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Old 10-06-2012, 08:10 AM
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HEAT!!!

When I start my truck in the morning let it get to op. temp my heater is lke warm when I drive its hot if i stop at a light it gets cold again. Have never seen anything like this before can anyone help?
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Old 10-06-2012, 08:52 AM
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There are a few things that can cause this.
1. Is your coolant full at the proper level, air doesn't transfer heat as well as the coolant.
2. You may have restricted flow thru the heater core. Plugging of core; water valve not opening all the way.
3. Blend door issues.
4. Water pump issues; insufficient flow; cavitation etc.

Last edited by dannyboy950; 10-06-2012 at 08:56 AM.
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Old 10-06-2012, 09:43 AM
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Could also be a thermostat issue. Mine was doing the same thing. I changed the t-stat and it seemed to fix the issue.
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Old 10-06-2012, 10:05 AM
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I'll bet it's low on coolant...
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Old 10-06-2012, 12:40 PM
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Water pump.

Sent from my phone that somebody didn't help me get.
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Old 10-07-2012, 12:37 AM
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Ok sitting at an idle right now at full temp and its blowing cold air. As i am driving its to the pount of burning me up. It has never overheated and temp gauge does not change as i drive. Truck is completely stock just letting everyone know.
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Old 10-07-2012, 01:02 AM
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Quote:
Originally Posted by 04fording View Post
Ok sitting at an idle right now at full temp and its blowing cold air. As i am driving its to the pount of burning me up. It has never overheated and temp gauge does not change as i drive. Truck is completely stock just letting everyone know.
The stock temp gauge is just an idiot gauge. It doesn't really tell you anything. When my t-stat was stuck open my insight would read the coolant temp as about 175-210 depending on how hot it was outside. The gauge in the dash never moved. Now that I changed the t-stat she holds 190-194 all day no matter the temp. I had no need for heat before so I can't say if the heat was affected by the t-stat. They are only about 20 bucks, I would just change it. It's not that hard to do. I have had this issue on other cars and a new t-stat has fixed the problem in all of them.
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Old 10-07-2012, 01:23 PM
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Ok i'll start with the tstat and see if that will work cause its never low on coolant.
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Old 10-29-2012, 09:39 AM
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I'm guessing Water Pump too. I think I'm in the same boat. I noticed I'd lost rear heat a year or so ago now this year, I've had the fan kick on at times it shouldn't when it's not even that hot out (used to be only in 100* temps, towing, and grades would kick the fan on) and now that it's cooled off, the heater goes cold at idle but kicks right up as soon as I get the RPM's up whether driving or sitting. I checked and the read air actually warms a little at higher RPM too. The vac. valve is working so I'm leaning towards a water pump that's been getting worse over the last couple of years. It's 8.5 years old and has 103k miles so I guess it's time for things like that to start going.
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Old 11-01-2012, 07:05 PM
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