1995 Plymouth Voyager-replaced thermostat - had system flushed - better but not great heat while driving or engine rpm at 1500 or better - very little heat at idle - when engine at normal operating temp, i can remove radiator cap with no back pressure and coolant is hot to touch - but can't see any coolant circulation in radiator - heater worked just fine last winter - do you have any suggestions on where my problem might be? any answers appreciated Thank You Bill Prichard
I had the same thing for two winters couldn't get good heat then the HEATER CONTROL VALVE, up near the master cylinder, cracked and started leaking. I replaced it this summer and now the heater is working like new.
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Check your thermostat. Put a meat thermometer in radiator start engine wait till top radiator hose gets hot it should be 180 or better if not replace. If it does get hot flush the heater core by disconnecting the two hoses and hook a garden hose to it and back flush it. If no heat now your doors are not working under the dash
After the car warms up feel the heater hoses that go into the fire wall from the motor both should be warm if only one is warm and the other is cool the heat valve that opens the flow of antifreeze to the heater core is not functioning locate the valve (either under dash in passenger compartment or in the egine compartment) it has a vacuum line going to it and it should have vacuum when the heat is on if not replace the vacuum line or valve itself. Back flush heater core and also be sure the level of antifreeze is up to the top low antifreeze will cause no heat to occur.
could be a cracked block engine.what i would do is put a tarp or old sheet down park vehicle on it and wait then when you check you can look on old sheet to see where its leaking and it will give you an idea where to look for the leek if it was head gasket youd have sludgey looking whitesh foam in the oil
are you using a 190 degree thermostat..do you have a faulty sending unit,also check the heater control valve,make sure you are putting the thermostat in correctly,dont mean to make you sound bad,some of these thermostats are funny
Maybe a little history of maintenance done recently would help, as well as what engine. Like has thermostat been changed, rad flushed, coolant level checked, is rad fan coming on when at normal operating temperature?
Try having heater core flushed and replace the heater control valve. As for the hesitation, that could be the 02 sensor needs to be replaced, or something may be clogged in the fuel system. my van is a 3.0. Had to replace fuel pump. Also when you've had work done like that the mechanic needs to reset computer, once that done it takes a while for it to run properly again. Hope this helps.
you need to get under the dash board and remove the passenger lower kick panel. ther will be a small motor bolted into the evaporator housing. remove it and manually move the blend door. if the heat gets hot the you need a blend door actuator.
Are the heater hoses warm or is just one of them warm? The reason i ask is because it looks like you've addressed everything but the heater core.It is possible that as a result of flushing the system that loose debris has clogged the passages to/of the heater core and would explain the loss of heat. hope this helps!