[87shark]

Ok, thought it would be a great idea to replace the stock thermostat and upgrade to a hypertec 200 degree fan switch. Got all the work done and some ramdom cleaning. Now the darn fan will not switch on. With the new fan switch it is supposed to come on at 200 and off at 185. It will not come on at all. Swapped the stock fan switch back in and no joy either.

Not a problem, maybe the relay went tits up. Replaced the fan relay.... Guess what..... Still dont work. Followed the trouble shooting tree. Grounded the wires for the fan, and it blows just fine. Grounded the fan switch... no worky...

Im totally confused here and feel like i am chasing my tail. Did I miss something? Any suggestions would help.

O, and just to make things more interesting, I now have a code 44. (fuel Lean Mixture)

WTF, maybe some dynomite will fix it.

 

[87shark]

Also noticed that when I go into diagnostic mode, the fan does not blow. I keep thinking relay, but have replaced it already. Maybe I got a bad one?

 

[raidmagic]

Maybe a bad relay but that is strange. Hopefully someone with some brains can help you out.

 

[87shark]

From what I remember, the fan is supposed to blow in diagnostic mode right?

 

[87shark]

Someone please help........

 

[elints]

I have no idea about the diagnostic mode.

The normal sequence is the temperature switch provides a ground to the relay that powers the fan. If you grounded the fan and it functioned then either the relay is not working or you have a blown relay power fuse. Try jumping the temperature switch and see if the fan relay energizes(fan starts). If it doesn't either the relay is bad or you don't have power to it.

A multimeter is always a good friend at these times.

HTH

 

[NICKO]

where are you grounding the relay at? make sure that you do it at the plug end at the sensor, the wire is somewhat small it may have a brake in it. also make sure you didn't bend the top part of the sensor it will not work if it is damaged. one last thing what type of thread sealent did you use on it, you may have made it hard for it to ground.:thumbsup: