1989 190e 2.6 aux fan problem - PeachParts Mercedes-Benz Forum

190E2 · #1 05-02-2006, 12:42 PM

My 190e 2.6 will run hot with a/c on and my two fans won't start. I hooked both fans to power source and they run fine but won't start when necessary. I have read threads saying where relays are located but not on a 190e. Also, I have failed to locate relays under fuse box located on drivers side under the hood. Help!!!!!

dan dang · #2 05-02-2006, 01:44 PM

I have the same problem and i found out that the resitor is bad. I think you need to replaced fuse D to 25A.

190E2 · #3 05-02-2006, 10:31 PM

Thanks Dan, but which resistor is bad and where is it located on the 190e 2.6? Also, where is fuse D, in fuse box or elsewhere?

Gunawan · #4 05-03-2006, 06:58 AM

Hi 190E2,
I had the similar problem you have on my 88'300E.
But for your problem there are two posibilities:
1. The thermoswitch, which is located on the cylinder head. At that time if I remove the socket to the thermoswitch the fan run at high speed. So my conclusion is thermoswitch is good.
2. The resistor located on top of the front tyre mound inside the trunk. Possibly on the left hand side. (Mine is a right hand drive car). It is a rectangle thing made out of ceramics with two cables on either end. To check try put a jumper between the two cable, if the fan run, then you should change the resistor.

Hope it will helps you.
Bye

190E2 · #5 05-03-2006, 12:19 PM

Thanks Gunawan,
I will check it out when I get home.
190e2

mctwin2kman · #6 05-03-2006, 12:36 PM

It is behind the drivers headlight on the exposed portion of the frame rail on the LHD vehicle.

yal · #7 05-03-2006, 01:56 PM

3. It could be the pressure switch for the A/C which also triggers the fans to come on.

190E2 · #8 05-04-2006, 07:05 AM

Thanks Guys, I replaced the resistor behind the left headlight. The old resistor was definitely bad but that wasn't enough. Where is the pressure switch for the A/C Yal is talking about?
Thanks

190E2 · #9 05-08-2006, 09:37 AM

Guess what? I found a fuse that was bad. It didn't look bad until I pulled it out to check it and it fell apart in my fingers. After I replaced the fuse, the fans started working. I'm sure that replacing the resistor along with the fuse is what fixed the problem. I hope this resolves things for at least a little while.
Thanks for all your help,
190e2

Redfar · #10 05-08-2006, 02:55 PM

Is the switch you're talking about is located with the drier red switch?because I think I have the same problem.

Thanks

190E2 · #11 05-09-2006, 09:52 AM

Hey Redfar, the resistor is located on the frame approx. 12 inches or less from the drier towards the firewall. It is made of ceramic material. The wire connector screws were really rusted up. I had to cut them off with my dremel tool using a cutting wheel so I could still use the original wire connector ends. If you go to www.speedycarparts.com they will give you a picture of the part so you will know what you are looking for.

yal · #12 05-09-2006, 12:02 PM

Quote:

Originally Posted by Redfar

Is the switch you're talking about is located with the drier red switch?because I think I have the same problem.

Thanks

Yes thats the switch. But do check the resistor first.

Also just like 190E2 found out just don't eyeball the fuses, take them out, clean the contacts an re-install with new ones if possible.