Question about 1994 Pontiac Grand Am
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Posted on Jan 02, 2017
I know that this is going to sound like of dumb but I would check and make sure your thermostat was installed the correct way. I had a similar issue once, after replacing the entire cooling system on a 750iL it still over heated, turned out I put in the thermostat the wrong way. Always check for little mistakes first:) Hope this helps and please don't forget to rate me.
Posted on May 21, 2009
rev the engine over 3 4000 rpm and look in the expansion botlles for clear aer bubles if yes head gasket is gone my one was and water missing inexplicable yes is going in the cilinders or oil sump chek dipstik for white foam or very steamy waterish exhaust in the bak of the car
Posted on Jul 09, 2009
yes some coolant sensors do, others just monitor the coolant temp,, the fan switch should be mounted on the radiator, " a plug with 2 electrical terminals on it " and can be tested by bridging the contacts with a pin and the fan should run if not the switch is at fault..
Posted on Nov 07, 2009
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easy way to check the fan on a Festiva is to pull the one connector off that connects by the thermostat housing. If you pull it the fan should come on and stay on. Until you are able to fix it you could just let the fan run like this. If it does not then you most likely need a new fan.
Posted on Nov 24, 2009
I don't remember ever seeing a Jeep that did not have an electric fan as a supplement to the mechanical one. The electric one should come on when the A/C is engaged. Jeep radiators are far smaller than they should be due to ground clearance issues. The only way to make them work is to enhance air flow through them by using electric fans. (or adding an extra row of cooling cores such as in the special tow package). When the vehicle is moving there is enough air flow created by that to eliminate the need for fans altogether, but you have to stop sometime!
Your a/c compressor adds to engine loading (why it pulls rpm down) When at idle with a/c on, the engine "thinks" it's going up-hill and produces more heat. The heat needs to be scrubbed from the system or it can and will overheat.
Make sure that the clutch fan is engaging. It spins free when cold but should lock up after it gets hot. Add an electric fan to the system...check with several scrapyards and see of any Jeeps like yours have one and take it.(some electric fans are on the drivers side and some are directly in front of the mechanical one) If equipped, there is wiring for it in the car. If necessary you can add one either inside or outside the radiator and operate it by way of a switch and relay or just a switch. (there are aftermarket ones that are "slim line) and are designed to fit between the radiator and the front grille) You could also add an external transmission cooler...in doing that, it will take some of the heat load off the radiator. Also make sure that the new radiator has the same number of core rows as the old one did....some shops mistakenly put ones with less cores in when replacing due to cost. In a system with a marginal design this can become critical. (most radiators come with one two three and even four rows)
Once the problem has been solved, don't forget to put the 195 t stat back in or the engine controls won't work properly.
Posted on May 18, 2010
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