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Not really sure which forum this should go under but my 1993 Mark won't warm up. I put a new thermostat in it and the thing still won't get above the cold line on the tempature gauge. I just got it out of the shop and while I was driving it gave me heat for a little while and then just started blowing cold again. What could be the problem with this? I was wondering if you guys could help me out.
P.S It does have a little bit of a coolent leak as well.
Posted by: Frogman
Did you purge all of the air out of the system? Properly?
Posted by: mymark93
Don't know mechanic did it, he said that when he cranked it up to 90 it blew cold but when he left it at 72 it blew hot. So, he thought it might have something to do with the climate control module. That wouldn't keep it from warming up though.
Posted by: unity
I still think it was not burped right, if there is a lot of air in the crossover the coolant will not reach the sensor. In other words your over-heating and not knowing it. On occasion it will boil over, thus some heat. This is a bad thing.
The Gen II have an "anti-slosh" type thing that keeps the temp gauge from reacting fast so you wont see the boil overs.
Posted by: mymark93
So, all of a sudden it heated up and the heat has started to work. The temp gauge doesn't show it over-heating but I guess that doen not mean anything. How exactly to you get the air out of this line. Is it an involved task or fairly simple.
Posted by: unity
One, if you do have air dont rev it - the coolant will foam, thats bad. To check, uses a 1/4" socket wrench and open the crossover tube at the front center of the engine. Its that black tube thats front and center, you may have to remove the "beauty cover" if installed. This is the ONLY place to fill the system. The overfill tank is an expansion tank, not a fill location.
The cap should be easy to get off since the mechanic would have had to open it recently to fill. If its hard to get open and its easy to see it had not been in a while, find a new mechanic please! And do this when its cool, or open VERY slowly.
Once open, take a peak. If you see air that your problem. Fill with coolant/water mix. Please do not use tap water. Once filled, replace cap and tighten just a little, it does not need to be very tight at all. Drive around for a bit, try to find an bumpy road or corn field - joking about the corn field. Wait for it to cool a bit and reopen, remove any additional air.
After three times you should be good to go, but I recommend checking it again within 30 days. Some air-pockets can "break free" and work their way to the crossover tube.
Please let us know if you find air and if this help. If you dont find air we will have to look elsewhere!
