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New radiator fan, and now new problems

 
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  #1 (permalink)  
Old 06 Nov 2017, 09:36 pm
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Default New radiator fan, and now new problems

Earlier this year, I replaced both fan relays in my '07 Touring Edition. This past weekend, the radiator fan finally quit completely (I have been researching it for a few months, and it died 15 miles outside of Louisville, KY - replaced at a nearby Chevy dealer who stayed late for me to get it done). Now, the high speed (I suspect, not yet verified) relay is sticking again. I had the coolant flushed a few days later (I had some water in the car, and put that in to top off the reservoir). I believe the Valvoline place that did the flush uses their Max Life works in everything coolant. Lord, I hope that is OK! Anyone have a relay issue after replacing the fan? I can't imagine that the electrical properties of the fan are that different from the OEM to the one the dealer got from NAPA.
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Old 06 Nov 2017, 10:01 pm
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Default Re: New radiator fan, and now new problems

There are a couple of different ways to get that fan from NAPA, bare fan where they reuse the old harness and old relays, or a complete assembly with new wiring harness and new relays. Do you know which one they got? I have had both versions in my PT. On your invoice may be a NAPA part number, what is it?

If they reused the old wiring harness and relays, that could be your problem. Initially the shop got the bare fan and within a couple of weeks, the high speed quit working again. They had to then get another complete fan assembly, install that to fix the issues. On mine, the connector from the fan assembly to the main wiring harness was melted.
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Old 07 Nov 2017, 06:15 am
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Default Re: New radiator fan, and now new problems

My guess is just the fan, but I will double check. I told them it was the one with the 4 pin connector as I had been able to get that much figured out ahead of replacing it myself. I will have to take a peek at the wiring harness to check that out. Thanks!
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Old 07 Nov 2017, 09:17 am
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Default Re: New radiator fan, and now new problems

If you bought the fan assembly with the 4 pin connector, it should have new relays. The part without relays would only have a 3 pin connector. If you look at the clean fan on the right in the picture below, the relay harness is the thick cable going from the 4 pin connnector on the bottom of the housing over to the relays in the upper right corner. The 3 pin connector cable with the blue wires goes from that harness directly to the fan motor. You should be able to tell if the relays were reused or not because the black plastic on the relays and cable would be faded and worn.

The relays are bolted to the upper passenger side of the fan when it is installed in the car.

When you say the high speed relay is sticking, is it on all the time? Did you try the test with turning on the A/C, checking that the fan is running at high speed, then turning the A/C off and seeing the fan go off high speed? (If your engine is already up at operating temperature, the fan could revert to low speed, but you should be able to tell the difference between high and low speed).


Last edited by rsrocket1; 07 Nov 2017 at 09:21 am.
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Old 10 Nov 2017, 10:29 pm
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Default Re: New radiator fan, and now new problems

Thanks! So, here is where I am at now -

1 - I have now replaced (2) high speed fan relays that should be mounted to the radiator fan (see #5).

1a - I am now really good at changing these relays!

2 - I am 98% sure it is the 4 pin version. I don't know for sure yet, as this was replaced by a Chevy dealer about 65 miles north of Louisville, Kentucky last week. I will try to verify tomorrow. I live right outside Chicago, and they were the only ones open.

3 - I get code P0480 about 2 minutes after I clear the car using a cheap OBD2 scanner.

4 - I got the coolant flushed and replaced a few days after I got to where I was going, so I can safely say the coolant is good.

5 - The dealer did not put the relays back on the fan housing where they were supposed to be. I am NOT happy about that. Not only that, but there is no bracket there. Just the holes where it should be attached. Grrr...

Next up - I am trying to figure out if I change the coolant temp sensor or the wiring harness for the relays. I assume the harness is the next likely suspect, but I suspect I have to get the fan out to replace that harness.
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Old 10 Nov 2017, 10:34 pm
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Default Re: New radiator fan, and now new problems

Fudge - forgot to aff some stuff:

The fan generally stays off after driving. That said, if it stays on when I get where I am going, I just disconnect the + on the battery until I get back. Last night, it was off when I came into the house. When my wife got home 2 hours later, she said the fan was still running. So it started sometime after I went in the house and when she got home. That was last night, and I replaced the second high speed relay this afternoon. The same thing happened this evening, but I checked it about an hour before she got home and the fan was not on. I think that might help narrow down the issue. It is something "smart" as my friend called it, but I am not yet sure what it is.
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Old 10 Nov 2017, 10:38 pm
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Default Re: New radiator fan, and now new problems

I would suggest checking the 4 pin radiator plug that connects to the engine wire harness socket. Make sure the pins have not been pushed in. When I got one of the new radiator fans from RockAuto.com I noticed one of the pins was pushed in so replaced the plug with the plug from the original radiator fan. The original radiator fan plug also has a better seal keeping moisture out of it and fits much better.
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Old 10 Nov 2017, 11:45 pm
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Default Re: New radiator fan, and now new problems

Check this connector at the bottom of the fan, on the drivers side, it was melted on mine when my PT had a fan issue. If they reused the old harness, the contacts in this connector may be melted or show signs of arcing and not making a good connection. You can also apply a very small amount of dielectric grease to the connector prongs to help with making a good electrical connection.



How and where did they mount the relays, did they zip tie them somewhere?

This is how the relays should be mounted to the fan:



If they didn't mount them to the fan, that's not a proper installation. Since you had it done at a dealership, you are still under warranty and you should be able to take it to any other dealership to be corrected.

Did you look on your invoice and does it have a part number for the fan they installed, if so, what is it?

The fact that the relays are not mounted to the fan tells me that they got the bare fan from NAPA and reused the old relays and old wiring harness. If they had gotten the complete assembly the relays would already be mounted onto the fan housing.
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Last edited by rckstein; 11 Nov 2017 at 12:30 am.
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Old 11 Nov 2017, 06:41 am
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Default Re: New radiator fan, and now new problems

Quote:
Originally Posted by siamese_retriever View Post
Fudge - forgot to aff some stuff:

The fan generally stays off after driving. That said, if it stays on when I get where I am going, I just disconnect the + on the battery until I get back. Last night, it was off when I came into the house. When my wife got home 2 hours later, she said the fan was still running. So it started sometime after I went in the house and when she got home. That was last night, and I replaced the second high speed relay this afternoon. The same thing happened this evening, but I checked it about an hour before she got home and the fan was not on. I think that might help narrow down the issue. It is something "smart" as my friend called it, but I am not yet sure what it is.

Mine did this for about a week after the hurricane, then it stopped. I can only assume that something got wet. I keep the relays in the console in case I need them. Pull fuse #15 instead of unhooking battery.

http://www.ptcruiserlinks.com/forum/...tml#post669535
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Old 11 Nov 2017, 12:40 pm
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Default Re: New radiator fan, and now new problems

If the radiator relays have been replaced and verified to be in proper working condition I would suggest checking the engine coolant temperature sensor.

Any engine will get hotter for a brief time after you shut it off. This is entirely normal. The temperature will spike upwards because the water pump is no longer circulating coolant through the radiator.

The temperature spikes upwards and a coolant temp sensor will activate the fan and keep it running until the coolant temp drops below what the sensor is rated at. Usually the radiator fan will kick off after 5 minutes or so, depending on a number of factors.
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