Having problems with your 1998 Dodge Dakota ?

Surging idle, low heat

\015 Good morning class. My 98 3.9 dakota sport 2wd has a few issues to get sorted out. Starting with the engine temperature. The gauge never goes but a hair over 130 degrees. When I have hooked up scan tool, the real time events shows about 144 degrees running. After 30 minutes of driving I can stick a finger in the radiator and its just warm....I would imagine that should be scolding hot?\012I tried flushing and back flushing the heater core, and that made no difference. I believe because the coolant just doesn't get hot. \012\012I have no engine codes. \012\012My other problem is a slight engine idling surge and I think it is idling high too;(1200rpm) I replaced the iac valve and throttle position sensor. When I removed the iac it was covered in so much gunk, I decided to take the throttle body off and clean it also. After all that it idles at 1000rpm now and still surges a little. \012Also gets terrible fuel economy 12.5mpg.\012\012I'm getting ready to replace the thermostat with a 195 I picked up from the dealer. The Haynes manual seems to think its something else because I have no check engine light codes. It has a new fan clutch, most likely a different junkyard radiator, different engine, possibly transmission too. \012\012The truck has been nothing but a can of worms after another. Ive read all over the Internet about no heat problems with possible solutions, but I haven't found one that quite fits the bill. \012\012I'm thinking the bad fuel economy may be because the engine never really warms up right. Maybe that could also be my no heat problem? I've seen several places that a new thermostat has been tried and still did not fix anything. Well, I have one so ill give it a try. Far as the engine surging, I think the only things left are the map sensor and air temperature sensor.\015 Posted / edited by AnonymousUser on : 20-11-2017

Answers :

I agree that your heat will affect your performance. I believe that the thermostat will be the fix. I have had 2 thermostats in a row to be bad. Also you need to be sure you purge the system of air. The highest point that the water flows is it. Another way is to have the radiator cap off and motor running it needs to be as warm as to allow the thermostat to open. Have your antifreeze in hand, with the motors RPM raising by your friend to where you see the level in the radiator going down start raising the level of antifreeze to the top. Don't allow him to stop with the rpm until you have put all the mix in as possible then put the cap on the radiator. If he lets off too soon you will have a surge of antifreeze shooting out of the spout like a geiser. LOL That should take the air out of your system.
Repair Help & Product Troubleshooting for 1998 Dodge Dakota

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