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99' Durango overheating #880610 12/15/10 09:42 AM 12/15/10 09:42 AM
Joined: Jan 2003 Posts: 17,918 Akron, Ohio ProSport OP I Live Here
ProSport OP I Live Here Joined: Jan 2003 Posts: 17,918 Akron, Ohio	Drove it home from work yesterday, heat worked fine. Run in the house for a minute, come back out and head to basketball practice. The heater starts blowing real cold air, I look at the temp gauge and it was at 230-240. Nursed it back home, for a few seconds it started blowing hot air and the temp went down, but immediately went back up and blew cold air again. I just put a new thermostat in a few weeks ago. Could the thermostat be sticking closed? Water pump going bad? This is a 5.2 litre V8 auto.

Re: 99' Durango overheating [Re: ProSport] #880611 12/15/10 10:53 AM 12/15/10 10:53 AM
Joined: Aug 2005 Posts: 11,543 chicagoland,usa B buildanother I Live Here
buildanother I Live Here B Joined: Aug 2005 Posts: 11,543 chicagoland,usa	Radiator full? Stupid question, I realize.

Re: 99' Durango overheating [Re: ProSport] #880612 12/15/10 11:57 AM 12/15/10 11:57 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: for a few seconds it started blowing hot air and the temp went down, but immediately went back up and blew cold air again. Not a WP & too fast 2 b a stat. Air blend door servo intermittently loosing it's vacuum or fire if the servo is electric. though I'm not grasping how the eng temp is changing that fast unless it's not the coolant but the coolant gauge that's losing its signal along w the blend door. Holler back when you find it. live every 24 hour block of time like it's your last day on earth

Re: 99' Durango overheating [Re: RapidRobert] #880613 12/15/10 12:01 PM 12/15/10 12:01 PM
Joined: Jan 2003 Posts: 21,080 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,080 Niles , Ohio	With no heat and high coolant temp Id say the stat might be bad.When I bought my 99 I drove about a mile to get gas.It was at 230 real quick.Just because the stat was new dont mean it cant be bad.Mine was the stat and the truck only had 18K on it when I got it.Rocky Chrysler Firepower

Re: 99' Durango overheating [Re: ProSport] #880614 12/15/10 12:03 PM 12/15/10 12:03 PM
Joined: Jun 2003 Posts: 21,458 It's a dry heat gtx6970 Too Many Posts
gtx6970 Too Many Posts Joined: Jun 2003 Posts: 21,458 It's a dry heat	high engine temps and lower heater output 99% of time = low on coolant +/or air in the system

Re: 99' Durango overheating [Re: gtx6970] #880615 12/15/10 12:10 PM 12/15/10 12:10 PM
Joined: Jan 2003 Posts: 8,941 Holly/MI D Dean_Kuzluzski master
Dean_Kuzluzski master D Joined: Jan 2003 Posts: 8,941 Holly/MI	Quote: high engine temps and lower heater output 99% of time = low on coolant +/or air in the system I agree. A perfect low coolant symptom right there. You HAVE checked the coolant level by now, right? R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04

Re: 99' Durango overheating [Re: ProSport] #880616 12/15/10 11:05 PM 12/15/10 11:05 PM
Joined: Jun 2008 Posts: 1,822 Colorado D denfireguy top fuel
denfireguy top fuel D Joined: Jun 2008 Posts: 1,822 Colorado	Quote: Drove it home from work yesterday, heat worked fine. Run in the house for a minute, come back out and head to basketball practice. The heater starts blowing real cold air, I look at the temp gauge and it was at 230-240. Nursed it back home, for a few seconds it started blowing hot air and the temp went down, but immediately went back up and blew cold air again. I just put a new thermostat in a few weeks ago. Could the thermostat be sticking closed? Water pump going bad? This is a 5.2 litre V8 auto. Do you have the optional rear heat? I had the coolant go low in my 2003. The rear heater core is higher that most of the coolant system. Air can accumulate in there and it is a b*@& to get out. The FSM has a procedure but it did not work on mine. This was with a 4.7 so it may not be the same problem. Craig 2014 Ram 1500 Laramie, 73 Cuda Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango Only previous Non-Mopar: Schwinn Tornado

Re: 99' Durango overheating [Re: denfireguy] #880617 12/16/10 12:01 AM 12/16/10 12:01 AM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	Agree its a classic sign of low coolant. When cool, pull the main radiator cap and add 50/50 as needed with the engine running. Then fill the reserve tank about 3/4 full and watch it. Look for leaks. They can be sneaky. A slow leak in the radiator core may never drip if it leaks when hot since the coolant evaporates. White deposits may be the only clue. Looks like you are in the "salt belt". The radiator on my 98 Neon died last year due to salt damage. For several months it had a slow leak with no drips. I just topped it off every month or so and couldn't find the leak. Then it let go like old faithful. "Radiators.com" fixed me up with a new radiator next day.

Re: 99' Durango overheating [Re: gtx6970] #880618 12/16/10 12:22 AM 12/16/10 12:22 AM
Joined: Jan 2003 Posts: 1,411 Tallmadge, Ohio P Paul_B pro stock
Paul_B pro stock P Joined: Jan 2003 Posts: 1,411 Tallmadge, Ohio	Quote: high engine temps and lower heater output 99% of time = low on coolant +/or air in the system

Re: 99' Durango overheating [Re: Paul_B] #880619 12/16/10 12:47 AM 12/16/10 12:47 AM
Joined: Jan 2003 Posts: 17,918 Akron, Ohio ProSport OP I Live Here
ProSport OP I Live Here Joined: Jan 2003 Posts: 17,918 Akron, Ohio	Coolant is topped off, I may just replace the thermostat again, and use my tool that sucks all the air out of the system before refilling it.

Re: 99' Durango overheating [Re: ProSport] #880620 12/16/10 11:51 AM 12/16/10 11:51 AM
Joined: Aug 2003 Posts: 95 Ohio L LABBINSKI member
LABBINSKI member L Joined: Aug 2003 Posts: 95 Ohio	There is a tool made called the airlift it pulls a vacuum on the cooling system and will also tell if it has any leaks as it won't draw down any vacuum this will pull any and all air from system then use the fill part to fill it I would definitely agree it is an air pocket and this tool is the only way to get out the air without jacking up vehicle front end and hoping it burps the air I would not change the thermostat as it is working because as it cools it is opening allowing coolant to flow threw and blow heat Brian

Re: 99' Durango overheating [Re: LABBINSKI] #880621 12/16/10 01:13 PM 12/16/10 01:13 PM
Joined: Jan 2005 Posts: 12,419 Kalispell Mt. H HotRodDave I Live Here
HotRodDave I Live Here H Joined: Jan 2005 Posts: 12,419 Kalispell Mt.	If you find the resovoir full but still have the same problem it is air in the system, you may want to replace the cap as it is probably not sealing the air out when it cools and is supposed to draw a vaccume to pull the coolant into the system. I am not causing global warming, I am just trying to hold off a impending Ice Age!

Re: 99' Durango overheating [Re: LABBINSKI] #880622 12/17/10 12:09 AM 12/17/10 12:09 AM
Joined: Jan 2003 Posts: 17,918 Akron, Ohio ProSport OP I Live Here
ProSport OP I Live Here Joined: Jan 2003 Posts: 17,918 Akron, Ohio	Quote: There is a tool made called the airlift it pulls a vacuum on the cooling system and will also tell if it has any leaks as it won't draw down any vacuum this will pull any and all air from system then use the fill part to fill it I would definitely agree it is an air pocket and this tool is the only way to get out the air without jacking up vehicle front end and hoping it burps the air I would not change the thermostat as it is working because as it cools it is opening allowing coolant to flow threw and blow heat Brian That's the tool that I have(Airlift). Looks like you guys were right, I thought the radiator was topped off but it wasn't for some reason. I had to put a full gallon in it, and when I let it run with the cap off it burped up some air bubbles eventually. I drove it all night and ran perfect. THANKS!!! 1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual

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