Question about 1999 Mercury Cougar

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1985 cadillac fleetwood V8 4.1 blows cold air out but no heat

Brand new radiator and thermostat, gaskets etc. had everything working fine and drove more than 800km but one hose was worn and coolant leak from worn hose caused coolant to leak out and engine overheat while driving home. I replaced the hose and coolant, engine runs ok and return line heats up and overflow is functioning ok but still blows cold air inside the car. What should I check next? Thermostat, heater core? Not sure what to do next.

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  • Anonymous Mar 14, 2014


  • Anonymous Mar 14, 2014




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If you had heat before the problem than there is probably air still in the system . dont know your motor set-up , but it might have a bleed valve on the thermostat housing or a bypass line . if not , start the car and let it warm up the mean time take the upper radiator hose off @ the radiator . When it heats up to normal temp , the coolant should flow out of the hose . that will tell you that the thermostat is opening , and it will also get the air out of the system @ the same time . As soon as it starts to flow , hook the hose back up and tighten . refill the cooling system back to the full line , than check for heat
GM is bad about getting air trapped in the system .

Posted on Dec 03, 2008


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