Ford E-150 1998 van - no heat

MASTERPLUMBERPA

MEMBER
1998 FORD

My 1998 Ford E-150 conversion van with 95,000 miles on the 4.6L engine has no heat. I have already done a thorough flush and fill but still nothing. The radiator and heater core seem clean and no leaks. It has rear heat also and that seems to get slightly warmer than the ice cold air blowing from the front vents. Any suggestions on wether it's a switch or something. If so please include where I can find the problem switch. Thank you

Thursday, November 22nd, 2007 AT 10:06 AM

4 Replies

MIKE H R

MECHANIC
3,094 POSTS

When you have the temp switch turned up does it have any heat? You say the rear has little. When you turn it down does the air get colder? You did not say if tyou replaced the thermastat, if not change it.

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Thursday, November 22nd, 2007 AT 11:23 AM

MASTERPLUMBERPA

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Thank you for your reply. With the temp switch all the way up - no heat. The rear is slightly warmer than the front after running a long time (barely - almost like friction heat from air blowing through ducts to rear vents) the front blows such cold air that there is no change when I switch to cold air. I believe the t-stat was changed by garage, but will change it & see if there is any change. I'll let you know if it works.

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Sunday, November 25th, 2007 AT 12:03 PM

MASTERPLUMBERPA

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Mike
I changed the thermostat out but still no difference. With the current temperatures being in the 30� to 45� range, both front & back blow out ice cold air. I also changed the heater control valve that is located under the driver's side in the middle of front and back. There is also a vaccuum line on it that seems fine but it goes up into the van via the door channel and I lose where it goes from there. I'm stumped on what else to do. Please help!

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Monday, December 17th, 2007 AT 2:43 PM

MIKE H R

MECHANIC
3,094 POSTS

Sorry for the delay in answering, been away for a while. What does the temperasture guage say? Let the engine run and feel the hoses that go into the firwall for the front heater, see if they get warm. When you flushed the system did you flush it or back flush it?

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Monday, January 7th, 2008 AT 11:48 AM