Question about 1991 Dodge Caravan

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I am having alot of heater problems.I just flushed the heater core out but still no hot hair its warm but not hot

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  • sylus_smith Jan 31, 2010

    it gets warmer not much we did the flushing out till the water was clear. then if there were a blockage were eles could it be if stuck in the core? and is there an easyer way to get that taken care of. that is a mess under there. well i thank you for helping me with this i will have to try this out

  • sylus_smith Jan 31, 2010

    ok i think i got the heater took care of thanks but i have another problem with my transmission it seams to run realy well when it is cold no matter how long i run it but it still has to be runing from the 1st time i started it if i stop and start it it will not shift in to over drive what is the deal with that?

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  • Dodge Master
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How do the hoses going into the firewall on engine side under hood feel ? They should be reasonably same temperature. If one is hot, and other is quite a bit cooler, then you may have blockage still in core. If they feel close to same (hot) then blend/air door may be stuck. Can you hear things moving under dash when switched from cold to hot, and hot to cold? Does the air coming out get hotter if you rev engine a little and hold it there?

Posted on Jan 31, 2010

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  • Mike Butler
    Mike Butler Jan 31, 2010

    Clear water doesn't necessarily tell you core is clean, as there could still be a fair bit of calcium build up in there. It's how much flow you have that will determine how much heat you get. That's the reason for feeling the hoses when engine is warmed up and heater is on. You did run that engine from cold for quite a while with rad cap off and heater on once you started to refill the system with coolant didn't you? Those things need to be bled real well. I usually let it run with heater on, and cap off, until rad fan kicks on and off 2 or 3 times to make sure all air is out of that heater core before I put rad cap back on. Have a look at this tip I posted a while ago, it may shed some light. If anything else I can do, let me know.

    http://www.fixya.com/cars/r3698796-unclo...


  • Mike Butler
    Mike Butler Feb 01, 2010

    With the transmission problem, it might be real smart to have a good technician put a scan tool on it ( go to dealer if necessary) , and see if any codes are there. It almost sounds like a problem with the lock-up converter, which may only be a bad connection or switch acting up, but with these transmissions now, it's usually better to have a proper diagnosis done, which will likely save money in the long run. If you don't feel good about what they say, a second opinion from a transmission place or someone you trust who can diagnose it properly is always a good thing as well. The next thing I'd do is to change fluid and filter, if it hasn't been done in a while and make sure you only use Mopar ATF4. It cost a little more, but has new additives and other properties designed to work better with Chrysler transmissions. You may want to try fluid and filter first, to see if it helps correct the problem, that's up to you. Good Luck, keep me posted of results will you? What did you find was wrong with heater?

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