Overheating issue

Tiny
MARK4613
  • 1999 DODGE CARAVAN

Engine Cooling problem 6 cyl Front Wheel Drive Automatic 120, 00 miles

My van was overheating, I took it in and had my radiator flushed, it was bad they said, and thermostat changed, also had AC recharged. Everything is working, both cooling fans come on, but after a while with AC on, the temp starts to go up. Should the cooling fans turn in opposite directions? I noticed they do. What else could cause this overheat.

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Saturday, July 25th, 2009 AT 6:26 PM

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Tiny
DANAUTHIER
  • EXPERT
  • 155 POSTS

In your post you stated your coolant was very dirty,
have you had your coolant flushed on a regular basis prior to this problem? How many miles on are the van?
The fans sound like they are working properly. With everything you have had replaced there is not much left with your cooling system.
You said it over heats when you have the A/C on, does it happen as soon as you turn the A/C on, does it happen while you are drining or when you are at an idle? Are you loosing coolant? Do you notice a gurgling sound or is the coolant bubbling out of the coolant bottle?
Lots of questions I realize but each symptom leads to a different diagnosis. The most common problem with older caravans that cause over heating (with all you have already done) is the head gasket is leaking.
Let me know a little more and I will try to steer you in the right direction.

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Saturday, July 25th, 2009 AT 9:51 PM
Tiny
MARK4613
  • MEMBER

I just bought the van used a few months ago. It was overheating and I took it to a mechanic friend of mine.120,000 miles on it, I've only driven it for a day since the repairs, I had the AC on full, I live in AZ where it is 110, it took about 20 minutes for it to run hot, I turned off AC, turned on heat, gauge went back to normal, tomorrow I will drive it some more to narrow it down, I'll do highway with AC off, then on, then city driving. Could it need a new radiator? What would be other symptoms of a bad gasket? Prior to my repairs, I did have to add coolant about once a week, I don't think it was leaking, never saw any leak or on garage floor. I have tried to drive it as sparingly as possible to prevent any furthur damage. If it is the gasket, it is covered under the warranty I got from the used car lot. Thank you.

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Sunday, July 26th, 2009 AT 2:05 AM
Tiny
DANAUTHIER
  • EXPERT
  • 155 POSTS

If you were having to add coolant, it was going somewhere. Some loss id nornal over extended periods (6 months to a year) do to the water content of the coolant. Having to add coolant on a regular basis in the short period of time does indicate a problem.

Being in AZ is not really a concern in this diagnosis. The majority of vehicle produced by all major manufatures of automobiles are operated in warm temp areas, more concern is given to overheating that cold temps in automotive design.

You could have a plugged (bad) radiator like you ask, this is checked by checking the temp into and out of the radiator. Larger than normal temp between the inlet and output or the radiator. If it is hot before the rad and cooler after. If the radiator is getting hot, it is not the radiator.

Turning the A/C off and turning on the heat adds to the dissipation of heat from the engine. Again not a symptom, just an age old stop gap to try to cool an over heating engine while still trying to operate it.

As far as your extended warranty, read it carfully. Each contract is different, it should state clearly in the policy what is covered and what is not. It's kind of like buying health insurance for your car.

Hope this helps, let me know.
Let me know what you find out.

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Monday, July 27th, 2009 AT 9:27 PM
Tiny
MARK4613
  • MEMBER

I drove it yesterday, sat in driveway for 45 min, AC off, gauge stayed normal, drove city driving, AC off 30 min, normal, got on highway, again AC off, started to run hot within 2 miles, turned on heat, went to normal, got home, ran AC on full in driveway for 30 min, stayed normal, then revved up engine for minute or two, started to run hot.I have noticed that the coolant is not full anymore, should be completely full under radiator cap, right. Do not see any leaking, or any stains on my driveway. After I turn van off, I can hear, sounds like a boiling or gurgling sound coming from the engine I think, definitely not the radiator. Could it possibly be the water pump not 100%, does the water pump pump faster at higher rpms. They just flushed my radiator, but it still could have, say a permanent blockage? As far as the warranty, it says the gasket is covered as long as its not a result of overheating, but can't a bad gasket also cause overheating?

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Monday, July 27th, 2009 AT 9:52 PM
Tiny
FOOTBALLMOM
  • 1999 DODGE CARAVAN

Engine Cooling problem
1999 Dodge Caravan 6 cyl Two Wheel Drive Automatic 130000 miles

Hi -
We have been having issues with the van overheating. The check engine light went on a while ago got that checked out and was told it was the relay switch, replaced that didn't help. We have now replaced the temp. Sensor and the fuse. The van still over heats. The thermostat is only about a year old or so. We have had the fans checked and they do work they just for some reason will not turn on. The air conditioning will work but it makes the van get hot too fast so we don't dare run it. We can drive for hours and the van is fine, it is just when sitting for too long.
Any suggestions?

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Friday, May 26th, 2017 AT 7:00 PM (Merged)
Tiny
RASMATAZ
  • MEMBER

Could be the thermostat again, engine temperature sending unit/switch, fan relay, failing water pump and clogged radiator

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Friday, May 26th, 2017 AT 7:00 PM (Merged)
Tiny
FOOTBALLMOM
  • MEMBER

Thanks for your reply. I have called a few auto stores looking for the engine temp sending unit but no one has it for our van. Can you tell me where it is and what it does?

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Friday, May 26th, 2017 AT 7:00 PM (Merged)
Tiny
RASMATAZ
  • MEMBER

What liter engine is this? 3.0/3.3/3.8

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Friday, May 26th, 2017 AT 7:00 PM (Merged)
Tiny
FOOTBALLMOM
  • MEMBER

It's a 3.3
6 cylinder

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Friday, May 26th, 2017 AT 7:00 PM (Merged)
Tiny
RASMATAZ
  • MEMBER

Its next to the thermostat housing

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Friday, May 26th, 2017 AT 7:00 PM (Merged)
Tiny
PUMPER
  • 1999 DODGE CARAVAN

Engine Cooling problem 6 cyl Front Wheel Drive Automatic 158, 00 miles

I have a recurring problem with overheating, on & off. Mechanic says thermostat is OK. What gives?

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Friday, May 26th, 2017 AT 7:00 PM (Merged)
Tiny
DOCFIXIT
  • EXPERT
  • 19,005 POSTS

Cooling fans operating at time of overheating?

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Friday, May 26th, 2017 AT 7:00 PM (Merged)
Tiny
PUMPER
  • MEMBER

Yes, blower was on but not a/c

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Friday, May 26th, 2017 AT 7:00 PM (Merged)
Tiny
DOCFIXIT
  • EXPERT
  • 19,005 POSTS

Cooling fans underhood behind radiator

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Friday, May 26th, 2017 AT 7:00 PM (Merged)
Tiny
KOHLLINK
  • 1999 DODGE CARAVAN
  • 130,000 MILES

After the van warms up(about 2 miles) the temp gauge starts to get close to pegging the hot line. Replaced the thermostat and water pump. Still acting the same. I haven't seen any milky oil yet. Not blowing any white exhaust yet. I see some bubbles when the radiator cap is off when I'm checking the antifreeze. I guess my question is does head gasket sealers work?

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Friday, May 26th, 2017 AT 7:00 PM (Merged)
Tiny
JOHNSGARAGE99
  • MEMBER

O.K. First a few simple ideas. Have you cleaned the radiator out? Take the upper and lower hoses off and flush water thru the radiator. Then take a hose and flush thru the radiator to clear out bugs and road debris. You are using a 50/50 mix of good antifreeze? See if your local auto parts store has a cooling system pressure tester. Put that on where your radiator cap goes, start the van and watch the gauge as the van warms up.
If it climbs over 17 lbs you may have a head gasket issue.

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Friday, May 26th, 2017 AT 7:00 PM (Merged)
Tiny
FIXITMR
  • MEMBER

If pressure test fails head gasket sealer may fix it. Cheaper than engine dis-assembly.

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Friday, May 26th, 2017 AT 7:00 PM (Merged)
Tiny
KOHLLINK
  • MEMBER

Regrouped could this be a bad cooling fan relay? The fans work when in park or at a low rpm. Could fan speed be a problem at higher speeds with the a/c on?

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Friday, May 26th, 2017 AT 7:00 PM (Merged)
Tiny
FIXITMR
  • MEMBER

Fans need to be on high speed with air on.

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Friday, May 26th, 2017 AT 7:00 PM (Merged)
Tiny
KOHLLINK
  • MEMBER

Just took the van for a ride till it got hot. The radiator cap was not hot and the top hose was rock hard like the thermostat was closed. Could it be a bad thermostat? I replaced the thermostat. Might of gotten a defective one.

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Friday, May 26th, 2017 AT 7:00 PM (Merged)

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