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Car Forum / Chrysler Cars / October 2007LHS overheating
'94 LHS Twice today, going to and then coming back from a place about 70 miles away - car starts running hot, warning light on and temp needle all the way up until I'd gone about ten miles, then it drops back to normal and stays there the rest of the trip with no problems. Belts and coolant level look fine. I'm guessing that the thermostat is sticking shut, then opening up after a time, but I ain't no mechanic. ;-) Am I on the right track? Can I just tell the people at the Chrysler place to replace the thermostat?  Signature"Because all you of Earth are idiots!" ¯`·..·¯`·-> freemont <-·¯`·..·¯ > '94 LHS > [quoted text clipped - 9 lines] > Am I on the right track? Can I just tell the people at the Chrysler place > to replace the thermostat? If the vehicle only overheats when the vehicle is at a stop, in traffic or slow speeds you may want to check to see if the radiator fan comes on. Glenn Beasley Chrysler Tech >> '94 LHS >> [quoted text clipped - 13 lines] > If the vehicle only overheats when the vehicle is at a stop, in traffic or > slow speeds you may want to check to see if the radiator fan comes on. Thanks for the feedback. The car was started cold both times today. This is what happened: Start car, head down the road After several miles, car reaches operating temperature Car then gets hotter and hotter - passing normal temp (unusual) Car stays at hot temp for several miles Car then abruptly settles back down to normal temp Car stays at normal temp with no problems indefinitely thereafter It's not that it gets hot at stop signs, or anything like that. Signature"Because all you of Earth are idiots!" ¯`·..·¯`·-> freemont <-·¯`·..·¯ > >> '94 LHS > >> [quoted text clipped - 26 lines] > > It's not that it gets hot at stop signs, or anything like that. Was antifreeze recently changed? My Intrepid did the same thing and it started right after I changed a water pump that was leaking. It seems that letting the thermostat 'dry out' while the antifreeze was drained was a bad thing. I ended up replacing the thermostat. Also, if you had the antifreeze out, did you purge the air from the top of the block? (That's why there's a little bleeder on the top of the thermostat housing.) I guess if you didn't do the work, are you sure whoever did it was competent. > Was antifreeze recently changed? No, not in a long while. > I ended up replacing the thermostat. This is the plan. Thanks! Signature"Because all you of Earth are idiots!" ¯`·..·¯`·-> freemont <-·¯`·..·¯ The thermostat on that 3.5 engine is easy to get at and fairly cheap as well. Replace it and let us know if that does the trick. Assuming the temperature sensor and fan/relay are working properly, it sounds to me as though it is sticking closed and requires inordinate heat/pressure to open the first time. Bob >>> '94 LHS >>> [quoted text clipped - 31 lines] > > It's not that it gets hot at stop signs, or anything like that. > The thermostat on that 3.5 engine is easy to get at and fairly cheap as > well. Replace it and let us know if that does the trick. Assuming the > temperature sensor and fan/relay are working properly, it sounds to me as > though it is sticking closed and requires inordinate heat/pressure to open > the first time. Thank you - this is exactly what I suspected. I'm not a technician, but I have done minor repairs to cars when necessary. Is this thermostat job something that can be done with a couple of simple tools? No sealants or special gaskets or gunk or anything? I'm a guy who has replaced the starter, alternator, and other things on my 280ZX, so jobs of that nature don't worry me. But this LHS isn't so easy to work on. And where is the thing (thermostat)? Thanks again! Signature"Because all you of Earth are idiots!" ¯`·..·¯`·-> freemont <-·¯`·..·¯ The thermostat housing is held in place by two 13mm (If I recall correctly) bolts and has one gasket. From memory, I believe if you follow the upper radiator hose to the engine block, you will see the housing. Get the right thermostat and make sure you note the orientation and put it in the correct way! Scrape and wire brush off all the old gasket and retighten the bolts evenly. It is not a difficult or costly job. Good luck. Bob >> The thermostat on that 3.5 engine is easy to get at and fairly cheap as >> well. Replace it and let us know if that does the trick. Assuming the [quoted text clipped - 16 lines] > > Thanks again! > The thermostat housing is held in place by two 13mm (If I recall correctly) > bolts and has one gasket. From memory, I believe if you follow the upper > radiator hose to the engine block, you will see the housing. Get the right > thermostat and make sure you note the orientation and put it in the correct > way! Scrape and wire brush off all the old gasket and retighten the bolts > evenly. It is not a difficult or costly job. Good luck. Well I guess I got it on ok. I don't know if I got all the old gasket off, but all I had to scrape it off was a flathead screwdriver and I didn't want to scratch up the metal. I can't see any leaking, and after replenishing a little water I drove to the store and back with no overheating. I'll ask here if I see any problems. Thanks so much for the advice! Signature"Because all you of Earth are idiots!" ¯`·..·¯`·-> freemont <-·¯`·..·¯ >>The thermostat housing is held in place by two 13mm (If I recall correctly) >>bolts and has one gasket. From memory, I believe if you follow the upper [quoted text clipped - 10 lines] > > I'll ask here if I see any problems. Thanks so much for the advice! Don't forget to bleed the air out of the system! On the top of the T-stat housing there's a fitting that looks like a brake bleeder. Crack it open while pouring coolant into the reservoir, and close it when bubbles stop coming out with the stream of coolant. > Don't forget to bleed the air out of the system! On the top of the > T-stat housing there's a fitting that looks like a brake bleeder. Crack > it open while pouring coolant into the reservoir, and close it when > bubbles stop coming out with the stream of coolant. The car should be running when I do this, right? Hot or cold or doesn't matter? Signature"Because all you of Earth are idiots!" ¯`·..·¯`·-> freemont <-·¯`·..·¯ > >> '94 LHS > >> [quoted text clipped - 26 lines] > > It's not that it gets hot at stop signs, or anything like that. No coolant lost..... possible thermostat problem >> >> I'm guessing that the thermostat is sticking shut, then opening up >> >> after a time, but I ain't no mechanic. ;-) > possible thermostat problem heheh... thanks again, Glenn! I guess I'll just replace that sucker. Signature"Because all you of Earth are idiots!" ¯`·..·¯`·-> freemont <-·¯`·..·¯ |
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