2000 Concorde LXI overheating - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
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post #1 of 27 (permalink) Old 05-28-2019, 01:00 AM Thread Starter
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2000 Concorde LXI overheating

I have a 2000 Concorde LXI that overheats in either slow traffic (about 10 mph) or while at a drive-thru at a restaurant. Last time it happened the needle went to 3/4 mark on the gauge. I've been turning on the heat to cool the engine down and brings the needle to about the half way mark.

Suggestions to determine the cause of the overheating?
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post #2 of 27 (permalink) Old 05-28-2019, 06:50 AM
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Do the cooling fans turn on?
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post #3 of 27 (permalink) Old 05-28-2019, 07:16 PM Thread Starter
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I started car and it was not overheating and both fans turned on, so does that mean both fans should turn on when car overheating?


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Do the cooling fans turn on?
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post #4 of 27 (permalink) Old 05-28-2019, 07:31 PM
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Well, this is exactly what mine did when my a/c pressure transducer was shorting out. My a/c would turn off and so would the cooling fans, then car would overheat. If I turned the car off and turned it back on, the fans ran for a few seconds then turned off again.

I'd drive the car around the block a few times until it heats up and see if you can replicate it. When it overheats, see if the fans are on. If they're not then turn the car off and unplug the a/c pressure transducer and start it again. Fans should stay on.

If the fans are on and it is still overheating, might be water pump not circulating enough. Since your heater was working to cool the engine down, it seems there is enough flow so it may not be the issue. Seems like a fan issue to me.
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post #5 of 27 (permalink) Old 05-28-2019, 07:54 PM Thread Starter
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Where is the A/C transducer switch located?

How did you fix problem with your fans?


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Well, this is exactly what mine did when my a/c pressure transducer was shorting out. My a/c would turn off and so would the cooling fans, then car would overheat. If I turned the car off and turned it back on, the fans ran for a few seconds then turned off again.

I'd drive the car around the block a few times until it heats up and see if you can replicate it. When it overheats, see if the fans are on. If they're not then turn the car off and unplug the a/c pressure transducer and start it again. Fans should stay on.

If the fans are on and it is still overheating, might be water pump not circulating enough. Since your heater was working to cool the engine down, it seems there is enough flow so it may not be the issue. Seems like a fan issue to me.
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post #6 of 27 (permalink) Old 05-28-2019, 08:00 PM
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You need to confirm that both fans are running when the A/C is on and also when you're at normal operating temperature. They should both be on at the same time and both be at either low or high speed.

As stated above...when you're getting the overheat condition make sure both fans are running.
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post #7 of 27 (permalink) Old 05-28-2019, 10:18 PM Thread Starter
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I drove the car about 10 miles and when arrived home let the car idle about 10 minutes with A/C full on entire time and fans were running entire time but did not overheat...came within about 1/16" of halfway. I think because I did the test during the evening that the car did not overheat. Previous 2 times overheated was during the day when temperature in the 90's. I'll try again tomorrow afternoon.


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You need to confirm that both fans are running when the A/C is on and also when you're at normal operating temperature. They should both be on at the same time and both be at either low or high speed.

As stated above...when you're getting the overheat condition make sure both fans are running.

Last edited by eagle4x; 05-28-2019 at 10:25 PM.
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post #8 of 27 (permalink) Old 05-29-2019, 08:48 PM Thread Starter
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Today I drove the car another 10 miles (with A/C on full speed) when outside temperature was 93 degrees, when to a drive-thru at a restaurant and soon after temp gauge went between 1/2 and 3/4. I stopped at a gas station and only the passenger side fan was not working. I turned A/C off and still only passenger side fan not working. I turned on the heat and the temp gauge went to just below 1/2. When I stopped again 10 miles later I checked again (temp gauge just below 1/2) and still only passenger side fan not working.

Suggestions to repair either the fan or what's causing it not to run?


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Originally Posted by Ronbo View Post
You need to confirm that both fans are running when the A/C is on and also when you're at normal operating temperature. They should both be on at the same time and both be at either low or high speed.

As stated above...when you're getting the overheat condition make sure both fans are running.
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post #9 of 27 (permalink) Old 05-29-2019, 09:11 PM
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So both fans were working yesterday, and only one fan was working today?
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post #10 of 27 (permalink) Old 05-29-2019, 09:17 PM
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I'd replace the the fan shroud assembly. Your car is 19 years old with most likely the original. Less than $100 at RockAuto.com
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post #11 of 27 (permalink) Old 05-29-2019, 10:51 PM Thread Starter
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i could have been mistaken about yesterday. I just checked again with engine cold and passenger fan is still not working.



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So both fans were working yesterday, and only one fan was working today?
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post #12 of 27 (permalink) Old 05-30-2019, 12:44 AM Thread Starter
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Some troubleshooting I did:
1) Checked connection of wiring harness for passenger side and it was tight.

2) With car off, pushed on the passenger side blade and wouldn't move. Did same on driver's side and it moved freely.

3) With car on, pushed on passenger side blade with a long rod and it moved but with some difficulty (driver's side fan was running). It did not move nearly as freely as driver's side when car was off.

4) There are 2 relays for the fans, a HI and a HI/LO:
a) I removed the HI and HI/LO and put the HI in the HI/LO location and left the HI/LO out: passenger side fan not working, driver's fan working.
b) I removed the HI and HI/LO and put the HI/LO in the HI location and left the HI out: same result as above.
c) I switched the HI and HI/LO: same result as both of the above.

Therefore, this is likely a problem with the fans as Ronbo indicated.

From watching a video on how to replace the fans, with a little more work looks like the radiator can be replaced...any of you recommend going ahead and doing that?

Last edited by eagle4x; 05-30-2019 at 12:48 AM.
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post #13 of 27 (permalink) Old 05-30-2019, 05:55 AM
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Quote:
Originally Posted by eagle4x View Post
Some troubleshooting I did:
1) Checked connection of wiring harness for passenger side and it was tight.

2) With car off, pushed on the passenger side blade and wouldn't move. Did same on driver's side and it moved freely.

3) With car on, pushed on passenger side blade with a long rod and it moved but with some difficulty (driver's side fan was running). It did not move nearly as freely as driver's side when car was off.

4) There are 2 relays for the fans, a HI and a HI/LO:
a) I removed the HI and HI/LO and put the HI in the HI/LO location and left the HI/LO out: passenger side fan not working, driver's fan working.
b) I removed the HI and HI/LO and put the HI/LO in the HI location and left the HI out: same result as above.
c) I switched the HI and HI/LO: same result as both of the above.

Therefore, this is likely a problem with the fans as Ronbo indicated.

From watching a video on how to replace the fans, with a little more work looks like the radiator can be replaced...any of you recommend going ahead and doing that?
Be aware that when either fan relay is removed, the PCM senses the coil being out of the circuit and turns one or both (I forget which) fans on full time until you turn off and restart the engine. So any time you mess with those relays, either do it with ignition off, or cycle ignition back off and on before observing subsequent fan operation.

The plastic side tanks on the radiators get weak over time and have been known to suddenly split open, dumping all of your coolant and risking engine damage. On the other hand, there are some crap aftermarket radiators that develop leaks either right out of the box or after only a few days or weeks. So it’s a gamble either way. I would like to think that the aftermarket radiator manufacturers have cleaned up their act over the years (you’d think it would be more profitable to make them right rather than making a lot of warrantee replacements, and that the chain stores would push back hard from having to handle the returns and deal with seriously pissed off customers) but that may be wishful thinking.


'98 LXi - Later Concorde gages (black w/ chrome rings)/'99 LX - LHS gages (white) - HIR bulbs

Last edited by peva; 05-30-2019 at 08:34 PM.
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post #14 of 27 (permalink) Old 05-30-2019, 04:13 PM
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You fan motor has seized up. I had a spare motor I ripped off my old assembly but tossed it the other day... forgot if it was for passenger or driver side. Only one is really removable.

New set of fans are in order. I wouldn't bother replacing the radiator if it doesn't need it. The original ones were built way better than the aftermarket ones. Like peva said, I had one blow the side plastic open going down the highway. Few years on the one after that and no issues for now. Getting the fans on and off is pretty easy anyway.
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post #15 of 27 (permalink) Old 05-30-2019, 05:45 PM Thread Starter
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The web-site where I plan on purchasing the fans says "Dual Fans without Controller": What is a controller and where is it located?


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You fan motor has seized up. I had a spare motor I ripped off my old assembly but tossed it the other day... forgot if it was for passenger or driver side. Only one is really removable.

New set of fans are in order. I wouldn't bother replacing the radiator if it doesn't need it. The original ones were built way better than the aftermarket ones. Like peva said, I had one blow the side plastic open going down the highway. Few years on the one after that and no issues for now. Getting the fans on and off is pretty easy anyway.
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