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Ungar 6970 heat gun. fan starts and slows to stop within 10 seconds.

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Hello, replace the fan. GB...stewbison

Posted on Sep 07, 2011

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Posted on Jan 02, 2017

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WHY IS MY HINO 500 TRUCK OVER HEATING ALMOST TO THE RED ZONE AND THE COOLANT LEVEL IS ON THE MAXIMUM?


couple of reasons
have a compression test done to determine head gasket or cracked head
watch closely when the over heating starts and if it cools down
it the temp rises when going slow ( heavy traffic, hard pulling up hills , stop lights -- basically when the road speed is low and there is low/no air through the radiator-- check for a faulty fan clutch or viscous fan hub failure ( spins but doesn't pull air )
check for thermostat failure and not opening if from a cold start it is going to over heat within 5 miles of 10 minutes of idling
check for blocked radiator(internal)cores or radiator fins (external) falling off the cores
The first point of call for me would be the fan drive system

Mar 07, 2016 | Cars & Trucks

1 Answer

My laptop won't start up normally. The fans and everything begin to turn and start when I press the power button, but within seconds, they start to slow down and eventually stop.


You did not post anything about make and model. This is kind of a guess.

My laptop has "battery saving" setting that operate the fan based on temperature. When I start up, the fan comes on and the computer checks itself, Then the fan slows down. Later when the laptop warms up, the fan speeds up. See if you have some power management scheme set that makes the fan run like this before you take it to the shop.

Your laptop should be under warranty.

May 09, 2015 | Computers & Internet

1 Answer

I had a custom built computer that was damaged in shipping: P55A-UD4, i7 860, ATI HD 5870, 8GB ram, Windows 64 bit, 120GB SSD running 3 monitors (2x20" 5:4, 24" 16:10). It would start-up but fail...


With everything you have i would look at power supply and see if you have enough power supply to operate video card motherboard etc.
Power supply could be overloaded and not able to operate video card correctly.
Which could cause issues with trying to run 2 or 3 monitors

May 18, 2011 | Gigabyte ATI RADEON 6970 HD 880MHz 2GB...

1 Answer

The Ungar we use at work was working just fine. Tried turning it on after only a short time of usage to shrink some shrink on a cable and she wouldn't fire up. Pulled her apart and can't see any really...


When testing a diode you need to lift one end of the component to prevent a second path of continuity. If you lift one end, and you have continuity in both directions when reversing the polarity, it would be shorted or defective. Does your Fluke have a Diode or Semiconductor setting? This will show you the voltage drop for the N/P junction which will be a better test than using the Ohm setting. If the diodes check good, test the motor windings, switch and heating element.

Mar 03, 2011 | Weller Ungar 1095 Dual Temperature Heat...

1 Answer

3 red lights fan works for a few seconds then stops.


If adjusting the screws on the heat sinks and using different size washers does not fix the problems you will need to reflow the motherboard. The absolute best reflow is performed using a rework station, although these are so expensive they are out of the realm of most hobbyists. I have a repair shop with a station if you want to be sure. I'll give you instructions on a possibly cheaper alternative, I fixed a bunch using this method when I first started way back in the early Xbox days.

You can also reflow using an oven or a heat gun. I've had better success with the heat gun.
The goal here is to heat the chips to about 260 C, the problem with the heat gun is it is a very imprecise method... Surprisingly though if done correctly it can work quite well. I must warn you though that if done incorrectly it could damage the MB beyond repair. I will give instructions below, let me know if you have any questions.

Essentially you will need to cover the outside of the board, including all the plastic capacitors with 5-10 layers of thick tin foil. You want to leave the CPU, GPU, RAM chips, and southbridge exposed for reflow. Put the foil on gently so as not to bend the capacitors, but firmly enough so it does not get blown off by the heat gun. Put the motherboard on a flat non-flammable surface.
Take your heat gun and start on low holding the heat gun about 4-5 inches away from the board. You cannot bump into or touch the motherboard during this process, you are basically liquefying the solder balls in between the SMDs. If you bump the board it will seriously mess it up so be careful.
You will want to move in a circular motion heating the board up evenly, do not stop moving the heatgun in the horizontal circular motion above the motherboard during this whole process. Do this for 2 minutes, then switch the heatgun to high and continue for 3 minutes, then switch back to low and go for 2 minutes. Keep the heatgun moving across the top of the board the whole time about 4-5 inches away. After you are done let the board sit for about an hour. Reassemble and test it out! Hopefully you will be greeted by the wonderful green lights! Haha.
Sorry this would be easier if I could post pictures.
Please let me know if you have any questions and good luck!

Mar 05, 2010 | Microsoft Xbox 360 Console

3 Answers

My xbox 360 stopped working with no video & audio. Replaced X-clamp. Now it starts (with no video & audio) and fan runs and after 10 seconds fan get louder and shows 2 red (left) light and fan...


i have only been able to fix one console that has had this problem and is what i did was took only the gpu heatsink off and covered everything but the gpu chip with aluminum foil, leaving only exposed the components that are not plastic, then heated the entire mother board with a heatgun that says it reaches 1100 degrees farenheight, focusing on no particular area for 2 min, heat gun on high with low air speed. after 2 mins. of heating mobo. top and bottom, focus heat on gpu and any where you do not have aluminum foil with heat gun about 14 to 16 inches away moving heat gun in circular motion ( you should use this motion throughout entire process, never keep heat gun in one spot, keep it moving) do this also for 2 mins. mainly focus on gpu though since most likely that is your problem.

Oct 15, 2009 | Microsoft Xbox 360 Console

1 Answer

On a 1997 nissan sentra will the radiator fan run all the time the car is running


No, it should only turn on when the temperature switch tells it to. On a hot day you may hear it running even after shutting off the engine. The fan is set up so that when you are moving at enough speed the fan shuts off to save energy, when you slow down or stop the fan should come on to maintain airflow. If you check it at this point yes it should be running. When you start it cold the fan will not turn on for maybe 10 or more seconds when the engine starts to warm up. Hope this helps.

Things to be concered about; 1.) the fan never seems to turn on. This will cause your engine to overheat when you stop.
2.) Your heat is not working. The heat going away can be a sign that you antifreeze is low and that you are about to overheat.

Aug 08, 2009 | 1997 Nissan Sentra

2 Answers

Boxlight CD-725C TEMP light comes on and unit shuts down afer 10 minutes. Unit has about 1200 hours on the bulb. Seconds before the unit stops, at least one of the fans slows down.


The reason why the temp comes on because the fan is start slow down, so the bulb produce a lot of heat. Once the maximum temp reach, the temperature sensor will become inactive. So boxlight shutdown. First you need to replace the fan, or check the supply dc voltage going to fan if it is stable.

Jul 24, 2009 | Office Equipment & Supplies

1 Answer

Slow oven lighting....bakes for 20 minutes than stops heating


Hi, The oven should ignite within 20 to 30 seconds. The most common problem is that the ignitor gets weak and will not open the gas valve like it should. This would be my first part to change.

May 09, 2009 | Frigidaire FGB24S5A Gas Single Oven

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