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I had the heater core replaced 1 year ago. Just recently, the system was flushed and the thermostat was replaced. Engine temp looks OK, per gauge. Problem persists. Switching from hot to cold does change the air temp so I "think" the blend door is working.
Any new developments or ideas?
The other problem I'm having is that once the temp gets into operating range, it will all of the sudden shoot to hot and the engine will lose power. If you are at cruising speeds of +50, it will click back down after about 20 seconds, but if you are city driving, it won't click off until shut the truck down and wait 10 minutes.
I just had the freeze plug changed out and replaced the overflow reservoir - all to no help.
sorry i dont have his link to give to you but all I did was a search for it and he came up.
Ok I found it..it is www.heatertreater.net
Your problem could be due to a number of things. Have you considered replacing the heater core?
tidester, host
SUVs and Smart Shopper
I have very similar problem:
1998 Ford Expedition 4WD, 4.6L Engine EFI-SOHC, V-8
Heater blows hot air for a short time then air turns cooler.
Has front and rear climate control, same problem front and rear
Engine does not seem to get to operating temp range. Temp guage gets about 1/4 the way, I have a non-contact infrared thermometer and constantly check the engine temp near the coolant temp sensor and it barely gets over 170 degrees.
No signs of heater core leaks. With engine warm hose to heater core 135-140 degrees and hose out about 120-125 degrees.
Have removed center console; can view Blend door actuator motor shaft move (seems like 180 degrees) when moving temp control from full cold to full warm
Normal coolant system flushed
Heater cores not flushed independently
New coolant temp sending unit
3-New thermostats
A/C works great front and rear
I have replaced the thermostat and then my radiator thinking it may be clogged. My blend door actuator is working fine despite what my mechanic told me. I have no heat in either front or back. I'm replacing the water pump next. I have no evidence that either heater core is bad. I have two children that are freezing (using blankets to stay warm). HELP PLEASE
My heater hoses come out from behind the engine and then go to a tee (line through firewall to front core and another line going to the rear.) I'm thinking both heater cores could be clogged because they share the lines. I plan to flush the front core & rear and the hose and hope it helps before I start replacing expensive parts.
I will let you know if it works. Open to your or anyones thoughts. I also plan to try and find a way to check the water pump efficiency without having to remove it because it's a PAIN!
Good luck!
I had looked into the DC type heaters. I figured with there output it wouldn't be worth it because we usually only need heat early in the morning here in Las Vegas, NV. It gets pretty cold in the early morning so I have an small shop blower hearter I run an extension cord from garage to the truck which really helps.
Thanks for the info.
Kevin
Thanks.
I was wondering if it might be the water pump. But wouldn't my engine run hot? If anything it runs pretty cold.