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  #1  
Old 05-13-2010, 12:42 PM
BlackOps BlackOps is offline
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Default Temp problem?

After coming to normal running temperature....the gauge will show the temp spiking really hot..and then come back down to normal...then sometimes a little below normal. It will continue to do this bounce but now spikes and stays almost on red...then will drop down again to normal. Also after turning of the truck i hear a gugling sound and i popped the hood and it looks like air/coolant is being pushed into the reservoir. Help please. Would this just be the thermostat? The radiator was replaced last November as it was damaged.
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  #2  
Old 05-13-2010, 01:49 PM
DieHard4rd DieHard4rd is offline
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Default Re: Temp problem?

Sounds like the water/antifreeze mix is wrong & causing it to boil. I would drain & refill with new antifreeze/water 50/50 mix. See if that helps.
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Old 05-13-2010, 01:58 PM
DieHard4rd DieHard4rd is offline
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Default Re: Temp problem?

You can buy a cheap tester to check your coolant.
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  #4  
Old 05-13-2010, 02:14 PM
littleblue littleblue is offline
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Default Re: Temp problem?

Check to make sure your theromstat isn't failing and check that the radiator level is correct, don't rely on the level in the resevior. It sounds like you have air in the system, either from a leak or a mechanical issue.
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  #5  
Old 05-13-2010, 02:40 PM
FireRanger FireRanger is offline
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Default Re: Temp problem?

Just water should not boil at normal operating temperature. The cooling system is closed and will presurize as temperature increases. Increasing pressure will increase the boiling point. At about 12PSI (normal for warmed up engine), boiling point of plain water is about 240 degrees instead of your conventional 212 degrees.

If you are getting AIR pushing through the vent into the reservoir and temperature is making huge swings, then the problem here is quite obvious. Your coolant is critically low. Low coolant level means it can't cool properly and it can't pressurize. Lack of cooling makes the coolant hot and lack pressure lets it boil which pushes air/steam out the vent into the reservoir. The gurgling you hear is boiling coolant.

#1: Stop driving it.
#2: With the engine cold, open the radiator and fill it up with 50/50 water/antifreeze.
#3: Fill the reservoir tank halfway up with 50/50 water/antifreeze.
#4: Start the engine and let it warm up with the cap still off the radiator. As the engine warms up, it will start drawing in coolant from the reservoir. You will have to keep adding more 50/50 mix as it uses it up. Eventually it will level off. Put the cap back on and drive. After driving around and letting it cool off, open the cap WHEN ITS COLD and see if you need to add more.
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  #6  
Old 05-13-2010, 04:39 PM
BlackOps BlackOps is offline
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Default Re: Temp problem?

I filled up radiator, left cap off and had reservoir at 1/2 full. I turned truck on and as it ran the coolant level rose in the radiator and started to overflow so i turned the truck off. The level slowly went down and there were a few bubbles coming out of the radiator. I capped it and drove it around and on the highway...and it stayed at regular running temp the whole time. No bouncing. When I got home and cut it off I heard the same gargling noise and popped the hood and the reservoir was to the point of overflowing..and looked like it had. I just checked it again and the reservoir level is still very high.
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Old 05-13-2010, 05:22 PM
FireRanger FireRanger is offline
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Default Re: Temp problem?

Hmmmm. I'm going to cut and paste this from my reply in another similar thread.

It is one of two things.

(1) Radiator cap is shot. They are designed to hold back about 15psi. If there is more than 15PSI in the cooling system, the engine is overheating and the cap will release and vent into the reservoir tank. 12PSI is about normal in the cooling system at normal operating temperature. If the cap is not holding pressure and is just open venting into the tank all the time, the coolant will just boil and overflow.

(2) Head gasket is blown or the heads are warped. Pressure from the cylinders on the compression stroke is pushing into the cooling passages and over pressurizing the cooling system. Too much pressure opens the radiator cap vent and vents it into the reservoir tank.

#1 is cheap and easy at any auto part store. #2, you're screwed.
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  #8  
Old 05-14-2010, 05:09 AM
sgtsandman sgtsandman is offline
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Default Re: Temp problem?

I would look at the radiator cap first and hope it fixes the problem. If not, you need a new head gasket.
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  #9  
Old 07-06-2010, 07:17 AM
davidjsouth davidjsouth is offline
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Default Re: Temp problem?

BUMP!
Yesterday it reached almost 100 degres here in South Central PA. Today they're calling for the same.
Any how yesterday on my way to an appt my temp gauge started to spike. It stayed in the normal range but it seemed like it was too hot from what it normally sits at (Gauge may be slightly off). This morning during my AM route still hot but no sun yet of course it seemed to spike just once and then stay in normal range the whole time.

I'm hoping today on my way to work it doesn't give me any issues.
Could the fact that I had my radiator fluids flushed recently affect anything?
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  #10  
Old 07-06-2010, 08:51 AM
davidjsouth davidjsouth is offline
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Default Re: Temp problem?

Bump
Quote:
Originally Posted by davidjsouth View Post
bump!
Yesterday it reached almost 100 degres here in south central pa. Today they're calling for the same.
Any how yesterday on my way to an appt my temp gauge started to spike. It stayed in the normal range but it seemed like it was too hot from what it normally sits at (gauge may be slightly off). This morning during my am route still hot but no sun yet of course it seemed to spike just once and then stay in normal range the whole time.

I'm hoping today on my way to work it doesn't give me any issues.
Could the fact that i had my radiator fluids flushed recently affect anything?
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  #11  
Old 07-07-2010, 07:08 PM
FireRanger FireRanger is offline
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Default Re: Temp problem?

I wouldn't worry about it. My truck normally runs at about 190. The last few days of the heat wave, it has been running around 210-220.
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  #12  
Old 07-07-2010, 08:09 PM
davidjsouth davidjsouth is offline
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Default Re: Temp problem?

Quote:
Originally Posted by FireRanger View Post
I wouldn't worry about it. My truck normally runs at about 190. The last few days of the heat wave, it has been running around 210-220.
Okay. I'm still taking it in tomorrow. Mainly b/c when it reaches the 1/2 way mark my A/C quits blowing cold, well . . . cooler air.
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  #13  
Old 07-07-2010, 09:15 PM
98rangerxlt 98rangerxlt is offline
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Default Re: Temp problem?

Sounds like your Rad cap is bad or going bad.
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  #14  
Old 07-08-2010, 07:17 AM
FireRanger FireRanger is offline
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Default Re: Temp problem?

Quote:
Originally Posted by davidjsouth View Post
Okay. I'm still taking it in tomorrow. Mainly b/c when it reaches the 1/2 way mark my A/C quits blowing cold, well . . . cooler air.
You're saying when the engine temp gauge reaches around 1/2 way ("normal range"), the AC stops making cold air??? Try switching to MAX AC. I bet it will cool off again. If the blend door for the heater is broken (which happens a lot), it will fail to the full heat position. The air goes through the AC evaporator first then through the heater core so you'll get nothing but hot air no matter what.

If you put the thing to MAX AC, there is a valve the closes off the flow of hot coolant to the heater core. So even though the blend door is open to the heater core, there is no hot water so i won't make heat.
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How to: Aux light wiring, relays, & fuses
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  #15  
Old 07-08-2010, 08:16 AM
davidjsouth davidjsouth is offline
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Default Re: Temp problem?

They said they couldn't find anything. They asked if I had the thermostat changed out lately. I said I thought maybe when a new radiator got put in back in 08, but I wasn't sure. I'd have to check the paperwork. Ooops. I guess I emptied all that out not too long ago.
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