I'm trying to figure out why my 1998 Mercury Sable GS runs hot at times (especially at times when I have noticed I have ran the AC in the car on high). At times when it has ran hot there has been coolant/antifreeze in the radiator. I have bought a new thermostat and put it in (and when we suspected a small pin point leak that might have been in the hose I went out and bought and put in some liquid "stop leak") Six days later the car still ran hot. I noticed that when it has ran hot these last two times that some pressure was built up somewhere to the point where the antifreeze just boiled up and overflowed straight up out the antifreeze container. The guy I had to look at my radiator hose said it got good water flow in it and we did not see any outside leaks on the outside ground from the car, so after all my efforts I can not figure why it randomly run hot at times. I live in Arlington Texas where it get really hot, but the last time it ran hot was at night after I made a fifteen minute trip from my house. Any clue to why this car randomly runs hot?
Country: United StatesMake: MercuryModel: SableYear: 1998Engine: V6
Replacing the thermostat and trying the stop leak liquid (just in case there was a hole in the radiator hose, although there is no leak detected on the outside of the car)50/50 antifreeze is also kept in the radiator
Hello and welcome to JA, we had many problems with clogged heater cores with the 1996 to 1999 Taurus and Sables...remove both heater hoses from the heater core and run a garden hose through the heater core...see if there is any flow...you may wind up seeing alot of black debris flowing out, or the flow may be very slow...if either of these , then replace the heater core. Very common problem.
You basically mentioned flushing the heater core in doing this will this guarantee that the car won't run hot again, without necessarily having to buy a new heater core(and also since you mentioned heater core is this what allows your heat to flow through your car? Cause also my heat doesn't work in my car but the A/C works even when the nob is turned on the heat side (where heat is supposed to come out when turned to the heat setting)
I didnt say that, I said if there is debris or low flow to replace the heater core...and then yes, it is just about guaranteed. As for the A/C, when the temp knob is set to hot, it will stop the air from flowing across the evaporator core, which is what cools the air, so yes it will blow warm at that point. Mentioning that the heat is not working, just about assures me that the heater core is clogged, do what I suggested and you will know for sure.
Do you generally know how much a heater core costs for a 1998 mercury sable Gs V6 cylinder and how long it takes for a mechanic to install the new one (and what needs to be done if you had a personal mechanic do it himself?)
YOU CAN GET A HEATER CORE FROM ANY AUTO PARTS STORE FOR ABOUT $65, THE DASH NEEDS TO BE REMOVED IN ORDER TO ACCESS AND REPLACE IT THOUGH.