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I have 87 ford escort diesel. I just replaced the thermostat and now when the car gets up to temp the heater will blow hot air like normal. But then a couple minutes go by and temp gage drops and the heater goes cold. Wait a couple more minutes and it repeats it's self. I am stumped.

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  • Cars & Trucks Master
  • 2,825 Answers

Sounds like the wrong thermostat. It's not opening and closing correctly.

Posted on May 07, 2014

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

theroadis
  • 81 Answers

SOURCE: coolant problem

Sounds like you might have an air pocket in the cooling system. This can develop, usually after a service, where the cooling system has to be opened to replace a water pump, thermostat, or other reason. When refilled, the air displaced by coolant has to go somewhere. In many cases, youll find that air is trapped in the highest place it can go...above the level of the radiator cap or overflow bottle. This can be a portion of the upper rad. hose, a heater hose, or a coolant line running thru various parts of the intake/throttle body area. What I do after topping up the system, is let the engine warm to normal op. temp./ W radiator cap still off. When upper hose becomes hot, you know thermostat is open. Now, if a bleeding device is not present, back off a hose clamp at the highest point in the system. Take a pair of pliers and twist the hose just enough to break the seal. You should see steam or drops escaping from your "breach". Once the steam stops and becomes all coolant, you have likely bled all air from the system. Top up radiator and coolant bottle to proper mark and close the system. (tighten your hose clamp) Check for leaks. Keep an eye on your system for a day or two, to insure no leaks are present.

Road

Caution! As with any task that involves opening the cooling system...Coolant and water can become very hot. Hot water and steam can be very dangerous. If you dont feel qualified to perform this task, let a mechanic do it!

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Posted on Feb 04, 2009

  • 5 Answers

SOURCE: ford mondeo mk3, intermitent dumping of water from

You may have an air pocket in your system which some times happens.  One way to get rid of it is to take the upper hose off on the engine side,  fill your system with water until it runs out from your engine block, replace the hose, start your car turn you heater on and set to hi keep the radiator cap loose until the temp start to rise then close tight.  Once the air pocket had been remover you can drain some of the water from the radiator using the lower drain plug and add antifreeze.   

Posted on Mar 09, 2009

  • 3 Answers

SOURCE: my 1994 acura legend keeps overheating

when bleeding the system to get the air out, you may want to turn of the heater to help get all the air out of the system.

Posted on Apr 27, 2009

REDOIL
  • 355 Answers

SOURCE: Ford F-350 7.3L overheating...

WELL IS YOU COOLANT LEVEL RIGHT AND IF SO WHEN TRUCK IS WARMING UP CHECK THE RAD HOSE'S AND SEE IF THE LOWER ONE IS GETING WARM ARE NOT OR IF THE TOP IS COLD BUT I WOULD START WITH THERMOSTAT IT'S SOUNDE LIKE IT IS COUSE FLOW ISUSSE HOPE THIS HELPS BUT IF BOTH HOSE ARE HOT AND YOU TOUCHE HEATER HOSE ONE HOT THE OTHER IS NOT THEN IT COULD BE HEATER CORE ISUSES

Posted on Oct 14, 2009

  • 4088 Answers

SOURCE: heater blows cold air. also, the temperature gage

Even 160 degree water should blow fairly warm air from the heater. Feel the heater hoses to see if they are hot--if so, then a bypass valve in the heater air-duct system may be in the wrong position--look for loose or damaged vacuum hoses. Check the defroster ports for hot air. Check to see if the temperature gauge drop coincides with the radiator fan coming on. If not, the thermostat may not be working correctly. Also, 160 degrees seems a little cool for a modern engine (check the thermostat).

Posted on Nov 12, 2009

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how old is the thermostat? are any hoses cracked or sucked together. heater core may need to be flushed or replaced? good luck!

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