1990 Dodge Caravan - Answered Questions & Fixed issues

cooling fan relay is under radiator drivers side frame rail, square flat relay with 3 wires going to it is hard to see

Read the trouble codes. Otherwise you're flying blind

You may have a collapsed rubber brake line at the rear axle holding pressure in the line . Have your brake lines ever been replaced? At this age it would be a good idea to do anyway to avoid any other issues .

You can go on line and try google engine ID or call the parts department at the dealer and give them the ID and they can tell you.

What are you jumping across to make it work? It's probably the wiring coming to the relay instead of the relay itself

cycle key, on,off,on,off,on & leave it on (not start) & count flashes from check engine light to see if getting any trouble codes. example: 2 flashes, pause, 2 more, is code 22. 3 flashes,pause & 3 more, is code 33, etc.. let us know what you get, if any. P.S. Code 55 - 5 flashes,pause 5 more, is end of message.

Might be as simple as a small vacuum leak. Check any hoses on the engine that you can see for obvious signs of cracking.

Either something is draining power from the battery with the key off, or the battery has an internal short. Have you checked to see which problem exists by leaving the battery disconnected overnight ?

in the under hood relay box.

Some Dodges don't have inertia switches.. They have a shutdown relay that senses when an engine has stopped and shuts off the pump. It is a relay somewhere by the passenger side strut tower in the engine compartment near the distribution box. You cannot reset it. It must be replaced if it goes bad.

Assuming the radiator is full of coolant, and the engine is reaching normal temp of 190 degrees, you could have a blocked heater core or the temp control valve may not be working on the heater hose.I would check to see if both heater hoses are getting hot.

When a transmission slips --you don'tchange the fluid,it will slip worseTime for a rebuildToo old to keepDonate to Veterans & take $500 Federal Tax Deduction

i think this transmission has an electric solenoid pack on it. if this solenoid pack malfunctions it can create a no shift condition.

Possible bad cold start valve or the sensor that tells the valve to activate when cold. Start by replacing the cold start valve first.

You are going to take it back to the shop that replaced the pump, right ? ?

If u haven't done a service on the tranny then u need to.... If u have then u have a restriction. In your flow somewhere... These are just thoughts..... Not a tranny expert but seems like flow is slow till the fluid heats up and Thomas out

Hello! could you clarify one point for me before I offer a solution...Have you dropped in a different engine? The largest V6 in 1990 was a 3.3L...Perhaps it is just a typo but the 3.8L was not an option until 1994...You have it as a 3.9L...It's important in order to answer correctly...Send a comment...I am working on the fault which appears to be a missing air pump belt...Saailer I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

It's very likely your fuel pump has failed. Have somebody thump on the fuel tank while you're cranking the engine and see if it starts. If it does, replace the fuel pump. Otherwise get your fuel pressure checked, and check for spark. If no spark, check to make sure the distributor is turning(if applicable) If a 3.3 motor with no spark, suspect the crank sensor or cam sensor. Crank sensor is much easier to replace if experimenting.

starter could be bad

The idle air control is not operating correctly, on top of the intake you should see a hose nipple with a black plug, pull it off start the car it will then idle and put it back on, If it suddenly stalls, you will need to clean the throttle body and idle air control.and youll be back on the road in no time