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  #1  
Old 11-21-2010, 01:47 PM
frogbob frogbob is offline
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Default Overheating on short drives

I have been dealing with an interesting problem over the last several weeks. My truck started overheating when I go on short drives, once it heats up to normal temperature it just keeps going up. It goes all the way to just below the red line sits and either just sits there or slowly goes back down but never back to normal.
If I get on the highway the temperature spikes and then just sits hot just before the read line for about 2 minutes (as long as I am accelerating about 60mph ) then quickly drops to normal temperature. After about 20-30min of very normal temperature it slowly starts creeping up again until just before the red line. Then it starts the two minute cycle again...
I tried changing the thermostat right at the start of the problem and that seemed to work for about 2 weeks but it started up again. The coolant is full too. Could this be a water pump problem?
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Old 11-21-2010, 02:26 PM
Cooter83 Cooter83 is offline
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Default Re: Overheating on short drives

This could very easily be the waterpump.... Or the temp sending unit. If the temp sending unit is giving the wrong signals, it's not gonna allow the fan to kick in. Do you notice the fan engaging? Check the water pump for noises and wobbling pulley. It might not be much, but this could show signs of wear in the water pump bearing and must be changed immediately. If the fan is not engaging, check the fan clutch. Start the engine and let it build to operating temperature. You should notice the fan kick on after the temp reaches 180 or so. Check the sending unit by checking continuity between the leads inside the plug. If the multimeter beeps, the sending unit is good (while at operating temperature... Wear gloves).If all is ok, let me know.
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Old 11-25-2010, 11:46 AM
Azhrik Azhrik is offline
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Default Re: Overheating on short drives

My guess is the temperature sensor. I had a similar problem not too long ago but it was the thermostat.
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Old 11-25-2010, 12:15 PM
pooleo pooleo is offline
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Default Re: Overheating on short drives

do you loose heat at any point? try turning your heater on high when the temp goes up, see if the heater will bring it back down.

Last year in my plow truck I had to run with the heater on high all the time to help with overheating.

I would say that your pump is working as when you rev it the temp drops, because your circulating the coolant faster. Besides the pump is mechanical, not much to go wrong with other than the bearing, then it will leak.
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Old 11-28-2010, 09:38 PM
frogbob frogbob is offline
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Default Re: Overheating on short drives

Thanks for all the suggestions. I spent 6 hours yesterday messing with it. I ended up changing the water pump, (didn't know that was going to mean taking off the entire AC contraption until 2hours into the project), and changing the thermostat. My old water pump was so worn out on the inside that there were no blades left, just a very small disk. I did not end up changing the temp sending unit; I couldn't find it in my truck or a picture of its location online.
After all new pump the truck doesn't seem to be overheating at all. It runs great and the heat works almost instantly now instead of almost never. I am guessing that the reason the temp dropped when I accelerated was that there was just enough fan left to push some water through if the pressure was increased. That is my guess anyway. Thanks for the help...
However, now when I attempt to start the truck it just keeps quickly turning over and over but not starting until I step on the gas and turn the key. Then it starts right up but shakes a tiny bit for about 30 seconds. Could this be in any way related, or just a coincidence that I just noticed because I have not been driving my truck recently?
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Old 12-05-2010, 07:44 AM
wvgranger wvgranger is offline
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Default Re: Overheating on short drives

Make sure you plugged the IAC harness back in or other that you may have unplugged.
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