overheating

[dwa175]

90 comn  had to replace radiator had big hole,i bought neww radiator from rock auto  brand new  mopar still on box,replaced  now it overheated   slowing I  have done all my old tricks but this will not give in   I have checked everything 3 times it slowly overheates    dam French   did the ever make anything that worked      any ideas    I will find problem but running out of time going to my home in florida for 6 months  hope to fix before I go   thanks dwa . :MJ 1: .

[AeroNautical]

     The Renix era (yours) MJs had a closed cooling system, so they had to be manually burped of air. To do so is tough, I got so fed up with trying to burp mine I just switched to open cooling. Ideally you'd want a vacuum kit that sucks all the air out of the system, and forces coolant in it's place. Without that, it's alot of trial and error, opening and closing the coolant bottle over and over until the air eventually leaves the system, and even then if your on a hill or something, not all that air will escape.

[Marine1Texas]

Burping on the renix seems easy for me, 2 ways to go.

1. burp thru temp sensor on rear left of engine.

2. raise front of truck up and burp it that way.

 

I have never had problems burping it in either of these ways.

 

Now if your still getting overheating 2 things to check.

1. make sure your water pump is pumping and the impellers are not broken.

2. make sure your thermostat is opening all the way and is not stuck.

 

Things else that could be causing overheating, Bad fan clutch, timing is off, or a head gasket leak....

[dwa175]

thanks did temp sensor it just doesn't want to give in,sometimes it just has get the air on its own I keep tring dwa note my wife whats me to install a plow don't think its a good idea but at lest it will be warn in cab.

[reubj]

I have a "closed" system. I installed one of those Prestone "Flush and Fill" tees in one of the heater hoses. Never a problem getting air out of the system.

[ParadiseMJ]

 I  have done all my old tricks but this will not give in   I have checked everything 3 times it slowly overheats   

 

What are all your old tricks?

 

Slowly overheats under what conditions?  Highway speed, traffic, crawling, idling, up a hill, towing?

 

...and the French aren't responsible for your whole truck...although they are rude.

[cruiser54]

Good points^^. More info is needed.

 

Keep in mind that a poorly sealing cap on the bottle will allow quick overheating. Use a Napa 703-1396 as a replacement.