Little/no heat issue.

Little/no heat issue.

Postby Michael0413 [OP] » December 1st 2013, 2:12am

I have 2001 Astro van. I am getting little heat. Coolant is fine. I have replaced the thermostat, radiator cap, AC control modulator and the blower motor resistor (not related, fan speed issue). Heater core is 6 mos. old and I flushed the entire system clean. My next step I think is the heater control valve, no rear heat so it is the 4 port. Could also be the hot/cold actuator. Any opinions on this would be really appreciated. I am running out of things to try.
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Re: Little/no heat issue.

Postby RECox286 » December 1st 2013, 3:44am

Is the Heater Core getting warm at all ? It should be getting hot as the hinges if the Heater Control Valve is moving to the

open position, and the T-stat is working as advertised.

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Re: Little/no heat issue.

Postby redfury » December 1st 2013, 6:14am

possible that you hooked the heater control valve to a source of vacuum instead of a vacuum controlled source...meaning it's supposed to be connected to the lower hose coming from the firewall. The heater control valve is always open unless you apply vacuum to it, then it closes, Simply disconnecting it will ensure that the valve is open and allowing coolant to flow. That's the first thing I'd check. Beyond that, I'd say it's air in the system.
A temporary fix usually becomes a permanent solution, therefore it does not exist.
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Re: Little/no heat issue.

Postby Jasen » December 1st 2013, 6:18pm

An air bubble in the system? might need to jack up the front end and burp it.
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