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Re: replace radiator 81 6 cyl ford van
Drain the radiator, Remove the upper and lower radiator hoses, Disconnect the trans. cooler lines. These are "hard" lines connected to the radiator approx. 5/16 lines. Remove the mounting bolts of the shroud (if equipped) Remove the mounting bolts for the radiator and lift straight up. Installation is the reverse. Be sure to fill your radiator with a 50/50 mix of coolant to water. Start and run van and check for leaks.
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Your rear brake light switch might need replacing, you can get free advise from any mechanic about that... As for your heater,hows the radiators cooling system flowing and when was the last time you had it checked or serviced for a thorough clean flush. But first of all, check weather you need to top up with water to max level. The coolant level between min and max is concidered ok, but indicating a leak from 1 of the cooling system hoses, you need only to find and tighten the hose clamps .If the reservior level is below 1/2 way, It is recommended to service the radiators cooling system... replacing the thermostat would be an upgrade to elimanate a possibilty, which requires mechnical assistance and obviously as a last resort to have done... replacing any heater relays and blown fuses is a bonus but also a possiblity...a faulty heater tap causes heater problems. Again asking for free mechnical advise for this or some 1 else who can visually check that its working as you adjust the heater temprature switch while checking for leaks and rough operating sounds from the heater motor under the dash port ...checking faulty heater switchs...then theres taking the whole front dash port out to get at the heaters motor, which im sure you probably wont have to do as you mentioned that the fans are working.
Yes I've done it quite a few times....not fun. Take off mud guard underneath (Think they're T-25 tourqe bits). Then take off the 2 brackets They're supposed to be 8mm but sometimes you have to mushroom the bolt heads with a hammer and use a 7mm. Then you have to disconnect everything and unbolt the radiator from the condenser. Then take the radiator out by pulling it out the bottom and pushing the condenser up. Its been a couple years since I've done one but thats how i recall it. Ford made them very difficult. Good Luck ^_^
You are mis fireing on cyl 1 and 3 if you replaced plugs and wires and coil this is going to be a fuel injector issue or valve issue. See if you can swap the injectors with known good cyl. and see if it changes. Or have a shop do a fuel injector service on it to see if it helps. It may be to late for the fuel injector service.