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1984 Chrysler Lebaron Overheat

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  • #582006
    Jack KirkpatrickJack Kirkpatrick
    Participant

      So, here’s the deal. I have a 1984 Chrysler Lebaron, and basically everything works on it. But it has a strange issue. It overheats when the heat or the A/C is on. Before you say check the fan, I have. I also have bled the cooling system and the heater core does not leak. All that I can think of is either a grounding problem causing the digital dash/temp sensor to read wrong or a vacuum leak causing it to overheat. Please tell me what you think.
      Thanks.

    Viewing 15 replies - 1 through 15 (of 17 total)
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    • #582044
      college mancollege man
      Moderator

        Either you still have air trapped,Thermostat not opening, air flow/
        radiator restricted. here is a link to help.

        http://www.ericthecarguy.com/faq/what-to-do-when-your-engine-overheats

        #582045
        JamesJames
        Participant

          Well I had this very same car.lol On the EDIT: firewall is a orange box with a bolt in it and is the grounding plane for the interior of the vehicle as well as for the fuse box under the dash, it gets corroded often check that. Also check your thermostat, turn your car on see if it climbs up within 5-10 minutes to determine if its stuck open/closed. Check your water pump. Also something everyone NEVER does, check your stupid radiator cap, those things cause more over heating problems then the radiator its bloody self does.lol

          Im serious that cap is one of the most important parts under the hood no joke. Dont buy a cheap one either, spend the money buy a high quality cap if its bad itll save you many a head ache down the road.

          #583088
          Jack KirkpatrickJack Kirkpatrick
          Participant

            So the car doesn’t overheat besides when the heat/ac is on. It climbs up if the heat/ac is on and the car comes to a stop. The fan is on, and the compressor kicks in too. I think I may have a fan motor that’s not working too well because it climbs a little bit when it’s sitting in traffic, and it’s very stiff. Even if I start moving, the car still climbs up and eventually hits overheating for about 10 seconds and then goes back down and fluctuates around the 3/4th mark. When the heat/ac is turned off the temp restores to normal. Any suggestions?

            #583108
            college mancollege man
            Moderator

              The fan may not be spinning up to speed. Usually if you turn
              the heat on full blast it will help with the overheat.The compressor
              should not run in heat mode. Unless you are in defrost mode.

              #585331
              Jack KirkpatrickJack Kirkpatrick
              Participant

                So I put the cooling fan back in after oiling it…
                But it squeaks. I am going to take it out and check where the motor is rubbing.

                #585450
                EricTheCarGuy 1EricTheCarGuy
                Keymaster

                  If you’re overheating in traffic or when you put a load on the engine such as turning on the AC, it’s likely you have a flow problem. It could be airflow, or coolant flow. As pointed out it could be the water pump. If it’s corroded or broken, it will not move coolant like it should.

                  If you have obstructions between the condenser and radiator this can cause a restriction of airflow through the radiator. The radiator could also be clogged up internally. You might be able to find this with an infrared thermometer. If you find a ‘cold spot’ as you check the temp across the core, then you might have found a restriction in the radiator itself.

                  More info here: http://www.ericthecarguy.com/faq/what-to-do-when-your-engine-overheats

                  With a vehicle of that age, it could be any of these things. Come to think of it, there could also be restrictions in the block or cylinder head. In summary, I think you’re dealing with an airflow issue or coolant flow issue.

                  Keep us posted on what you find.

                  #585579
                  Jack KirkpatrickJack Kirkpatrick
                  Participant

                    So, the big idiot (me) put the screws in backwards to the motor. I fixed that and the motor is silent. The coolant was also half empty so I topped it off too. (don’t know why that was low)

                    I am going to verify it’s fixed tonight. Keep your eyes painfully glued to the screen to see if it’s fixed. :stick:

                    #585619
                    Jack KirkpatrickJack Kirkpatrick
                    Participant

                      Just got back. Seems that the fan is fixed. HORRAY!!!!!- Stop cheering.
                      The heater is causing a problem.
                      I turn it on, and after about a minute, the temp rises quickly. When we got in the garage and turned the car off, there was yellow green stuff on the floor. This never happens when we drive it and do not turn on the heater. After seeing the coolant almost empty and the puddle after the heater, I think the valve for the heater is leaking. I’ll check the coolant level tomorrow when the car is cold.

                      #585811
                      Jack KirkpatrickJack Kirkpatrick
                      Participant

                        Ok, drove it again today, and it works perfectly fine. I also checked and the coolant was lower. The coolant was under the heater valve, so yeah. Need a new one.

                        #586051
                        EricTheCarGuy 1EricTheCarGuy
                        Keymaster

                          Once you get the valve replaced and the coolant topped off, make sure you bleed the air out of the cooling system. This will prevent future issues. BTW, don’t worry that you don’t have a bleeder valve. Those are just there to make filling the system easier.

                          If you fix that and suspect other leaks.

                          Good luck and keep us updated.

                          #586208
                          Jack KirkpatrickJack Kirkpatrick
                          Participant

                            Haha, yeah I’ve done that before many a times on this car 😀
                            only 12 bucks for the valve, I love K-Cars.

                            #587223
                            Jack KirkpatrickJack Kirkpatrick
                            Participant

                              Alright, got a new heater valve from AutoZone, I’ll put it in on Saturday.

                              #587384
                              EricTheCarGuy 1EricTheCarGuy
                              Keymaster

                                Good luck and keep us posted.

                                #590746
                                Jack KirkpatrickJack Kirkpatrick
                                Participant

                                  New heater valve is in. I pressure tested the system and it seemed OK. It went down a few PSI within an hour. Haven’t had much time to test it yet.

                                  #590865
                                  Lorrin BarthLorrin Barth
                                  Participant

                                    [quote=”MyTechtime” post=92830]New heater valve is in. I pressure tested the system and it seemed OK. It went down a few PSI within an hour. Haven’t had much time to test it yet.[/quote]

                                    That change over an hour may be due to the engine cooling off. I pulled a car into my shop the other day and removed the radiator cap then turned on the shop heat. After tinkering on something else for awhile, I came back to find the radiator overflowing. This just from a little heat in the shop. Heat fluid and it expands, let it cool and it contracts.

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