My 2003 honda odyssey will only have heat when the fan is on high. The climate control doesn't work. How do I fix this?

John DeCosta

• 155 Answers
• Posted on Aug 15, 2009

SOURCE: 2002 Honda Odyssey fan only works at high speed. The A/C compress

Usually when the blower fan only operates on hi speed, its because of a failed blower motor resistor. You still have hi speed because on hi, the power going to the blower motor goes directly to it, as opposed to the lower speeds, when the power is routed through the resistor, thus lowering the voltage, which in turn lowers the speed of the fan. The resistor is usually located near the blower motor itself, under the hood back near the firewall.

SOURCE: my 2003 honda odyssey's headlight

Change the bulb, the low beams can burn out while the high beams still function.

SOURCE: 2002 Honda Odyssey fan only works at high speed. The A/C compressor also does not come on

If the fan only works on high speed I'd suspect a bad resistor in the fan circuit. On a new car it may be called by a different name but in essence does the same thing. It steps voltage down to the fan motor in all speeds but high. I'd check that first assuming there is no obstruction interfering with fan operation in all speeds but high overcomes that obstuction. I've seen mice among other things in a fan box on many occasions. I think the A/C problem is unrelated to your fan problem. This one may be a little harder to solve. The first thing to check is Freon level. The compressor won't cycle if the freon is low to avoid damage to the compressor. Do the fans, both under the hood come on when you turn on the A/C? If so it is more than likely just a Freon issue. If not take it to your local Honda Dealer.

SOURCE: my 2003 honda odyssey's headlight

I have a similar problem with a 2002 oddyssey. All fuses intact. Was able to switch both relays as relays running other working systems in car were same. No change in problem. Changed bulbs. no change in problem. Found that if I fidgeted with the control stick I could get the DRL's on. I suggest changing the headlight control stick.

Stephen

• 21873 Answers
• Posted on Dec 13, 2012

SOURCE: 2000 Honda Odyssey heating problem

Probably not going to be an easy fix.
Chances are based on your description the blend door under the dash has stuck open or closed. The blend doors are controlled by small electric motors and direct air thru the heater core and the vents. Most models have several doors.