PT Cruiser Forum  
Advertisements
       

Go Back   PT Cruiser Forum > General Forums > Tech & Performance Forum

PT Cruiser Forum

Advertisements
Wiring to Radiator Fan

 
Like Tree7Likes

Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 07 Jun 2016, 06:47 pm
Fresh Cruiser
 
Join Date: Jul 2010
Location: Twin Cities, MN
Posts: 37
Default Wiring to Radiator Fan

Hey there,

I noticed my new radiator fan was not working, so I disconnected it and ran 12v to each speed and they fired up perfectly. Afterwards, I checked the relays and fuse (all great) so then I tried checking the continuity between the Fuse 5 terminals and the wiring harness going to the fan. The terminal on the back and one of the positive harness terminals checked out great, but the front terminal showed zero continuity. Would this suggest a bad wire, or even issues with the ECM? I am at a loss on this one since it worked great for seven days and then something goofy happened with the electrical.

Thank you for your suggestions!
Reply With Quote
  #2 (permalink)  
Old 07 Jun 2016, 07:25 pm
Obsessed Cruiser
 
Join Date: Aug 2014
Location: Thousand Oaks, CA
Posts: 6,243
Default Re: Wiring to Radiator Fan

What year is your PT Cruiser?

What caused you to replace the radiator fan?

We need a little history of what happened when the original radiator fan failed.
__________________
If at First You Don't Succeed - Try, Try Again
Reply With Quote
  #3 (permalink)  
Old 07 Jun 2016, 07:43 pm
Fresh Cruiser
 
Join Date: Jul 2010
Location: Twin Cities, MN
Posts: 37
Default Re: Wiring to Radiator Fan

It is a 2002, which was starting to run hot about 10 days ago (which is about the time the temperatures started rising here in Minnesota). Fortunately, we kept it out of harms way (heat on high, never letting it get into the red). The low speed stopped working on the old fan so I replaced it. It started to heat up quickly again, so I changed the thermostat, temp sensor, pulled and flushed the radiator (and sprayed the fins well), added new HOAT (diluted with distilled water). Zero leaks or lost fluid. Burped the system well with the valve and 1/4" hose. It worked perfect for about seven days (bumper to bumper commute, highway driving, A/C running, etc.).

My wife drove through a cloud of bugs about 10 days ago, which is when the issues began. I cleared plenty of them from the radiator, condenser, and transmission cooler.

Today, it started running hot again and quickly determined that the high and low speeds of the radiator fan were not coming on. Both fan speeds checked out great with the 12v battery and the relays tested great (Ohm meter, 12v power, etc.). I just lost power for some reason.

Any thoughts?

Thanks!
Reply With Quote
  #4 (permalink)  
Old 07 Jun 2016, 10:43 pm
Senior Cruiser
 
Join Date: Jan 2014
Location: SW PA
Posts: 1,194
Default Re: Wiring to Radiator Fan

If you were checking for 12 volts at the wiring harness connector, you also need to check the condition of the pins, look close and you may find damage from heat which will loosen the ground connection pin. Check it to ground and you still have continuity but the loose pin causes the circuit open when there is an amp draw from heat (from the bad connection). I just soldered a jumper wire around the connector and had no more problems.
I tried using male /female connectors on the jumper but they too failed.
jeremysaal likes this.
__________________
Addicted to Mopar You can tell how old I am..
65 Dodge Coronet 6 cyl 2dr Post
66 Ply Satellite with 273 engine swap to 69 340 4spd
70 340 4spd Dart Swinger "Those were the days my friend"
73 Charger SE
Had a few Vetts on the way 69, 85
Several Neons some flips
01 Sebring flip
Cruiser's 01, 220K Gone to a new home
Cruiser 03 133K Gone to a new home
Cruiser 06 110K Project
Cruiser 05 Ltd 120,809 bought with broken belt Oct2015
May 16 Resurrected to once again roam the streets.

20 Miles South Of Pittsburgh
Reply With Quote
  #5 (permalink)  
Old 07 Jun 2016, 11:11 pm
Obsessed Cruiser
 
Join Date: Aug 2014
Location: Thousand Oaks, CA
Posts: 6,243
Default Re: Wiring to Radiator Fan

With the ignition off, pull off the low speed fan relay, start the engine and see if your high speed radiator fan comes on. If it does not come on, you have a problem between the fan relays and the radiator fan.

Also just as a reminder the wire harness drops down under the engine on many of the 2002 PT Cruisers and hits the half shaft burning through wires and shorting the wires to ground. Check and make sure this is okay.
jeremysaal likes this.
__________________
If at First You Don't Succeed - Try, Try Again

Last edited by ptcruisersteve; 07 Jun 2016 at 11:14 pm.
Reply With Quote
  #6 (permalink)  
Old 08 Jun 2016, 06:47 pm
Fresh Cruiser
 
Join Date: Jul 2010
Location: Twin Cities, MN
Posts: 37
Default Re: Wiring to Radiator Fan

Thank you for the advice! Just as you both described, the connection was slightly melted. I picked up a new one from the local U-Pull place and it works great once again.

Thanks again and have a good one!
rckstein likes this.
Reply With Quote
  #7 (permalink)  
Old 08 Jun 2016, 07:26 pm
Regular Cruiser
 
Join Date: Mar 2011
Posts: 164
Default Re: Wiring to Radiator Fan

But why did the old connector melt?
Reply With Quote
  #8 (permalink)  
Old 08 Jun 2016, 07:42 pm
rckstein's Avatar
Obsessed Cruiser
 
Join Date: Dec 2010
Location: Euless, TX
Posts: 12,035
Default Re: Wiring to Radiator Fan

Quote:
Originally Posted by alanrw View Post
But why did the old connector melt?
The same thing happened to my PT recently. I had to have the fan assembly replaced because the high speed was not working. It worked fine for a couple of weeks then the high speed stopped working again. I took it back to the shop that installed the fan and they found that the connector on the fan harness was slightly melted. They had to get another fan assembly that included the wiring harness, they took the harness off that fan to put on my PT. They didn't charge me any additional as they could have gotten the fan with a new harness from the start, instead of trying to cut corners. So now they are stuck with the other fan that has no harness, but not my problem. As far as the melted connector, probably just old age. The fan has been replaced a couple of times under warranty with OEM units, and those probably don't include a new wiring harness, or relays, like the after-markets do.
__________________

'06 Touring Edition NA Automatic
150k Miles / Electric Blue Pearl
USMC '82 - '93
Reply With Quote
  #9 (permalink)  
Old 08 Jun 2016, 07:50 pm
Regular Cruiser
 
Join Date: Mar 2011
Posts: 164
Default Re: Wiring to Radiator Fan

Connectors melt when more amps than the connector is rated for go thru the connector. If the cause of the high amps are not dealt with, he will end up melting this connector. It could be a case of bearing seizure in the fan which can cause hi amp draw.
lrbbs likes this.
Reply With Quote
  #10 (permalink)  
Old 08 Jun 2016, 07:53 pm
Senior Cruiser
 
Join Date: Jan 2014
Location: SW PA
Posts: 1,194
Default Re: Wiring to Radiator Fan

Quote:
Originally Posted by alanrw View Post
But why did the old connector melt?
The fan cycling of and on frequently and the brushes near end of life causing momentary on and off causes higher a higher amp draw as electric motor starts causes heat..

Same thing would happen to automatic trans if there were constant momentary shifts, it would build heat, something would let go...
__________________
Addicted to Mopar You can tell how old I am..
65 Dodge Coronet 6 cyl 2dr Post
66 Ply Satellite with 273 engine swap to 69 340 4spd
70 340 4spd Dart Swinger "Those were the days my friend"
73 Charger SE
Had a few Vetts on the way 69, 85
Several Neons some flips
01 Sebring flip
Cruiser's 01, 220K Gone to a new home
Cruiser 03 133K Gone to a new home
Cruiser 06 110K Project
Cruiser 05 Ltd 120,809 bought with broken belt Oct2015
May 16 Resurrected to once again roam the streets.

20 Miles South Of Pittsburgh
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Radiator Fan wiring harness BlueWoody Tech & Performance Forum 2 01 Feb 2015 04:35 pm
wiring help please Ttomes Exterior Accessories Forum 8 14 Oct 2014 06:36 pm
wiring on 07? brightlight07 Sound and Security Forum 2 28 Nov 2012 01:11 pm
UK PT Wiring Jassy General PT Cruiser Discussions 1 15 Nov 2011 01:47 pm
possible to fix wiring thats... sflamedic General PT Cruiser Discussions 2 04 Mar 2008 08:37 pm


All times are GMT -5. The time now is 01:46 pm.




Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.
vB.Sponsors