specialkeay Posted December 5, 2010 Share Posted December 5, 2010 So I have a closed system radiator and my comanche is running cold. I changed the thermostat and nothing. The radiator lines arent pressurerized and I can take the cap off the coolant bottle and barley any pressure leaks out after its has been running for a while. , well its not like it used to be. So I fear thats its not building pressure in the system and that it could be a head gasket or a warpped head. The exhaust doesnt have any white in it though. I am going to change the thermostat again today just because its cheap and easy, and it will conferm its not that for sure. If any one has any theries please help, I live in New Hampshire and its getting cold. Quote Link to comment Share on other sites More sharing options...
jpdocdave Posted December 5, 2010 Share Posted December 5, 2010 well without a lot of information given on your vehicle, I'll tell you this. All of my renix jeeps seemed to run cool in the winter. I had one that I did everything to to make the cooling system proper, flushed, flushed heater core, new cap, new thermostats, then I even blocked the front of the radiator in winter, and after all that it ran at about 150 and I got ok heat. My mj now runs around 180 in the winter, but the heat works well and the small cab heats up way better than an xj, so I don't worry about. Also, weak compression can cause low operating temp. Quote Link to comment Share on other sites More sharing options...
specialkeay Posted December 5, 2010 Author Share Posted December 5, 2010 sorry its a 1989, 4.0. Quote Link to comment Share on other sites More sharing options...
jpdocdave Posted December 5, 2010 Share Posted December 5, 2010 ok, that's about what I was assuming. I also forgot to mention, too strong of antifreeze mix can also cause low temp. Quote Link to comment Share on other sites More sharing options...
glundblad Posted December 5, 2010 Share Posted December 5, 2010 I had the same problem until I figured out the temp gauge was off by 20%. Quote Link to comment Share on other sites More sharing options...
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