![]() At this time I found the vacuum line from the fuel pressure regulator was broken in 4+ places from being heat soaked over the years and brittle. I figured that potentially they could be contributing to the hard start and they were cheap (and likely original - van has just over 180,000 on it). I cleaned out the chamber for the IAC and put the new one in. The old IAC was all blacked up with a gooey tar like substance and noticeably worn in the cone. I changed out the temperature sender with a new BWD from Advance Auto and nothing changed. We also would have random hard starting issues. It continued this and this last summer we started getting the random over heating and actually getting boiling this time. When it went to off the RPM'* would go up, on the RPM'* would go down. Things were good for a few months and then the temperature gauge would randomly bounce up and down from completely off and sometimes up to fully over heating. I cleaned out the box, put in a new thermostat while I was at it since I figured it couldn't hurt because it was probably the original, and put in a new air filter. I only bring this up because it was like insulation on top of the ECU so I'm wondering if that may ultimately be the problem (over heated ECU) - more on why I'm thinking that in a minute. Although we had it for about 6 months before that without issue. We bought the car from a repo place and since it was sitting it was packed full by mice apparently. ![]() I pulled the air filter the next day to find the box was 98%+ full of cotton on the intake side of the filter with a hole about 4 inches around for the air to flow into the intake. It was a graduation party so after 5+ hours we left and didn't have the issue for the 60 mile trip home. We waited a while and went on to our destination a few miles away. I immediately pulled over and opened the hood to find no boiling whatsoever in the coolant bottle, no antifreeze smell, nothing. not this last one, the one before) we had a random overheat while driving on a 95+ degree day - according to the thermostat that is. I have a 2004 Pontiac Montana here in Michigan.Ģ summers ago (i.e. I have found good suggestions on here which didn't lead to a fix but you guys seem to know quite a bit so I thought I would post here and ask for advice. If you notice an oily surface in your coolant, immediately have your mechanic inspect your Montana for head gasket leakage.I've been searching all over the net and have found zero information on this one. Taking off the coolant reservoir cap on a warm engine could cause the cap to up explosively and fluid to spray out of the reservoir. See our video on how to add engine coolant for tips on adding coolant to your Montana.Īlways wear safety goggles when working on your Montana. If you need to add anti-freeze, be sure to check your owners manual to determine the correct type of coolant to add - in Pontiacs, it usually located in a section titled Fluid Capacities towards the end of your manual. ![]() The video above shows you where the coolant reservoir in your Montana is located and how to check the coolant / antifreeze level. Engine coolant / antifreeze circulates through your engine to keep it cool in the summer but won't freeze in the winter. In order to get an accurate reading, your 3.4 liter engine should be cool to the touch when you check it. Checking the engine coolant (also known as antifreeze) level in your 2001 Pontiac Montana is pretty easy. ![]()
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