to pop up it's not a simple road side repair and pretty much requires a hook at that point.

The classic cars are much easier for road trips. I keep a set of points along with a dwell meter, a spare coil, fuel pump, antifreeze. That's about it, and it pretty much covers anything that might stop the engine from running

Spark and fuel is about it for those cars. I can do any of it on the road side in short order without being towed. Simplicity sure is nice, I digress.

**pajeff02** · 01-02-2011, 10:34 AM

^^ Essentially the same, plus tire plugs and a roadside air compressor.

**Smittro** · 01-02-2011, 01:36 PM

Originally Posted by Firebirdjones

You sound like me. On long vacation trips I'll pack the belts too, as well as a tool kit for small things. I also keep a couple of spare relays in the car, as well as the laptop to diagnose any check engine lights that might pop up. A gallon of antifreeze as well.

That's about as far as it goes for the 4th gens unfortunately. Because if anything electronic were to pop up it's not a simple road side repair and pretty much requires a hook at that point.

The classic cars are much easier for road trips. I keep a set of points along with a dwell meter, a spare coil, fuel pump, antifreeze. That's about it, and it pretty much covers anything that might stop the engine from running

Spark and fuel is about it for those cars. I can do any of it on the road side in short order without being towed. Simplicity sure is nice, I digress.

Originally Posted by pajeff02

^^ Essentially the same, plus tire plugs and a roadside air compressor.

I used to carry a spare ECM in my 1st gen z34..

**Firebirdjones** · 01-02-2011, 02:09 PM

Originally Posted by pajeff02

^^ Essentially the same, plus tire plugs and a roadside air compressor.

Ah yes, I forgot to mention I carry a small air compressor and a tire plug kit, along with a small scissor style jack. (I hate bumper jacks) Sure beats changing the tire.