Overheating, Need HELP!


Information and questions on GL1500 Goldwings (1988-2000)
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SgtCharlie
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Overheating, Need HELP!

Postby SgtCharlie » Sun Sep 15, 2013 3:04 pm



Ok, I just did a find on the words "FAN" and "OVER HEATING" and spent the last 30 minutes reading everything I could find on here about the fans on my 1995. The bike has always run hot especially since I'm in El Paso, TX where the temp gets to 100+ routinely, so I didn't think much of it when it ran a "little hotter" than normal this morning on the way to work. However, when I had to slow down to come through the gate at my military installation, the temp gauge rocketed past the white line and into the red! OH NO!
I went to the gas stations immediately and hosed down the radiator with water which brought the temp down and there's no knocking or abnormal sounds so I think the engine is ok, but...

Both of my fans have quit working! I checked the fuse, which was ok, changed it out just for S&G's and that didn't change anything. Now I'm on here.
I've read that they are both controlled from the same switch. Where is that switch and how do I check the switch itself. I'm planning on conducting the 12V power check on both fans to make sure they are working, but no one so far (that I could find anyway) has a video or pictorial of checking the fans switch or changing the thermostat.

Please help with any information! I'm a pretty good "backyard mechanic" so I'm definitely planning on doing the work myself. Unfortunately, this is my primary vehicle right now and I really can't have her down for more than a day or two. It would hurt a lot if I had to wait for parts to come in.

I'm assuming, since it's still summer time here in EP, TX that it wouldn't hurt too much to just remove the thermostat all together (if that's part of the problem) temporarily until I get one in from online? Although it sounds like a job that I don't want to have to do twice, if I can help it.

Thanks again for any help!
Sgt Charlie


Sgt Charlie
86th Signal Battalion
Fort Bliss, TX

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SgtCharlie
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Re: Overheating, Need HELP!

Postby SgtCharlie » Sun Sep 15, 2013 3:06 pm

Oh, just in case someone hasn't seen the schematic that I found on another post here on this forum, I'll put it here.
Sgt Charlie
86th Signal Battalion
Fort Bliss, TX

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ct1500
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Re: Overheating, Need HELP!

Postby ct1500 » Sun Sep 15, 2013 3:52 pm

When the engine has cooled off first thing to do is check coolant level by removing radiator cap. If it takes a quart or two you got a leak that must be fixed first and would be the reason fans did not come on.

To gain access to cap remove right plastic handlebar filler. Cap is to the right and below ignition switch. If OK go to left side radiator and ground wire from sensor at base of radiator to confirm fans will come on.

Contrary to popular belief running an engine without a t-stat will almost certainly lead to running hot.
This is what I do
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SgtCharlie
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Re: Overheating, Need HELP!

Postby SgtCharlie » Sun Sep 15, 2013 4:06 pm

Roger that. I plan on doing the ground test as soon as I can. I've already determined that I don't have a leak.

Sgt Charlie
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Fort Bliss, TX

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ct1500
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Re: Overheating, Need HELP!

Postby ct1500 » Sun Sep 15, 2013 4:20 pm

Do not take for granted coolant level, it must be checked by removing cap.
This is what I do
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Fiberthree
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Re: Overheating, Need HELP!

Postby Fiberthree » Sun Sep 15, 2013 5:08 pm

ct1500 wrote:...Contrary to popular belief running an engine without a t-stat will almost certainly lead to running hot.


+1 There! The thermostat also keeps the coolant in the radiator long enough to let the radiator cool it some.

When my 1500 started to run hotter, I checked the overflow tank right after a ride and found the coolant was cold! My thermostat had stuck shut, not allowing the stuff to flow anywhere.
Ed

WARNING: All posts are subject to influence from an uncontrollable dominant sarcastic gene. Offensive remarks may or may not be intentional.

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SgtCharlie
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Re: Overheating, Need HELP!

Postby SgtCharlie » Sun Sep 15, 2013 5:25 pm

Yeah, I thought about it sticking shut but the overflow reservoir was boiling when I stopped, so its definitely not that.

If the fans work when I ground the switch wire to ground, then where can I get a new switch? Also, will it be ok to just make the fans "constant on" with the ignition on until I get a new switch?
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86th Signal Battalion
Fort Bliss, TX

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Re: Overheating, Need HELP!

Postby WingAdmin » Sun Sep 15, 2013 11:17 pm

SgtCharlie wrote:Yeah, I thought about it sticking shut but the overflow reservoir was boiling when I stopped, so its definitely not that.

If the fans work when I ground the switch wire to ground, then where can I get a new switch? Also, will it be ok to just make the fans "constant on" with the ignition on until I get a new switch?


Item 15, part number 37760-MT2-003, thermostat switch, $39.56: http://partsfinder.onlinemicrofiche.com ... ING-SYSTEM

And yes, no harm in running the fans 100% of the time until you get a new switch.

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ct1500
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Re: Overheating, Need HELP!

Postby ct1500 » Mon Sep 16, 2013 12:19 am

SgtCharlie wrote:Yeah, I thought about it sticking shut but the overflow reservoir was boiling when I stopped, so its definitely not that.


During an overheat steam will also be pushed into recovery tank.
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Fiberthree
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Re: Overheating, Need HELP!

Postby Fiberthree » Mon Sep 16, 2013 9:49 am

Antifreeze in a pressurized system will boil at a higher temperature than 212 degrees, so thats got to be pretty hot! That boiling could also be a blown head gasket and you are getting air pumped into your cooling system by the pistons. The fan switch might be reading hot air and not coolant. You could check your spark plugs to see which cylinder it is. What was the result of checking the radiator fluid level? Did you have to top it off?
Ed

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ct1500
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Re: Overheating, Need HELP!

Postby ct1500 » Mon Sep 16, 2013 11:35 am

Your typical coolant/temp sensor will not work correctly if they are not immersed in a liquid.

A slow leak over time would drop level below fan switch (knocking it off line) but not the temp gauge sensor yet which is on tstat housing and still reading correctly.

While underway fans will not operate as air flow through radiator is enough to cool. Most likely cause of running hotter than normal underway (which Sgt. noticed) would be low coolant level, followed by tstat malfunction and then plugged radiators.
This is what I do
Local and need repair help with your 1500, Valkyrie or ST please PM

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Aussie81Interstate
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Re: Overheating, Need HELP!

Postby Aussie81Interstate » Sun Dec 13, 2015 6:49 pm

Bump this post - just so I can see it when I get home tonight

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MikeB
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Re: Overheating, Need HELP!

Postby MikeB » Mon Dec 14, 2015 6:17 pm

I'm curious if he got it fixed or not.
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Re: Overheating, Need HELP!

Postby OldZX11Rider » Tue Dec 15, 2015 8:25 pm

If I understand right, the fans, when the key is on, are electrically "hot". The fans come on by completing the ground circuit.
If that is correct, then all he needs to do is complete the grounding of the fans. Couldn't he do that and just put a simple toggle switch in the ground wire to turn the fans on & off as needed? Just until the problem was figured out, parts ordered and time to make proper repairs was made.
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Re: Overheating, Need HELP!

Postby seelyark1 » Tue Dec 15, 2015 10:37 pm

Look for that switch on the bottom of the left radiator. Remember that adding coolant to the overflow tank does not get it to the radiator.
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Re: Overheating, Need HELP!

Postby spiralout » Wed Dec 16, 2015 1:20 pm

Aussie81Interstate wrote:Bump this post - just so I can see it when I get home tonight

Bad forum etiquette. There are tools you can use for that instead.


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Aussie81Interstate
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Re: Overheating, Need HELP!

Postby Aussie81Interstate » Wed Dec 16, 2015 4:32 pm

sorry Spiral - how do I do that - I'm a bit of a neanderthal when it comes to this sort of stuff. :)

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Aussie81Interstate
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Re: Overheating, Need HELP!

Postby Aussie81Interstate » Fri Dec 18, 2015 6:16 am

Spiral

thanks - I now know how to do non-neanderthal things - much appreciated. :)




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