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Have your battery tested. If the fans ran all morning, too cool down your van it probably killed the battery. Also keep an eye on your temp gauge, and make sure it's not overheating. The temp sensor for the fans could also be faulty ; causing them to run longer than they should when you turn the van off.
ive run into this problem a few times and it also drove me out of my mind,one of the few i worked on was a control module,cold it was okay then when warm it would die when ever it felt like then start when cold, the other few ended up having bad computers, yes the computer its about 80.00 rebulit, try the computer frist, hope this is helpful let me now the results.
Sounds like a flakey connector - try hunting down all the connectors you can find under the bonnet. Separate them, spray with WD40 and reconnect. Start at the engine management computer (silver block with fins on and lots of wires coming out). Take great care not to bend pins.
Does it have RADIO Controls on Steering Wheel? If so does the Air bag light EVER come on While Driving down the road. If no to these Questions.
I dont like at all being the Bearer of BAD news
I am Not Exactly A "RADIO" Expert But I have seen this Before and My Repair for it was Replacement.It is My Thought and Thery that somehow the MEMORY Cuircit gets Burned out adn in turn the On Off Cuircit is also Effected by this, Hoping this is of Good Help to you., RejakWilson
Previa heaters are usually ultra-reliable.
So, regarding your question, the only reason for the temp gauge to drop down with the heater on is the thermostat is sticking open, or you have a lower than recommended thermostat installed. The factory thermostat is a 192 degree F/89 degrees C stat. Down your way, a lot of the parts places vend the "summer" thermostats, and I suspect that this is your problem.
Look to see what the temp degrees that are printed on the stat. Should be 192 F or 89 C. The "summer" stats are 185 F/ 85 C. Also, make sure that your stat has a small "wiggle valve", some aftermarket stats do not have this. Very important. Install the stat with the "wiggle valve" pointing straight up/12 o'clock...
Regarding your trans dropping out od OD, this is because the coolant temp is dropping below 172 degrees F. This is the threshold for the OD to engage. Below 172/no OD engagement.
Hi, I have a 2.0HDI Expert which was doing the exact same thing as yours, blowing thick black smoke, sluggish and loss of power on gradients, a hissing sound and surging. I replaced the air flow meter but that didn't help. I was told to replace the turbo but a turbo expoert told me not to as it would blow white smoke if it was faulty. I was then told to replace the injectors but a diagnostic test showed them to be functioning fine. I was then told to look at the intercooler which had thick sludge at the lower left pipe. I replaced it today - Sunday 12th July and it is now driving like a new van. It now pulls me up gradients with ease in 4th and 5th instead of having to drop gear to get to the top. I got a replacement from Euro Car Parts for £147 inc VAT. To tell if this is your problem, look through the gaps in the lower section of the bumper at what looks like the radiator and look for sludge over the inside of the bumper and all over the pipe where it joins the back of the radiator (intercooler). Also open the bonnet and look down behind the grille for the same sludge. Hope this sorts it for you. Barry, Newtownards, Northern Ireland.