CentOS Insufficient space in download directory /var/cache/yum/base/packages

I was trying to yum install libpcap when I got

 Error Downloading Packages:  14:libpcap-0.9.4-15.el5.i386: Insufficient space in download directory /var/cache/yum/base/packages    * free   0     * needed 108 k

Here's output from df -h:

Filesystem            Size  Used Avail Use% Mounted on/dev/sda1              20G   19G     0 100% //dev/sda3             202G   38G  154G  20% /hometmpfs                 1.5G     0  1.5G   0% /dev/shm

And fdisk -l:

Disk /dev/sda: 250.0 GB, 250000000000 bytes255 heads, 63 sectors/track, 30394 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytes   Device Boot      Start         End      Blocks   Id  System/dev/sda1   *           1        2611    20972826   83  Linux/dev/sda2            2612        3251     5140800   82  Linux swap / Solaris/dev/sda3            3252       30394   218026147+  83  Linux

I have launched yum clean all with no success clearing up space.

Please advise. Thanks.