I have a 92 F-150... the engine BARELY gets warm. Ford has replaced the thermostat three times and even put a warmer one in.. this didn't help. Additionally, the mileage on the truck dropped at the same time the truck quit warming up. It used to get to the mid-range of the temp guage... now it barely touches the normal line.

Any ideas would be much appreciated.

Thanks.

 

Sounds like you've got a major problem... try changing the heater core... You know that thing that is a pain in the *** to change...that could be it... then again you could have a very cold running engine...

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99' Ford F150 XL Sport
(Black) V-6 3.55 manual
Mods:
Airaid, Bosch +4 Plat.
Dynomax Ultraflow SI/DO
Color Keyed Carpet
AVS Headlight covers
AVS Bugdeflector II
Lund Wiper Cowl
Lund Tinted Glass
Lund Soft Bed Cover
V-tech Taillight covers

 

Could the temp gauge or sensor be broken in some way?

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Y2K F250 XLT SC 4x2 5.4L 5sp 4.10LS

 

try changing the temp sending unit, should be somewhere on the block.

There is probably a way to test the gauge, usually run a 12-volt line to one of the gauge terminals and it should go over all the way to the right, or some such. Get a shop manual, not just a ford offishal manual but a haynes and/or chiltons, should tell you how to do it.

Also, get a thermomter used for testing engine temps from a auto parts store, hardware store, kitchen store, kmart, walmart, someplace like that, costs about 10 bucks. (like a meat thermomoter your mom used(s) on thanksgiving). Open the rad cap when cool, put it in so it wont fall into the rad and run the engine unitl the thermostat opens (you can tell) and record the temp. I dont know about your engine but it should be between 180-195 degrees.

--karl

 

Is it possible something is causing the thermostats to stick open? That'll do it! Is the truck stock? Any previous owners? Any other related problems?

How often was the cooling system flushed?

Are you absolutely SURE the correct thermostat has been install? They are usually stamped with the temp range. Is the radiator the original? If replaced, is it hte right size?

Stock water pump? Water pump running to fast could do it?

Lotta factors here!

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Rand

98 Ford Expedition 4X4 XLT
5.4, 3.73s, 17" wheels,
Homemade 3" "COLD" Air-Box
mod, SuperChip, Amsoil
everywhere but tranny, Perma-
Cool combo 6 pass trans/oil
cooler (FQR 5.4 @ 50K)



[This message has been edited by Rand (edited 12-04-2000).]

 

Thanks for the replys... it is bone stock... the thermostat has been replaced by Ford so I would hope that they put the right one in... at least once in the three times they have done that. Good suggestion about the sending unit and getting the temp of the coolant.

Thanks.