| Author |
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stecz
| | Posted on Wednesday, May 01, 2002 - 11:47 pm: | 
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(97 disco automatic). I have a problem where the truck runs at a normal temperature (right at, or just below half on the gauge) in pretty much all circumstances, but if the ambient outside temp is above 90, and I sit in traffic, the engine gets extremely hot. This didn't happen all winter in stop and go traffic, but the first 90+ degree day of the year and it's happened again.
I can cool the engine down by putting it in neutral and revving it to about 2k rpm. As soon as I start moving at a reasonable speed, or just rev the engine in neutral, the temperature comes right down to normal. Any ideas? The fan clutch seems like it's is stiff when it's hot and pretty much freewheels while cold. Also, when it's hot out, I can tell the fan clutch is stiff because I hear the fan a lot more.
I think I'm going to pull the radiator and have it cored. Anything else I should look at? It has a relatively new thermostat, but I'll probably replace that while the radiator is out... |
marty amedeo (Marty)
| | Posted on Thursday, May 02, 2002 - 06:39 pm: |
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Before you go pulling the radiator, check to make sure the fins are not plugged with mud and debris, especially near the bottom of the radiator.
If it is, flush it good with a hose or better yet with a pressure washer. You may want to remove the grille from the front to make it easier. While you're at it, also clean the transmission cooler, the round fins at the bottom. |
Rob Choromokos
| | Posted on Thursday, May 02, 2002 - 10:32 pm: |
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My 95 disco did the same thing on my recent trip from Chicago to Florida. Never seemed to get hot in the Chicago winter. Biggest source of overheating is loss of system pressure. Look for a small leak somewhere. Mine was the purge/fill tank had a pinhole that only became visible when I revved the engine and the system would begin to build pressure. Next time it overheated, the heater hose had a pinhole at the firewall - agian loss of pressure, then coolant.
Electric fans kick on anyway after certain temperature, reving the engine only increases the circulation of the water pump. Make sure the system is full of coolant and holding pressure above idle. I have a lot of painfull experience at this overheating thing.....can't imagine radiator problems on a '97.
Robc |
Doug Wendyker
| | Posted on Friday, May 03, 2002 - 12:23 pm: |
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Check the Viscous Fan even if you hear it. It could still be shot. My old 325 bimmer had the same problem with similar conditions. When the truck is running hot use a rolled up news paper to try to stop the fan. If its functioning properly you should not be able to stop it. If your able to slow it down it could be on its way out. Its a simple test, use common sense and don't loose any fingers.
-Doug |
charles
| | Posted on Friday, May 03, 2002 - 12:34 pm: |
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Here in Texas my rover did the same thing. I just turned off the ac. I was stuck in traffic at the Mexico border for an hour 100 plus degrees. My fan comes on more now that is hotter.
Charles |
doug james (Dgj95lwb)
| | Posted on Friday, May 03, 2002 - 04:26 pm: |
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"pretty much freewheels when cold"...
Your comment leads to this evaluation:
Engine OFF-your vc fan should spin-less than 90 degrees-when cold, when spun/pushed by hand. Less than, its' fine; more than, then it's toast. If it is totally 'free'=replace, do not pass go. You test these when cold. Happy Rovering, doug james |
jp
| | Posted on Wednesday, May 08, 2002 - 05:17 am: |
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Sounds like viscous coupling not driving fan. some of these units can be refilled. You can buy silicon fluid from Toyota dealers - 3 viscosities (3000,6000,10000 cp) - probably need 2 bottles.
Remove the coiled spring thing on front from its anchor (silicon blob), and you should be able to pull it off the centre pin. IF the centre pin will come out, you can pump the silcon in with a small syringe (5ml). Set the unit up horizontal and apply some heat with a hair dryer will help to spread the silicon out to the edges. If you cant get the centre pin out, you are sh!t out of luck. |
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